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 MANUALSCHEVROLET1998EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON RING, ENGINE
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Piston Ring, Engine
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Piston Ring, Engine
Piston Rings (End Gap Measured in Cylinder Bore)
Piston Compression Ring Gap (Production-Top Groove) 0.25 - 0.40 mm (0.098 - 0.015 inch)
Piston Compression Ring Gap (Production-2nd Groove) 0.46 - 0.66 mm (0.018 - 0.025 inch)
Piston Compression Ring Gap (Service-Top Groove) 0.25 - 0.50 mm (0.009 - 0.019 inch)
Piston Compression Ring Gap (Service-2nd Groove) 0.46 - 0.80 mm (0.018 - 0.031 inch)
Piston Compression Ring Groove Clearance (Production-Top Groove) 0.030 - 0.070 mm (0.0012 - 0.0027 inch )
Piston Compression Ring Groove Clearance (Production-2nd Groove) 0.040 - 0.080 mm (0.0015 - 0.003 inch )
Piston Compression Ring Groove Clearance (Service Limit-Top Groove) 0.030 - 0.090 mm (0.0012 - 0.0035 inch )
Piston Compression Ring Groove Clearance (Service Limit-2nd Groove) 0.040 - 0.100 mm (0.0015 - 0.0040 inch )
Piston Oil Ring Gap (Production) 0.25 - 0.76 mm (0.009 - 0.029 inch)
Piston Oil Ring Gap (Service) 0.25 - 0.90 mm (0.009 - 0.035 inch)
Piston Oil Ring Groove Clearance (Production) 0.046 - 0.096 mm (0.0018 - 0.0037 inch)
Piston Oil Ring Groove Clearance (Service) 0.046 - 0.100 mm (0.0018 - 0.0039 inch)
Piston Compression Ring Gap (Production-Top Groove) 0.25 - 0.40 mm (0.098 - 0.015 inch)
Piston Compression Ring Gap (Production-2nd Groove) 0.46 - 0.66 mm (0.018 - 0.025 inch)
Piston Compression Ring Gap (Service-Top Groove) 0.25 - 0.50 mm (0.009 - 0.019 inch)
Piston Compression Ring Gap (Service-2nd Groove) 0.46 - 0.80 mm (0.018 - 0.031 inch)
Piston Compression Ring Groove Clearance (Production-Top Groove) 0.030 - 0.070 mm (0.0012 - 0.0027 inch )
Piston Compression Ring Groove Clearance (Production-2nd Groove) 0.040 - 0.080 mm (0.0015 - 0.003 inch )
Piston Compression Ring Groove Clearance (Service Limit-Top Groove) 0.030 - 0.090 mm (0.0012 - 0.0035 inch )
Piston Compression Ring Groove Clearance (Service Limit-2nd Groove) 0.040 - 0.100 mm (0.0015 - 0.0040 inch )
Piston Oil Ring Gap (Production) 0.25 - 0.76 mm (0.009 - 0.029 inch)
Piston Oil Ring Gap (Service) 0.25 - 0.90 mm (0.009 - 0.035 inch)
Piston Oil Ring Groove Clearance (Production) 0.046 - 0.096 mm (0.0018 - 0.0037 inch)
Piston Oil Ring Groove Clearance (Service) 0.046 - 0.100 mm (0.0018 - 0.0039 inch)
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.