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GM 12508998 Bearing, Camshaft #3 &4

1985-2007 GM

Customer Questions & Expert Answers (4)
GM 12508998 Bearing, Camshaft #3 &4
  • Part Description
    BEARING, Engine Camshaft & Balance Shaft Front
  • Manufacturer
    General Motors
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  • Related Parts
  • Product Specifications
  • Vehicle Fitment
  • Customer Questions & Expert Answers
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number12508998
    Part DescriptionBEARING, Engine Camshaft & Balance Shaft Front
    Other NamesBearing
    Item Dimensions3.0 x 3.2 x 3.1 inches
    Item Weight0.50 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12508998
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2002-2005 Cadillac Escalade3/4 TON, EXT 3/4 TON
    2002-2006 Chevrolet Avalanche8 Cyl 8.1L3/4 TON
    1985-1991 Chevrolet Blazer1/2 TON
    1985-1986 Chevrolet C10REGULAR CAB LONG BOX, REGULAR CAB STANDARD BOX
    1988-1991 Chevrolet C15008 Cyl 7.4LC1500 EXTENDED CAB LONG BOX, C1500 EXTENDED CAB STANDARD BOX, C1500 REGULAR CAB LONG BOX, C1500 REGULAR CAB STANDARD BOX
    1985-1986 Chevrolet C208 Cyl 7.4LCREW CAB, REGULAR CAB
    1988-2000 Chevrolet C25008 Cyl 7.4LC2500 CREW CAB, C2500 EXTENDED CAB LONG BOX, C2500 EXTENDED CAB STANDARD BOX, C2500 REGULAR CAB
    1985-1986 Chevrolet C308 Cyl 7.4LCAB CHASSIS 135.5, CAB CHASSIS 159.9, CREW CAB, REGULAR CAB
    1988-2000 Chevrolet C35008 Cyl 7.4LC3500 CAB CHASSIS 135.5, C3500 CAB CHASSIS 159.9, C3500 CAB CHASSIS 183.5, C3500 CREW CAB LONG WHEELBASE, C3500 CREW CAB SHORT WHEELBASE, C3500 EXTENDED CAB, C3500 REGULAR CAB
    1996-2002 Chevrolet Express8 Cyl 7.4L, 8 Cyl 8.1L1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER
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  • Customer Questions & Expert Answers

    Q:
    I am wonder if this is complete and correct part for my vehicle. Posted by GMPartsGiant Specialist
    A:
    You can Select Your Vehicle to check if 12508998 fits your vehicle.
    Posted by GMPartsGiant Specialist
    Q:
    How to remove and install Camshaft Bearing,Camshaft and Lash Adjuster on Chevrolet K1500? Posted by Customer
    A:
    Before removing the camshaft, test the lobe lift to verify how much wear has occurred on the cam lobes. First, set number one piston at TDC on compression stroke. Then loosen rocker arm nuts and pivot the arms sideways. Thereafter fit a dial indicator over the engine, and set its stem touching top of first pushrod. Zero 0 Dial Indicator as well as slowly rotate crankshaft in normal direction until needle of indicator stops and begins to move in opposite way. Record this reading then replicate for every other valve. Where the maximum value of cam lobe lift is below that specified, install a new camshaft. Take off the intake manifold, rocker arms, push rods, timing chain and cam sprocket from the head prior to removing it from cylinder block; unfasten balancer shaft drive and driven gears if any; draw out camshaft very cautiously holding it at near block area; after removal look up bearing journals if they were worn out or damaged; inspect with micrometer bearing surfaces for increased clearances or ovality conditions; also review cams for discoloration as well as scoring marks being present; wash out lash adjusters and verify them under light projections or even examining several pittings or variable wear patterns; take off old gear roller followers too when replacing lobes including wipers along with it only; check rollers on roller type Lash Adjusters for wear/scoring/any damage that might be noticed therefrom/moly based grease/lube oil between lobes besides journals/insert nozzle into a hole (where not abraded), which must be careful at all costs not to scrape groove bearings. Next Lubricate all journals both lateral zones plus lopes with molly base greases or assembly compounds intended strictly for engines respectively: insert executive's element without scratching related beds but before enjoying harmonic aspect together by looking whether matching bones actually are still available plus need refitting them again: finally, oil changes should chiefly concern replacement of filters too then engine run on.
    Posted by GMPartsGiant Specialist
    Q:
    How do you determine the extent of cam lobe wear before removing the camshaft for the 1989 Chevrolet C1500? Posted by Customer
    A:
    To determine cam lobe wear, you should first position the number one piston at TDC on the compression stroke. Then, loosen the rocker arm nuts and pivot the rocker arms sideways. Afterward, mount a dial indicator on the engine and position the plunger against the top of the first pushrod. Zero the dial indicator and slowly turn the crankshaft in the normal direction of rotation until the indicator needle stops and begins to move in the opposite direction. Record this figure and repeat the check for each valve.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Camshaft Bearing
    Q:
    What maintenance should be performed before starting the engine for the 2001 Chevrolet Express? Posted by Customer
    A:
    Before starting the engine, refill the cooling system, change the oil, and install a new oil filter.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Camshaft Bearing
    If you have any questions about this product, please don't hesitate to ask us. We will be happy to help you!

Genuine GM Part 12508998, the Right Choice

To ensure reliability, purchase GM part # 12508998 Bearing, Camshaft #3 &4. It is sometimes referred to as GM Camshaft Bearing. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Cadillac Escalade models. It fits Chevrolet Blazer, P30, Silverado. It also fits GMC Sierra, Suburban, Yukon.

GMPartsGiant.com is a leading supplier of genuine GM parts and accessories such as GM 12508998 Bearing, Camshaft #3 &4. You're certainly in the right place if you're searching for the great cost-effective OEM GM parts. Look no further than our vast inventory of genuine GM parts offered at unbeatable online prices, all of which are backed by the manufacturer's warranty. Not to forget, our hassle-free return policy and quick delivery service ensure a smooth shopping experience for you. For detailed GMC parts information, click here.

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