Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Piston Dimensions and Clearances

Piston Bore Clearance (Production) 0.0007-0.0024 Inch (in)
Piston Bore Clearance (Service) 0.0029 (Maximum) Inch (in)
Piston Rings (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 (Maximum) 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 0.002-0.0027 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)