C . Adjust the piston pin installer (J 24086-9) to the correct length, using the letter-number scale on the installer adjuster. This is necessary to ensure that the piston pin is pressed into the piston to the correct depth. Refer to the instructions supplied with the tool for the proper setting. D . Lock the adjuster in place with the lock ring. NOTICE: After the installer hub bottoms on the support assembly, do not exceed 35,000 kPa (5,000 PSI) pressure, as this could cause damage to the tool. E . Place the adjuster in the support fixture. Press the piston pin into place (until the adjustable installer bottoms in the support fixture). F .
Remove the piston and connecting rod assembly from the tool and check the piston for freedom of movement on the piston pin. Installing the Piston Rings Figures 12-37 through 12-39 Measure 1 . Ring end gap as follows: A . Select rings comparable in size to the piston being used. B . Slip the compression ring into the cylinder bore and press it down about 7 mm (0.250 in.) above ring travel. Make sure the ring is square with the cylinder wall. C . Measure the space or gap between the ends of the ring with a feeler gage. D . Refer to “Specifications” in the proper Section for correct gap. E . If the gap between the ends of the ring is not as specified, remove the ring and try another for fit.
Inspect 1 . Ring fit as follows: A . Fit each compression ring to the piston on which it is going to be used. Figure 12-38 Checking Ring Fit B . Slip the outer surface of the top and second compression ring into the respective piston ring groove, to make sure that the ring is free. If binding occurs at any point, the cause should be determined. If binding is caused by the ring groove, correct by depressing the groove with a fine cut file. If the binding is caused by a distorted ring, try a new ring. NOTICE: All compression rings are marked on the upper side of the ring. When installing the compression rings, make sure the MARKED SIDE IS TOWARD THE TOP OF THE PISTON. NOTICE:
The oil control rings are three piece types, consisting of two rails and an expander. Assemble 1 . Expander. 2 . Lower rail. 3 . Upper rail. 4 . Lower compression ring. 5 . Upper compression ring. • Flex all rings to make sure they are free. If binding occurs at any point the cause should be determined. If binding is caused by the ring groove, correct by dressing the groove with a fine cut file. If binding is caused by a distorted ring, try a new ring. • Ring gaps must be 180° apart. • Rail gaps must be 180° apart. Figure 12-37 Measuring Ring End Gap G643 (E) Service Manual Chapter 3. Engine Mechanical System 79