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)

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Piston

Diameter
Measured at 50 mm (1.9685 inch) from outer perimeter top of piston to the pin axis
Coated Grade 1 3.5035 - 3.5043 Inch (in)
Coated Grade 2 3.6039 - 3.5048 Inch (in)
Coated Grade 3 3.5043 - 3.5051 Inch (in)
Uncoated Grade 1 3.50275 - 3.50314 Inch (in)
Uncoated Grade 2 3.50306 - 3.50362 Inch (in)
Uncoated Grade 3 3.50432 - 3.50511 Inch (in)
Piston to Bore Clearance 0.0005 - 0.0009 Inch (in)
Ring Groove Width Compression (Top) 0.0484 - 0.490 Inch (in)
Compression (Bottom) 0.0602 - 0.0608 Inch (in)
Oil Ring 0.1192 - 0.0120 Inch (in)
Piston Pin Bore Diameter 0.827-0.828 Inch (in)