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 MANUALSCHEVROLET1990STEP VAN 5.7 K, AUTOMATIC, 3L80/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICAL4.3L V6 - VIN [Z]ENGINE SPECIFICATIONSPISTON/PIN/RING SPECIFICATIONS
1990 Chevrolet Step Van 5.7 K, Automatic, 3L80/M40
Piston/Pin/Ring Specifications
1990 Chevrolet Step Van 5.7 K, Automatic, 3L80/M40SECTION Piston/Pin/Ring Specifications
PISTONS, PINS & RINGS SPECIFICATIONS
| Application | In. (mm) | ||||
|---|---|---|---|---|---|
| Piston Clearance | (1) .0007-.0017 (.017-.043) | ||||
| Pins | |||||
| Diameter | .9270-.9273 (23.545-23.553) | ||||
| Piston Fit | .0002-.0007 (.005-.017) | ||||
| Rod Fit | .0008-.0016 (.020-.041) | ||||
| Rings | |||||
| No. 1 | |||||
| End Gap | .010-.020 (.25-.51) | ||||
| Side Clearance | .001-.003 (.03-.07) | ||||
| No. 2 | |||||
| End Gap | .010-.025 (.25-.64) | ||||
| Side Clearance | .001-.003 (.03-.07) | ||||
| No. 3 (Oil) | |||||
| End Gap | .015-.055 (.38-1.40) | ||||
| Side Clearance | .002-.007 (.05-.17) | ||||
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RENDER: 1.0x
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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.