DMax Serpentine Belt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hotcorner · 04-03-2021, 09:33 AM

When I bought my truck 3 years ago, the PO had sprayed belt dressing all over the serpentine belt. Squeaked like hell. So, I changed the serpentine belt, but the residue on the pulleys made it start squeaking again. For another 10k miles this thing has squeaked. Despite multiple efforts to clean it with engine cleaner and brake cleaner, squeaking keeps coming back. I wonder now if the belt is impregnated with goo that just won’t come out of the grooves. I can swap the belt again, but I am worried a new one will squeak too due to pulley contamination.

Thoughts?

**hatzie** · 04-03-2021, 11:50 AM

I assume the tensioner and the idlers are in good nick.

Belt dressing is bad juju. You can probably get it off with chemicals and elbow grease.
Steel wool and WD-40, Goo Gone, or worst case Acetone or Toluene or Xylene.
Take care with the more enthusiastic chemicals like Acetone, Toluene, Xylene, and probably Goo Gone because they can melt nylon and other polymers that they make pulleys out of. Not to mention the grease seals on the idler pulleys, wiring jackets, sensor bodies, your intake manifold, and other such stuff so you need to be very careful to not splash it around.

Hotcorner · 04-04-2021, 02:04 PM

Squeaking definitely is not a bearing. Slightest whiff of WD40 on the belt and it stops squeaking.
Posted via Mobile Device

04-03-2021, 09:33 AM	#1
Hotcorner Registered User Join Date: Apr 2017 Location: Knoxville, Tennessee Posts: 892	DMax Serpentine Belt When I bought my truck 3 years ago, the PO had sprayed belt dressing all over the serpentine belt. Squeaked like hell. So, I changed the serpentine belt, but the residue on the pulleys made it start squeaking again. For another 10k miles this thing has squeaked. Despite multiple efforts to clean it with engine cleaner and brake cleaner, squeaking keeps coming back. I wonder now if the belt is impregnated with goo that just won’t come out of the grooves. I can swap the belt again, but I am worried a new one will squeak too due to pulley contamination. Thoughts? __________________ 1969 GMC K25 2007 Chevy 2500HD Classic Duramax 1999 Tahoe 2DR 4WD Base Model 5.7l

04-03-2021, 11:50 AM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,912	Re: DMax Serpentine Belt I assume the tensioner and the idlers are in good nick. Belt dressing is bad juju. You can probably get it off with chemicals and elbow grease. Steel wool and WD-40, Goo Gone, or worst case Acetone or Toluene or Xylene. Take care with the more enthusiastic chemicals like Acetone, Toluene, Xylene, and probably Goo Gone because they can melt nylon and other polymers that they make pulleys out of. Not to mention the grease seals on the idler pulleys, wiring jackets, sensor bodies, your intake manifold, and other such stuff so you need to be very careful to not splash it around. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-04-2021, 02:04 PM	#3
Hotcorner Registered User Join Date: Apr 2017 Location: Knoxville, Tennessee Posts: 892	Re: DMax Serpentine Belt Squeaking definitely is not a bearing. Slightest whiff of WD40 on the belt and it stops squeaking. Posted via Mobile Device

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