Jeep Workshop Service and Repair Manuals

Piston: Specifications

GENERAL SPECIFICATIONS 

Pistons 
Weight (less Pinch) .....................................................................................................................................................  563 to 567 grams (19.86 to 20.00 oz)
Piston Pin Bore
(Centerline to Piston top) ........................................................................................................................................  40.61 to 40.72mm (1.599 to 1.603 inch)
Piston-to-Bore Clearance ....................................................................................................................................  0.033 to 0.053mm (0.0013 to 0.0021 inch)
Piston-to-Bore Clearance
(Preferred) ...........................................................................................................................................................  0.033 to 0.038mm (0.0013 to 0.015 inch )
Ring Gap Clearance-
Top Compression Ring .......................................................................................................................................  0.229 to 0.610mm (0.0090 to 0.0240 inch)
Ring Gap Clearance-
2nd Compression Ring .......................................................................................................................................  0.483 to 0.965mm (0.0190 to 0.0380 inch)
Ring Gap Clearance-
Oil Control Steel Rails ............................................................................................................................................  0.254 to 1.500mm (0.010 to 0.060 inch)
Ring Side Clearance-
Compression Rings .............................................................................................................................................  0.042 to 0.084mm (0.0017 to 0.0033 inch)
Ring Side Clearance-
Oil control Rings ....................................................................................................................................................  0.06 to 0.21mm (0.0024 to 0.0083 inch)
Piston Ring Groove Height-
Compression Rings .............................................................................................................................................  1.530 to 1.555mm (0.0602 to 0.0612 inch)
Piston Ring groove Height-
Oil Control Ring .................................................................................................................................................  4.035 to 4.060mm (0.1589 to 0.1598 inch)
Piston Ring Groove Diameter-
Oil Control Ring .....................................................................................................................................................  90.35 to 90.60mm (3.557 to 3.566 inch)
Piston Pin  Diameter .....................................................................................................................................  23.637 to 23.640mm (0.9306 to 0.09307 inch)
Piston Pin Bore Diameter ...............................................................................................................................  23.647 to 23.655mm (0.9310 to 0.9313 inch)
Piston-to-Pin 
Clearance ..................................................................................................................................  0.0076 to 0.0178mm-Loose (0.0003 to 0.0007 inch Loose)
Piston-to-Pin Clearance (Preferred) ..................................................................................................................................................  0.013mm (0.0005 inch)
Piston-to-pin Connecting Rod (Press Fit) ...............................................................................................................................................  8.9kN (2000 lb. ft..)