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 MANUALSCHEVROLET1994ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON, ENGINE
1994 Chevrolet Astro Van M V6-262 4.3L VIN Z
Piston, Engine
1994 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION Piston, Engine
Engine Liter/CID 4.3L/V6-262
All specifications given in inches.
Piston Diameter (Std.) [01] 3.9988-4.0008
Piston Clearance 0.0007-0.0017 [07]
Piston Pin Diameter (Std.) 0.9270-0.09273
Pin To Piston Bore Clearance [05] 0.0010
Piston Rings
End Gap [02]
Comp. [21]
Oil 0.015
Side Clearance
Comp. 0.0014-0.0032
Oil 0.0014-0.0032
[01] Measured at 90 deg. angle to piston pin.
[02] Minimum.
[05] Maximum.
[07] Service limit, 0.0027 inch.
[21] Top ring, 0.010 inch; second ring, 0.018 inch.
All specifications given in inches.
Piston Diameter (Std.) [01] 3.9988-4.0008
Piston Clearance 0.0007-0.0017 [07]
Piston Pin Diameter (Std.) 0.9270-0.09273
Pin To Piston Bore Clearance [05] 0.0010
Piston Rings
End Gap [02]
Comp. [21]
Oil 0.015
Side Clearance
Comp. 0.0014-0.0032
Oil 0.0014-0.0032
[01] Measured at 90 deg. angle to piston pin.
[02] Minimum.
[05] Maximum.
[07] Service limit, 0.0027 inch.
[21] Top ring, 0.010 inch; second ring, 0.018 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.