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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 03-07-2019, 05:43 PM   #1 (permalink)
5Cent
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Different idler pulley style

I went to change out the tensioner, 2 idler pulleys and belt this past weekend on my 2014 LML, and already ordered parts a head of time.


To my surprise, the first or top pulley came off easy but when compared to the replacement out of the box, there was definitely going to be an issue. Not sure how different the alignment would be, I dry fitted it and realized it was a definite no go.


Charlie at Merchant was awesome and we found that there are 2 versions that fit through a quick chat, but the other option is not listed in the LML section, only the L5P section. Anyone else run into this? Any rhyme or reason on which engine gets which? Mine is a single alternator setup.


Ordered(LML): GM # 98057284
https://www.merchant-automotive.com/...2001-2016.aspx

Actual (L5P/LML):GM # 12611935
https://www.merchant-automotive.com/...D=509&PID=7684

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Last edited by 5Cent; 03-07-2019 at 05:47 PM.
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Old 03-08-2019, 12:08 PM   #2 (permalink)
Rvn4me
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You just ordered the wrong one.
98057284 Is used for duel alternators.

GM Part No.: 12611935 Pulley Asm-Belt Idler This part fits the vehicle you selected: 2014 Light Truck Silverado / Sierra Heavy Duty - 03, 43 Bodystyle (4WD) (Carryover Model) 8 Cyl 6.6L Diesel Dual Turbo, DI, DURAMAX; 6-Speed Automatic Transmission, ALLISON, LCT 1000, Overdrive; Crew Cab 6'6" Box 3/4 Ton Fitting Vehicle Options: CK2,3(LML) Fitting Vehicle Options: CK2,3(L5P)


GM Part No.: 98057284 This part does not fit the vehicle you selected: 2014 Light Truck Silverado / Sierra Heavy Duty - 03, 43 Bodystyle (4WD) (Carryover Model) 8 Cyl 6.6L Diesel Dual Turbo, DI, DURAMAX; 6-Speed Automatic Transmission, ALLISON, LCT 1000, Overdrive; Crew Cab 6'6" Box 3/4 Ton


Last edited by Rvn4me; 03-08-2019 at 12:36 PM.
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Old 03-10-2019, 09:29 AM   #3 (permalink)
5Cent
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I'm surprised I am the first to run into this. Merchant was great to work with, they are updating their site to show both models under the LML section as there is no way to know there are two options since only the one was showing.
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2014 Chevy 2500HD, DMAX, Allison Auto, CC, 6.5' bed, LT trim.....staying stock

RIP: 2001 Chevy 2500 HD, DMax, Allison Auto, SB, EC, 4x4, LS Trim, Straight-piped, Banks 6 gun w/ Speedloader and Dynafact EGT/Boost gauges, Kennedy Lift Pump, Nictane 1micron filter & adaptor, 265 (E) Wrangler Silent Armors, Bilstein 5100's.

2015 Keystone 28BHS
RIP: 1997 Fleetwood Prowler 26T - Fiberglass
1983 Fleetwood Wilderness 17 - Tin
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Old 03-10-2019, 10:09 AM   #4 (permalink)
G2GBY
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All other sites show this.
Doal alternators take three pulleys. Two GM Part :12611935 & one GM Part :98057284
Single alternators take two GM Part :12611935

Last edited by G2GBY; 03-10-2019 at 10:11 AM.
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