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 MANUALSCHEVROLET1994LUMINA V6-204 3.4L DOHCREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON, ENGINE
1994 Chevrolet Lumina V6-204 3.4L DOHC
Piston, Engine
1994 Chevrolet Lumina V6-204 3.4L DOHCSECTION Piston, Engine
Engine Liter/VIN 3.4L/X
All Measurements Given In Inches Unless Otherwise Specified
Piston Diameter (Std.) 3.6208-3.6217
Piston Clearance 0.0013-0.0027
Piston Pin Diameter [01] 0.9052-0.9054
Piston Pin To Piston Clearance 0.0005-0.0009
Piston Ring End Gap [02]
Comp. [09]
Oil 0.008
Piston Ring Side Clearance
Comp. 0.0016-0.0035
Oil 0.008
[01] Pistons & pins are matched set & should be replaced as an assembly.
[02] Maximum.
[09] Top ring, 0.016 inch] 2nd ring, 0.029 inch.
All Measurements Given In Inches Unless Otherwise Specified
Piston Diameter (Std.) 3.6208-3.6217
Piston Clearance 0.0013-0.0027
Piston Pin Diameter [01] 0.9052-0.9054
Piston Pin To Piston Clearance 0.0005-0.0009
Piston Ring End Gap [02]
Comp. [09]
Oil 0.008
Piston Ring Side Clearance
Comp. 0.0016-0.0035
Oil 0.008
[01] Pistons & pins are matched set & should be replaced as an assembly.
[02] Maximum.
[09] Top ring, 0.016 inch] 2nd ring, 0.029 inch.
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.