Idlers & Tensioners
More informationAt the Global Parts automotive store, we offer a wide selection of original used car parts, including tension and idler pulleys for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen and others. The tension and idler pulleys we offer undergo quality control so that you can be sure that you are receiving a top-class product.
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Part no. 7810807-1
BMW E90 E91 LCI F10 F20 F30 N47N Diesel Mechanical Belt Tensioner
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 7790447-2
Belt Tensioner BMW E87 E90 E91 Diesel Alternator Pump 7790447
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-5%
Part no. A6512001870
Mercedes W906 OM651 Diesel Engine Belt Tensioner Drive Pulley A6512001870
Promo price
PLN 51.95
PLN 49.35
Delivery: Aug 12
If paid before 14:00
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Part no. 7838797
Belt Tensioner BMW X3 X5 E46 E60 E65 E53 M54 Water Pump Alternator 7838797
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-15%
Part no. A6112341039
Alternator Belt Tensioner Mercedes W906 Drive Pulley OM651 Diesel A6112341039
Promo price
PLN 75.95
PLN 64.56
Free delivery: Aug 12
If paid before 14:00
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Part no. A6112000570-1
Mercedes-Benz W163 W203 OM611 Engine Belt Drive Tensioner Pulley A6112000570
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. A2712000470
Belt Pulley Mercedes W204 M271 Engine Alternator Tensioner A2712000470
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PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. 059903133Q
Audi A6 4G A7 4G8 3.0 TDI Engine Auxiliary Belt Tensioner 059903133Q
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PLN 94.95
PLN 80.71
Free delivery: Aug 12
If paid before 14:00
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Part no. 8604266
BMW E90 LCI F30 N55 F80 M3 F82 M4 Belt Pulley Engine Tensioner S55 8604266
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. 038903315AN
Audi VW Seat Skoda Diesel Engines Auxiliary Belt Tensioner Pulley 038903315AN
Promo price
PLN 66.95
PLN 56.91
Free delivery: Aug 12
If paid before 14:00
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Part no. A6422001370-1
Mercedes W164 W204 W211 Engine Alternator Belt Pulley Tensioner A6422001370
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. A2712000270
Mercedes W203 Engine Belt Drive Tensioner Pulley A2712000270
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. A6071550535
Engine Belt Tensioner Mercedes W176 Drive Bracket Mount OM607 Diesel A6071550535
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PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. A2742001370
Mercedes W213 C238 C253 Engines Auxiliary Belt Tensioner Pulley A2742001370
Promo price
PLN 94.95
PLN 80.71
Free delivery: Aug 12
If paid before 14:00
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Part no. 7549873
Belt Pulley BMW F10 F90 M5 G11 G30 Engine Alternator Tensioner 7549873
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PLN 142.95
PLN 121.51
Free delivery: Aug 12
If paid before 14:00
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Part no. 7571015
BMW Mini Cooper One R55 R56 Engine Alternator Mechanical Belt Tensioner 7571015
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PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. A6512001370
Engine Belt Tensioner Mercedes W204 W212 Drive Pulley OM651 Diesel A6512001370
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PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. 6C1Q6A228BC
Ford Transit MK7 Diesel Belt Tensioner Pulley 6C1Q-6A228-BC
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. 03G903315D
Audi VW Seat Skoda Diesel Engines Auxiliary Belt Tensioner Pulley 03G903315D
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. 2067787
Ford Transit Mk8 Diesel Timing Belt Idler Pulley Crankshaft 2067787 GK2Q6K285AA
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PLN 94.95
PLN 90.20
Free delivery: Aug 12
If paid before 14:00
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Part no. A2712000470-1
Belt Pulley Mercedes W204 M271 Engine Alternator Tensioner A2712000470
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-15%
Part no. A2742001900
Mercedes C238 Engine Belt Drive Tensioner Pulley A2742001900
Promo price
PLN 66.95
PLN 56.91
Free delivery: Aug 12
If paid before 14:00
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Part no. 03D903305F-1
Volkswagen VW Polo 6R Belt Tensioner Engine Auxiliary Belt Pulley 03D903305F
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PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
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Part no. A6510150501
Mercedes W212 W204 W906 Camshaft Pulley Cover A6510150501
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PLN 61.95
PLN 58.85
Free delivery: Aug 12 – 13
If paid before 14:00
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Part no. 06B903133E
Audi A4 B7 1.8 T Petrol Belt Tensioner 06B903133E
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
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Part no. 06L903133D
Audi A3 8V TT FV 2.0 TFSI Engine Alternator Belt Tensioner Pulley 06L903133D
Promo price
PLN 61.95
PLN 58.85
Free delivery: Aug 12
If paid before 14:00
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Part no. 03C145299J
Volkswagen Touran 1T Engine Belt Tensioner Pulley Roller 03C145299J
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-15%
Part no. 8472172
BMW F40 G30 Diesel Mechanical Belt Tensioner 8472172
Promo price
PLN 142.95
PLN 121.51
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. A6072000070
Engine Belt Tensioner Mercedes W176 W246 Drive Pulley OM607 Diesel A6072000070
Promo price
PLN 47.95
PLN 45.55
Delivery: Aug 12
If paid before 14:00
-15%
Part no. A1122000970
Engine Belt Tensioner Mercedes W211 W220 Drive Pulley M112 Petrol A1122000970
Promo price
PLN 47.95
PLN 40.76
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 7810807-2
Belt Tensioner BMW E90 LCI F10 F20 F30 N47N Diesel Mechanical Tensioner 7810807
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-15%
Part no. 03L121032
VW Volkswagen Crafter 2E Engine Belt Tensioner Roller 03L121032
Promo price
PLN 256.95
PLN 218.41
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. A6112000570
Mercedes-Benz W163 W203 OM611 Engine Belt Drive Tensioner Pulley A6112000570
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 06L903133F
Audi VW Seat Skoda 2.0 Petrol Auxiliary Belt Tensioner Pulley 06L903133F
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-15%
Part no. A2742001270
Mercedes W212 274920 Engine Belt Drive Tensioner Pulley A2742001270
Promo price
PLN 118.95
PLN 101.11
Free delivery: Aug 12
If paid before 14:00
Part no. 06L903133F-1
Audi VW Seat Skoda 2.0 Petrol Auxiliary Belt Tensioner Pulley 06L903133F
PLN 46.95
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 06E903133H
Audi A4 A5 S4 B8 A6 C6 Petrol Engine Auxiliary Belt Tensioner 06E903133H
Promo price
PLN 142.95
PLN 135.80
Free delivery: Aug 12
If paid before 14:00
Part no. 059145174A-1
VW Touareg 7L Audi A6 C6 Q7 4L Drive Belt Tensioner Bracket Mount 059145174A
PLN 46.95
Delivery: Aug 12
If paid before 14:00
Part no. A2742000870
Mercedes W204 C207 W212 W205 W213 M274 Petrol Belt Tensioner A2742000870
PLN 161.95
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. 8579118
BMW F20 F21 LCI F40 Mechanical Belt Tensioner 8579118
Promo price
PLN 94.95
PLN 80.71
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 166030W010
Lexus LS400 Engine Belt Drive Tensioner Pulley 1UZ-FE 166030W010
Promo price
PLN 94.95
PLN 90.20
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 04L903315B
Audi A3 8V Engine Auxiliary Belt Tensioner Pulley Roller 04L903315B
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 06A903315F
Audi A3 8P 1.6 MPI BSE Petrol Auxiliary Drive Fan Belt Tensioner 06A903315F
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 022145299L
Audi A3 8P 3.2 BMJ Petrol Engine Belt Idler Pulley Tensioner 022145299C
Promo price
PLN 94.95
PLN 90.20
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. 06M903133J
Audi S4 B9 VW Touareg Petrol Engines Auxiliary Belt Tensioner Pulley 06M903133J
Promo price
PLN 189.95
PLN 161.46
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 038903315AE
VW Volkswagen New Beetle 1.9 TDI BSW Alternator Tensioner Adjuster 038903315AE
Promo price
PLN 61.95
PLN 58.85
Free delivery: Aug 12
If paid before 14:00
Part no. LR138382
Range Rover Sport L494 Belt Tensioner Idler 3.0D AJ20D6 LPLA-19A216-BA
PLN 232.95
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. 059903133J
Audi A7 4G 3.0 TDI Alternator Belt Tensioner Pulley 059903133J
Promo price
PLN 142.95
PLN 121.51
Free delivery: Aug 12
If paid before 14:00
Part no. 2431339
Ford Mondeo Mk5 Engine Belt Tensioner Drive Pulley Wheel CM5Q-19A216-AC
PLN 46.95
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 06H903133G
Audi A5 8T Engine Alternator Belt Tensioner Pulley 06H903133G
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 06H903341D
Audi A5 8T Deflection Guide Pulley V Ribbed Belt 06H903341D
Promo price
PLN 47.95
PLN 45.55
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 059145174A
Audi A6 C6 Q7 4L Drive Belt Tensioner Unit 059145174A
Promo price
PLN 75.95
PLN 72.15
Free delivery: Aug 12
If paid before 14:00
Part no. A2742001370-1
Mercedes W213 C238 C253 Engines Auxiliary Belt Tensioner Pulley A2742001370
PLN 46.95
Delivery: Aug 12
If paid before 14:00
-15%
Part no. 05C109244
Seat Ibiza Mk5 Engine Belt Guide Tensioner Pulley Roller 1.0 TSI 05C109244
Promo price
PLN 80.95
PLN 68.81
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 06J903133D
Skoda Octavia RS 1Z Engine Auxiliary Belt Tensioner Pulley 06J903133D
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
Part no. LR025083
Land Rover Range Rover L405 Drive Belt Pulley Idler BH42-19A216-FB LR025083
PLN 46.95
Delivery: Aug 12
If paid before 14:00
-15%
Part no. A2811550035
Smart C453 2019 FORTWO 52KW Auxilliary Belt Tensioner 117107055R
Promo price
PLN 94.95
PLN 80.71
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. A2812000170
Smart C453 2019 FORTWO 52KW Mk2 Belt Tensioner Pulley A2812000170
Promo price
PLN 94.95
PLN 80.71
Free delivery: Aug 12
If paid before 14:00
-40%
Part no. 057903133AF
Audi A6 C8 A7 4G Q7 4M Engine Auxiliary Belt Tensioner 3.0 TDI 057903133AF
Promo price
PLN 284.95
PLN 170.97
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 04L903315K
VW Golf Mk7 5G Engine Auxiliary Belt Tensioner Pulley Roller Diesel 04L903315D
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 06E903133D
Audi A4 B7 Alternator Belt Tensioner 3.2 FSI AUK BKH 06E903133D
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 022145299E
Volkswagen Touareg 7L Engine Belt Idler Pulley Tensioner 3.2 VR6 022145299E
Promo price
PLN 61.95
PLN 58.85
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 06E903133R
Audi A4 S4 B8 A5 S5 8T A6 S6 C7 Alternator Belt Tensioner 3.0 TFSI 06E903133R
Promo price
PLN 61.95
PLN 58.85
Free delivery: Aug 12
If paid before 14:00
-40%
Part no. 117507034R
Mercedes S205 Alternator Generator Belt Tensioner Pulley 117507034R
Promo price
PLN 189.95
PLN 113.97
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. 117109168R
Mercedes W415 Alternator Belt Tensioner Pulley Bracket OM608 117109168R
Promo price
PLN 237.95
PLN 202.26
Free delivery: Aug 12
If paid before 14:00
-40%
Part no. LR022809
Range Rover L405 Alternator Belt Tensioner Diesel Pump BH42-6B209-AA
Promo price
PLN 237.95
PLN 142.77
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. 2431347
Ford B-Max Auxiliary Fan Belt Tensioner Drive Belt CM5Q-6A228-BB
Promo price
PLN 61.95
PLN 52.66
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. 1765052
Ford Fiesta Mk7 Timing Cam Belt Drive Tensioner Pulley 1765052
Promo price
PLN 161.95
PLN 137.66
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. 8579118-1
BMW F20 F21 LCI F40 Mechanical Auxilliary Belt Tensioner 8579118
Promo price
PLN 75.95
PLN 64.56
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. A2742000470-1
Mercedes W204 C207 W212 W205 W213 M274 Petrol Belt Tensioner A2742000070
Promo price
PLN 75.95
PLN 72.15
Free delivery: Aug 12
If paid before 14:00
Part no. 059903341J
Volkswagen Touareg 7P Audi A4 B8 Q7 4L A5 8T A6 C6 Idler Pulley 059903341J
PLN 46.95
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 059903133J-1
Audi A7 4G 3.0 TDI Alternator Belt Tensioner Damper Mount Bracket 059903133J
Promo price
PLN 94.95
PLN 90.20
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. A6292000370-1
Mercedes W164 W211 Diesel OM629 Auxilary Belt Tensioner A6292000370
Promo price
PLN 61.95
PLN 58.85
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. A6292000470
Mercedes X164 W211 W221 Engine Oil Pump Pulley Wheel OM629 Diesel A6292000470
Promo price
PLN 61.95
PLN 58.85
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. 06J903133A
Audi A3 8P TT 8J Engine Auxiliary Belt Tensioner Pulley 1.8 2.0 TFSI 06J903133A
Promo price
PLN 56.95
PLN 48.41
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 06E903133Q
Audi S4 B8 S5 8F A5 8T Belt Tensioner Damper 06E903133Q
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 7835417-1
BMW E60 M5 E90 E91 E92 M3 Water Pump Belt Tensioner 7835417
Promo price
PLN 75.95
PLN 72.15
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. A6422000470
Mercedes W164 W221 W251 OM642 Engine Belt Drive Tensioner Pulley A6422000470
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 117501113R
Nissan Qashqai Pulley Juke Belt Tensioner 117501113R
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-15%
Part no. A6512340239
Mercedes W212 E300 BlueTEC Hybrid Engine Alternator Belt Tensioner A6512340239
Promo price
PLN 142.95
PLN 121.51
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. A2742000470
Mercedes W204 C207 W212 W205 W213 M274 Petrol Belt Tensioner A2742000070
Promo price
PLN 61.95
PLN 58.85
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 5751H6
Citroen Berlingo B9 Auxiliary Belt Tensioner Pulley 1.6 Diesel 5751H6
Promo price
PLN 61.95
PLN 58.85
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 55244469
Opel Combo D 1.3 CDTi Diesel Engine Auxiliary Belt Tensioner Pulley 55244469
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 03G903315
Audi VW Seat Skoda Diesel Engines Auxiliary Belt Tensioner Pulley 03G903315
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-5%
Part no. A0002021719
Mercedes W204 M271 Deflection Guide Pulley Belt Roller Drive Pulley A0002021719
Promo price
PLN 47.95
PLN 45.55
Delivery: Aug 12
If paid before 14:00
-5%
Part no. A6512000370
Mercedes W204 OM651 Deflection Guide Pulley Belt Roller Drive Pulley A6512000370
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-5%
Part no. A6422000570
Mercedes W164 OM642 Diesel Engine Belt Roller Drive Pulley A6422000570
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-15%
Part no. LR016139
Land Rover Range Sport L320 3.0 D Belt Tensioner Pulley LR016139
Promo price
PLN 161.95
PLN 137.66
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 7534398
Mini Cooper One R55 R56 Engine alternator mechanical belt tensioner 7534398
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-5%
Part no. A2702002100
Belt Pulley Mercedes W177 M260 Engine Alternator Tensioner A2702002100
Promo price
PLN 113.95
PLN 108.25
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. A6512002400
Engine Belt Tensioner Mercedes W176 W246 Drive Pulley OM651 Diesel A6512002400
Promo price
PLN 66.95
PLN 63.60
Free delivery: Aug 12
If paid before 14:00
-15%
Part no. 7835422
BMW E60 E61N M5 E63 E64 M6 E90 E92 E93 M3 Belt Tensioner 7835422
Promo price
PLN 113.95
PLN 96.86
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. A6422001370
Mercedes-Benz W164 W204 W211 Engine Alternator Tensioner Pulley A6422001370
Promo price
PLN 46.95
PLN 44.60
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 038903315AJ
Audi A1 Volkswagen Caddy Golf Tiguan Drive Belt Tensioner Unit 038903315AJ
Promo price
PLN 75.95
PLN 72.15
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 045903315A
VW Polo 9N Skoda Fabia 1.4 TDI Auxiliary Belt Pulley Tensioner 045903315A
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 038903315AH
VW Volkswagen Transporter T5 2.0 TDI CAAA Fan Belt Tensioner Unit 038903315AH
Promo price
PLN 43.95
PLN 41.75
Delivery: Aug 12
If paid before 14:00
-5%
Part no. 9X238A610AA
Jaguar XF250 Belt Tensioner Engine Auxiliary Belt Pulley Wheel 9X238A610AA
Promo price
PLN 42.95
PLN 40.80
Delivery: Aug 12
If paid before 14:00
-40%
Part no. 03G903315CZ
Volkswagen VW Golf V Engine Belt Tensioner Pulley Roller 2.0 TDI 03G903315CZ
Promo price
PLN 113.95
PLN 68.37
Free delivery: Aug 12
If paid before 14:00
-5%
Part no. 03C145299M
Volkswagen VW Touran 1T Engine Belt Tensioner Pulley Roller 03C145299M
Promo price
PLN 61.95
PLN 58.85
Free delivery: Aug 12
If paid before 14:00
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Belt tensioners and pulleys for reliable belt system performance
Reliable tensioners and pulleys for stable drivetrain operation
Tensioner and idler pulleys are essential components of the drive system that ensure the correct tension of V-belts and timing belts, enabling their efficient operation. Their role is crucial in maintaining the smooth performance of the engine and auxiliary systems, such as the alternator or pumps. In the Global Parts automotive store, you will find a wide selection of used car parts, including tensioner and idler pulleys, perfectly matched to brands such as BMW, Audi, Mercedes, Volkswagen, Mini, and others.
What functions do tensioner and idler pulleys perform?
Tensioner and idler pulleys perform key functions in a vehicle's drive systems:
- Maintaining proper tension – They ensure the correct tension of belts, which is essential for their effective operation.
- Minimizing vibrations – They stabilize belt operation, reducing noise and vibrations.
- Improving belt longevity – Through precise tensioning, they prevent excessive belt wear and slippage from the pulleys.
- Supporting auxiliary systems – The pulleys allow for the efficient operation of the alternator, power steering pump, or air conditioning. Used car parts, such as tensioner and idler pulleys, are an economical solution for maintaining the efficiency of drive systems.
Construction and purpose of tensioner and idler pulleys
Tensioner and idler pulleys are belt guidance elements mounted in the engine accessories or the timing system. A typical assembly consists of a roller, a bearing, and a mounting point, and depending on the version, also a tensioner arm or spring. Their task is to maintain the correct belt path and limit slippage during load changes. When selecting, it is worth comparing the OEM part number, roller diameter, track width, and mounting location.
Differences between types of tensioner and idler pulleys
| Component type | Main function | What to check before purchase |
|---|---|---|
| Tensioner pulley | Maintains proper belt tension during engine operation | OEM number, tensioner type, roller diameter, mounting method |
| Idler pulley | Guides the belt along the correct path and stabilizes its run | Track width, position in the system, engine version compatibility |
| Bearing assembly | Ensures smooth roller rotation and reduces noise | Bearing condition, operating clearance, manufacturer markings, belt compatibility |
Cooperating elements and signs of wear
The pulley bearing is the part responsible for the free rotation of the roller under belt load. A worn bearing usually shows signs such as humming, whistling, or uneven belt running, and over time can cause vibrations in the entire accessory drive. In practice, along with the pulley, it is worth checking the V-belts and ribbed belts as well as pulleys, as these components work in the same system and wear out together. If you are looking for a component such as a belt tensioner roller, you must compare not only the diameter but also the roller offset and mounting type.
Why is it worth taking care of tensioner and idler pulleys?
Well-maintained tensioner and idler pulleys are crucial for the efficiency and durability of drive systems. Typical problems include:
- Bearing wear – Damaged bearings can cause noise, excessive vibrations, and reduce system efficiency.
- Loosening of the tensioning mechanism – This can lead to improper belt tension and faster wear.
- Corrosion – Contaminants and moisture can damage the pulley surface, affecting their operation.
- Cracks or deformations – Mechanical damage can disrupt the operation of the drive system. If replacement is necessary, choose used car parts that ensure durability and precision of operation.
How to choose the right tensioner and idler pulleys?
- Matching the vehicle model – At Global Parts, you will find used tensioner and idler pulleys perfectly fitting BMW, Audi, Mercedes, Volkswagen, Mini, and others.
- Technical condition – Used pulleys should be free from mechanical damage, such as cracks or worn bearings.
- Material – Choose pulleys made of durable materials, such as steel or high-abrasion-resistant plastics.
- Belt compatibility – Ensure that the pulleys are adapted to the type of belts in your vehicle (V-belts, timing belts, etc.). Auto parts, such as tensioner and idler pulleys, must be precisely selected to ensure durability and performance.
Selection by OEM number, engine version, and accessories
When selecting components for a version such as BMW E90, it is good to verify the belt mileage, accessory variant, and OEM number compatibility with the specific engine. Data such as brand, condition, OEM part number, interchangeable numbers, and fuel type are helpful in products from this category, as they allow distinguishing visually similar rollers. In cars with a diesel engine, accessory configurations often differ from those in petrol versions, so it is worth comparing the position of the tensioner and adjacent rollers as well. Diagnostics can be supplemented by V-belts, ribbed belts, and parts as well as other belt guidance elements from the Other group.
Installation check and practical service tips
A belt tensioner refers to an assembly that maintains constant belt pressure during engine operation and accessory load changes. Before installation, check if the roller rotates smoothly, has no perceptible play, and maintains alignment with other components. When completing a repair for a specific model, e.g., Mini Cooper S, pay attention to the belt routing and service access, as disassembly of covers and the tensioner varies in different engine bays. A useful supplementary material is the article Go-Kart Feeling XXL: used N18 vs. B48 turbocharger – which one to choose for a Mini Cooper S?, which shows how important it is to combine part selection with verification of cooperating accessories.
How to maintain tensioner and idler pulleys?
- Regular inspection – During technical inspections, check the condition of the pulleys and belt tension.
- Bearing grease – Regularly lubricate bearings to ensure smooth and quiet operation.
- Removing contaminants – Clean pulleys of deposits and dirt to prevent corrosion and excessive wear.
- Repair or timely replacement – In case of damage, choose car parts that will restore full functionality to the drive system.
FAQ
| Question | Answer |
|---|---|
| What is the construction and purpose of tensioner and idler pulleys? | Tensioner and idler pulleys are belt guidance system elements mounted near engine accessories or within the timing system, depending on the vehicle design. A typical element consists of a working roller, a bearing, and a mounting point, and in some versions, it also works with a tensioner arm and spring. Their purpose is to maintain the correct belt path and stable operation of the entire system. |
| What are tensioner and idler pulleys used for? | Tensioner and idler pulleys are used to guide the belt and maintain its proper tension during engine operation. They limit slippage, noise, and vibrations, and also support the proper operation of the alternator, power steering pump, air conditioning, or other belt-driven components. Without functional rollers, the belt may run unevenly and wear out faster. |
| What is the construction and function of a belt tensioner? | A belt tensioner is an assembly responsible for maintaining constant belt pressure under varying operating conditions. It can be mechanical or spring-loaded and usually works with a roller, an axle, and a mounting element. Its function is to compensate for load changes and limit slack that could disrupt the operation of the entire accessory system. |
| How to choose a tensioner or idler pulley for a car? | It is safest to compare the OEM number, interchangeable numbers, engine version, fuel type, and mounting location in the vehicle. It is also worth checking the roller diameter, track width, and mounting method, as visually similar elements may differ in design details. Compatibility with the specific belt mileage is also helpful during selection. |
| What symptoms indicate wear of tensioner and idler pulleys? | The most common symptoms are bearing noise, belt squealing, accessory vibrations, and uneven belt running on the rollers. In some cases, there is also perceptible play, resistance during manual rotation, or signs of overheating on the roller track. Such symptoms should be compared with the condition of the belt and pulleys. |
| What to pay attention to during installation and inspection after replacement? | After installation, check the roller alignment, smoothness of rotation, and correct belt placement on all guides. It is also important to properly tighten the mounting according to the documentation for the given car version and check that there is no excessive play in the system. After starting the engine, it is worth observing whether the belt runs evenly and without noise. |
Summary: tensioner and idler pulleys at the Global Parts automotive store
Tensioner and idler pulleys are essential drive system components that affect the efficiency, durability, and smoothness of a vehicle's operation. The Global Parts offer includes used parts for many brands, including Mercedes, Audi, Volkswagen, and others, which makes it easy to match the right variant by OEM number, engine version, and accessories. This category is important wherever stable belt guidance, correct tension, and quiet system operation matter. We invite you to contact us – we are here to help! For more information and interesting facts, we also invite you to visit our automotive blog.