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GM 25527178 Piston, W/Pinion(Std High, Limit)

1982-1988 GM

Customer Questions & Expert Answers (8)
GM 25527178 Piston, W/Pinion(Std High, Limit)
  • Part Description
    PISTON, Engine Piston
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Product Specifications
  • Vehicle Fitment
  • Customer Questions & Expert Answers
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number25527178
    Part DescriptionPISTON, Engine Piston
    Other NamesPiston
    Item Dimensions4.8 x 4.5 x 4.4 inches
    Item Weight1.80 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU25527178
    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
    1984-1988 Buick Century6 Cyl 3.8LCUSTOM 2 DOOR, CUSTOM 4 DOOR, CUSTOM STATION WAGON, LIMITED 2 DOOR, LIMITED 4 DOOR
    1985-1988, 1982-1983 Buick Electra6 Cyl 3.8L, 6 Cyl 4.1L2 DOOR, 4 DOOR, COUPE 2 DOOR, ELECTRA ESTATE WAGON, LIMITED 2 DOOR, LIMITED 4 DOOR, SEDAN 4 DOOR, T-TYPE COUPE 2 DOOR, T-TYPE SEDAN 4 DOOR
    1982-1985 Buick Estate Wagon6 Cyl 3.8L, 6 Cyl 4.1LCUSTOM 2 DOOR, CUSTOM 4 DOOR, ELECTRA ESTATE WAGON, ESTATE WAGON, LIMITED 2 DOOR, LIMITED 2 DOOR COLLECT SP EDIT, LIMITED 4 DOOR, LIMITED 4 DOOR COLLECT SP EDIT
    1982-1986 Buick Lesabre6 Cyl 3.8L, 6 Cyl 4.1LCUSTOM 2 DOOR, CUSTOM 4 DOOR, ELECTRA ESTATE WAGON, ESTATE WAGON, LIMITED 2 DOOR, LIMITED 2 DOOR COLLECT SP EDIT, LIMITED 4 DOOR, LIMITED 4 DOOR COLLECT SP EDIT
    1982-1987 Buick Regal6 Cyl 3.8L, 6 Cyl 4.1L2 DOOR, 4 DOOR, REGAL, STATION WAGON
    1986, 1982-1984 Buick Riviera6 Cyl 3.8L, 6 Cyl 4.1LCONVERTIBLE COUPE, RIVIERA, T TYPE
    1982 Cadillac Deville6 Cyl 4.1L2 DOOR, 4 DOOR, BROUGHAM 2 DOOR, BROUGHAM 4 DOOR
    1982 Cadillac Eldorado6 Cyl 4.1LELDORADO
    1982 Cadillac Fleetwood6 Cyl 4.1L2 DOOR, 4 DOOR, BROUGHAM 2 DOOR, BROUGHAM 4 DOOR
    1982 Cadillac Seville6 Cyl 4.1LSEVILLE
    View More
  • Customer Questions & Expert Answers

    Q:
    I would like to confirm if this is the correct part number for my vehicle. Please advise. Thank you. Posted by GMPartsGiant Specialist
    A:
    You can Select Your Vehicle to check if 25527178 fits your vehicle.
    Posted by GMPartsGiant Specialist
    Q:
    How to remove and inspect pistons in an engine on Buick Regal? Posted by Customer
    A:
    Before removing the pistons, inspect the cylinder bore for a ridge felt by hand. Use a ridge reamer for that purpose. To start piston removal, you need to match each connecting rod cap with its respective rod number. Place a rubber hose over the connecting rod studs on the crankshaft and cylinders so they don't get scratched or damaged. Then, lubricate the cylinder wall with clean engine oil and tap the piston gently out using a wooden dowel. Repeat for all pistons in the same way. After taking them off, clean cylinder bore and pistons thoroughly using soap and water before applying clean engine oil to prevent corrosion. The piston rings are removed using ring expander tool then piston grooves are cleaned. Cylinder bore diameter and piston clearance are measured by telescopic gauge in combination with micrometer. Piston should be marked for reference. Pistons having pressed-in wrist pins must be removed using special tools while snap-ringed pins can be taken out through use of screwdriver. Replace / install wrist pins as required. When you fit in new rings, make sure they do not get damaged by utilizing piston ring expander. According to manufacturer's instructions, place the rings correctly on the pistons just as directed by their manufacturers' manual guides . In case of any damage or wear-out, inspect and replace connecting rod bearings when necessary. Use Plastigage® to check bearing clearance. Choose appropriate undersized bearing shell where necessary if there's an excessive clearance . Observe proper side clearance between rods and crankshaft in installing bearings, pistons, and connecting rods as per manufacturer specifications . Finally, reassemble engine components including oil pump(s), oil pan(s), cylinder head(s) and intake manifold(s).
    Posted by GMPartsGiant Specialist
    Q:
    What should I check for before removing the pistons for the 1987 Buick Century? Posted by Customer
    A:
    Before removing the pistons, inspect the cylinder bore for a ridge, which can be felt by hand. If present, use a ridge reamer to carefully remove it.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Piston
    Q:
    What should be checked on the connecting rods for the 1983 Chevrolet Caprice? Posted by Customer
    A:
    It is essential to check the connecting rods for twist, bending, nicks, or cracks. Any issues found will necessitate replacement.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Piston
    Q:
    What is the correct sequence for removing the connecting rod nuts for the 1982 Chevrolet Caprice? Posted by Customer
    A:
    Remove the nuts on the connecting rod stud in sequence and lift the cap off the crankshaft.
    Posted by GMPartsGiant Specialist
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    Q:
    How can damage to the crankshaft or cylinder wall be prevented during piston assembly removal for the 1982 Chevrolet El Camino? Posted by Customer
    A:
    Cover the connecting rod studs with rubber or plastic tubing.
    Posted by GMPartsGiant Specialist
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    Q:
    What should be done after removing the ridge from a cylinder for the 1986 Oldsmobile Cutlass? Posted by Customer
    A:
    After removing the ridge, crank the engine until the piston is at the top of the cylinder, then remove the cloth and cuttings to avoid damaging the piston rings, pistons, or cylinder walls.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Piston
    Q:
    What should be checked on the connecting rods for the 1986 Oldsmobile Cutlass? Posted by Customer
    A:
    The rods must be checked for twist and bending, and inspected for nicks or cracks. Any issues found will necessitate the replacement of the rod.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Piston
    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 25527178, the Right Choice

To ensure reliability, purchase GM part # 25527178 Piston, W/Pinion(Std High, Limit). It is sometimes referred to as GM Piston. 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 Buick Century, Lesabre, Regal models. It fits Cadillac Deville, Fleetwood, Seville. It also fits Chevrolet Caprice, Impala, Malibu. This also fits Pontiac Bonneville, Grand Prix, Parisienne.

GMPartsGiant.com is a leading supplier of genuine GM parts and accessories such as GM 25527178 Piston, W/Pinion(Std High, Limit). 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 Chevrolet parts information, click here.

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