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 MANUALSCHEVROLET1998ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON RING, ENGINE
1998 Chevrolet Astro Van 2WD V6-4.3L VIN W
Piston Ring, Engine
1998 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Piston Ring, Engine
NOTE: End Gap Measured In Cylinder Bore.
Piston Compression Ring Gap
(Production-Top Groove) 0.25 - 0.40 mm (0.010 - 0.016 inch)
Piston Compression Ring Gap
(Production-2nd Groove) 0.46 - 0.66 mm (0.018 - 0.026 inch (Maximum)
Piston Compression Ring Gap
(Service-Top Groove) 0.5 mm (Maximum) (0.19 inch (Maximum)
Piston Compression Ring Gap
(Service-2nd Groove) 0.8 mm (Maximum) (0.31 inch (Maximum)
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 - 0.0031 inch)
Piston Compression Ring Groove Clearance
(Service) 0.085 mm (Maximum) (0.0033 inch (Maximum)
Piston Oil Ring Gap
(Production) 0.25 - 0.76 mm (0.010 - 0.029 inch)
Piston Oil Ring Gap
(Service) 0.90 mm (Maximum) (0.035 inch (Maximum)
Piston Oil Ring Groove Clearance
(Production) 0.046 - 0.096 mm (0.0018 - 0.0037 inch)
Piston Oil Ring Groove Clearance
(Service) 0.10 mm (Maximum) (0.0039 inch (Maximum)
Piston Compression Ring Gap
(Production-Top Groove) 0.25 - 0.40 mm (0.010 - 0.016 inch)
Piston Compression Ring Gap
(Production-2nd Groove) 0.46 - 0.66 mm (0.018 - 0.026 inch (Maximum)
Piston Compression Ring Gap
(Service-Top Groove) 0.5 mm (Maximum) (0.19 inch (Maximum)
Piston Compression Ring Gap
(Service-2nd Groove) 0.8 mm (Maximum) (0.31 inch (Maximum)
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 - 0.0031 inch)
Piston Compression Ring Groove Clearance
(Service) 0.085 mm (Maximum) (0.0033 inch (Maximum)
Piston Oil Ring Gap
(Production) 0.25 - 0.76 mm (0.010 - 0.029 inch)
Piston Oil Ring Gap
(Service) 0.90 mm (Maximum) (0.035 inch (Maximum)
Piston Oil Ring Groove Clearance
(Production) 0.046 - 0.096 mm (0.0018 - 0.0037 inch)
Piston Oil Ring Groove Clearance
(Service) 0.10 mm (Maximum) (0.0039 inch (Maximum)
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.