How to remove and reassemble piston/connecting rod assemblies in an engine?

Prior to removing the piston/connecting rod assemblies, check for ridges formed at the upper limit of ring travel and remove them if necessary. Turn the engine so the crankshaft is facing up. Check the connecting rod endplay with feeler gauges and consult an automotive machine shop if necessary. Mark the connecting rods and caps for identification. Remove the connecting rod cap bolts and the number one connecting rod cap and bearing insert. Push the connecting rod/piston assembly out through the top of the engine. Repeat this procedure for the remaining cylinders. Reassemble the connecting rod caps and bearing inserts and install the cap bolts finger tight. Check the piston ring end gaps and adjust if necessary. Install the rings on the pistons, starting with the oil control ring. Check that the upper and lower side rails can rotate smoothly. Install the number two and number one rings. Repeat this procedure for the remaining pistons and rings. Clean the cylinder walls, chamfer the top edge of each cylinder bore, and ensure the crankshaft is in place. Clean the bearing surfaces of the connecting rod and cap. Lubricate the piston and rings and use a piston ring compressor to compress the rings. Rotate the crankshaft and apply oil to the cylinder walls. Insert the piston/connecting rod assembly into the cylinder bore. Check the connecting rod bearing oil clearance using Plastigage. Clean the bearing faces and apply grease or engine assembly lube. Slide the connecting rod back into place, install the rod cap, and tighten the bolts. Repeat this procedure for the remaining pistons/connecting rods. Rotate the crankshaft to check for any binding and check the connecting rod endplay.

Genuine Chevrolet Cobalt Piston

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Chevrolet Cobalt Piston Kit
Part Number: 12646457
$43.75 MSRP: $108.77
You Save: $65.02 (60%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: PISTON KIT, Engine Piston; Piston
- Replaces: 12608531, 12631102, 19180835, 89018112
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2008 Chevrolet Cobalt | 2 DOOR, 4 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL ONE (LS) 2 DOOR, LEVEL ONE (LS) 4 DOOR, LEVEL THREE (SS) 2 DOOR, LEVEL THREE (SS) 4 DOOR, LEVEL TWO (LT) 2 DOOR, LEVEL TWO (LT) 4 DOOR | 4 Cyl 2.4L
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Chevrolet Cobalt Piston Asm,(W/ Pinion)
Part Number: 89018108
$86.00 MSRP: $135.35
You Save: $49.35 (37%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: PISTON, Engine Piston; Piston
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2010 Chevrolet Cobalt | LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 4 DOOR | 4 Cyl 2.0L
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Chevrolet Cobalt Piston Assembly, (W/ Pinion)
Part Number: 12591087
$84.35 MSRP: $132.73
You Save: $48.38 (37%)
ADD TO CART
Product Specifications
- Other Name: PISTON, Engine Piston; Piston
- Replaces: 12572796, 12608528
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2008 Chevrolet Cobalt | 2 DOOR, 4 DOOR, LEVEL 4 PERFORMANCE (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL ONE (LS) 2 DOOR, LEVEL ONE (LS) 4 DOOR, LEVEL THREE (SS) 2 DOOR, LEVEL THREE (SS) 4 DOOR, LEVEL TWO (LT) 2 DOOR, LEVEL TWO (LT) 4 DOOR | 4 Cyl 2.2L
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Chevrolet Cobalt Piston Asm,(W/ Pinion)
Part Number: 19180242
$73.92 MSRP: $116.32
You Save: $42.40 (37%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: PISTON, Engine Piston; Piston
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2010 Chevrolet Cobalt | 2 DOOR, 4 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 4 DOOR, LEVEL ONE (LS) 2 DOOR, LEVEL ONE (LS) 4 DOOR, LEVEL TWO (LT) 2 DOOR, LEVEL TWO (LT) 4 DOOR | 4 Cyl 2.2L
View related parts
Chevrolet Cobalt Piston Asm
Part Number: 12791210
Product Specifications
- Other Name: PISTON, Engine Piston; Piston
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2007 Chevrolet Cobalt | LEVEL 4 PERFORMANCE (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR | 4 Cyl 2.0L

Chevrolet Cobalt Piston

The Piston in Chevrolet Cobalt vehicles is an inside combustion engine that plays an important role in converting combustion power in energy for vehicles. It works through pushing force from the expanding gases to the crank shaft for better performance of the engine. Cobalt pistons may also possess features such as cooling cavities and gas-tight piston rings due to the high pressures and temperatures that they encounter normally are made from aluminum alloys for strength and light weight. Various types of pistons have also been used by Models of Cobalt and included are trunk pistons that applied to side forces, for Petrol as well as for Diesel Engines and those containing the Oil Rings. Furthermore, racing pistons have a lightweight cast construct and a strong design to meet the racing high RPM requirement. Different pistons have different properties in terms of handling performance, durability and efficiency and this combination reflects the relevance of piston design for the operation of Chevrolet Cobalt.

Each OEM Chevrolet Cobalt Piston we offer is competitively priced and comes with the assurance of the manufacturer's warranty for the part. Furthermore, we guarantee the speedy delivery of your orders right to your doorstep. Our hassle-free return policy is also in place for your peace of mind.

Chevrolet Cobalt Piston Parts Questions & Experts Answers

Piston Kit
12646457
Q: How to remove and reassemble piston/connecting rod assemblies in an engine?
A: Prior to removing the piston/connecting rod assemblies, check for ridges formed at the upper limit of ring travel and remove them if necessary. Turn the engine so the Crankshaft is facing up. Check the connecting rod endplay with feeler gauges and consult an automotive machine shop if necessary. Mark the connecting rods and caps for identification. Remove the connecting rod cap bolts and the number one connecting rod cap and bearing insert. Push the connecting rod/piston assembly out through the top of the engine. Repeat this procedure for the remaining cylinders. Reassemble the connecting rod caps and bearing inserts and install the cap bolts finger tight. Check the piston ring end gaps and adjust if necessary. Install the rings on the pistons, starting with the oil control ring. Check that the upper and lower side rails can rotate smoothly. Install the number two and number one rings. Repeat this procedure for the remaining pistons and rings. Clean the cylinder walls, chamfer the top edge of each cylinder bore, and ensure the crankshaft is in place. Clean the bearing surfaces of the connecting rod and cap. Lubricate the piston and rings and use a piston ring compressor to compress the rings. Rotate the crankshaft and apply oil to the cylinder walls. Insert the piston/connecting rod assembly into the cylinder bore. Check the connecting rod bearing oil clearance using Plastigage. Clean the bearing faces and apply grease or engine assembly lube. Slide the connecting rod back into place, install the rod cap, and tighten the bolts. Repeat this procedure for the remaining pistons/connecting rods. Rotate the crankshaft to check for any binding and check the connecting rod endplay.