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 MANUALSCHEVROLET1987SUBURBAN R20, 7.4 N, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICAL5.7L V8 - VIN [K]ENGINE SPECIFICATIONSPISTON/PIN/RING SPECIFICATIONS
1987 Chevrolet Suburban R20, 7.4 N, 400/M40
Piston/Pin/Ring Specifications
1987 Chevrolet Suburban R20, 7.4 N, 400/M40SECTION Piston/Pin/Ring Specifications
PISTONS, PINS & RINGS SPECIFICATIONS
| Application | Inch (mm) | ||
|---|---|---|---|
| Piston Clearance | .0007-.0017 (.018-.043) | ||
| Pins | |||
| Piston Fit | .0002-.0007 (.005-.017) | ||
| Rod Fit | .0008-.0016 (.020-.041) | ||
| Rings | |||
| Ring No. 1 | |||
| End Gap | .010-.020 (.25-.51) | ||
| Side Clearance | .0012-0032 (.031-.081) | ||
| Ring No. 2 | |||
| End Gap | .010-.025 (.25-.64) | ||
| Side Clearance | .0012-.0032 (.031-.081) | ||
| Ring No. 3 | |||
| End Gap | .015-.055 (.38-1.40) | ||
| Side Clearance | .002-.007 (.05-.17) | ||
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.