Piston Fitting
WARNING: This page is about a different car, the 2012 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
| 1 - FRONT |
| 2 - BORE GAUGE |
| 3 - CYLINDER BORE |
| 4 - 38 MM (1.5 in) |
- To correctly select the proper size piston, a cylinder bore gauge (2), capable of reading in 0.003 mm (.0001 in.) INCREMENTS is required. If a bore gauge is not available, do not use an inside micrometer. Refer to Fig 1.
- Measure the inside diameter of the cylinder bore (3) at a point 38.0 mm (1.5 inches) below top of bore. Start perpendicular (across or at 90 degrees) to the axis of the crankshaft at point A and then take an additional bore reading 90 degrees to that at point B.
1 - MOLY COATED 2 - MOLY COATED - The coated pistons (1, 2) will be serviced with the piston pin and connecting rod pre-assembled. Refer to Fig 2.
- The coating material is applied to the piston after the final piston machining process. Measuring the outside diameter of a coated piston (1, 2) will not provide accurate results. Therefore measuring the inside diameter of the cylinder bore with a dial Bore Gauge is MANDATORY . To correctly select the proper size piston, a cylinder bore gauge capable of reading in 0.003 mm (.0001 in.) increments is required.
- Piston installation into the cylinder bore requires slightly more pressure than that required for non-coated pistons. The bonded coating on the piston will give the appearance of a line-to-line fit with the cylinder bore.