Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1998ENVOY 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINESERVICE AND REPAIRENGINE OVERHAUL (UNIT REPAIR)REPAIR INSTRUCTIONSPISTON, CONNECTING ROD, AND BEARING REMOVAL
1998 GMC Envoy 2WD V6-4.3L VIN W
Piston, Connecting Rod, and Bearing Removal
1998 GMC Envoy 2WD V6-4.3L VIN WSECTION Piston, Connecting Rod, and Bearing Removal
^ Tools Required
- J 5239 Connecting Rod Bolt Guide Set
- J 24270 Cylinder Bore Ridge Reamer
1. Use the J24270 in order to remove the cylinder ring ridge.
1.1. Turn the crankshaft until the piston is at the bottom of the stroke.
1.2. Place a cloth on top of the piston.
1.3. Use the J 24270 to remove all of the cylinder ring ridge.
1.4. Turn the crankshaft so the piston is at the top of the stroke.
1.5. Remove the cloth.
1.6. Remove the cutting debris.
IMPORTANT: Place matchmarks or numbers on the connecting rods and the connecting rod caps.
2. Remove the connecting rod nuts.
3. Remove the connecting rod cap.
4. Use the J 5239 in order to protect the crankshaft journals and remove the connecting rod and the piston out of the top of the engine block.
IMPORTANT: Always assemble the connecting rod caps to the matching connecting rods.
5. Remove the connecting rod bearings.
^ Keep the connecting rod bearings with the original connecting rod and connecting rod cap.
^ Wipe the oil from the connecting rod bearings.
^ Wipe the oil from the crankpins.
- J 5239 Connecting Rod Bolt Guide Set
- J 24270 Cylinder Bore Ridge Reamer
1. Use the J24270 in order to remove the cylinder ring ridge.
1.1. Turn the crankshaft until the piston is at the bottom of the stroke.
1.2. Place a cloth on top of the piston.
1.3. Use the J 24270 to remove all of the cylinder ring ridge.
1.4. Turn the crankshaft so the piston is at the top of the stroke.
1.5. Remove the cloth.
1.6. Remove the cutting debris.
IMPORTANT: Place matchmarks or numbers on the connecting rods and the connecting rod caps.
2. Remove the connecting rod nuts.
3. Remove the connecting rod cap.
4. Use the J 5239 in order to protect the crankshaft journals and remove the connecting rod and the piston out of the top of the engine block.
IMPORTANT: Always assemble the connecting rod caps to the matching connecting rods.
5. Remove the connecting rod bearings.
^ Keep the connecting rod bearings with the original connecting rod and connecting rod cap.
^ Wipe the oil from the connecting rod bearings.
^ Wipe the oil from the crankpins.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.