Figure 4-30. Checking Piston Pin Retainer for Proper Sealing Using Tool J23987-01

TM 55-1930-208-24

4-11. PISTONS AND CONNECTING RODS - Continued.

f. Reassembly - Continued.

(9) Refer to figure 4-30 and check each retainer for proper seating with leak detector J23987-01. Place the

suction cup over the retainer and hand operate the lever to pull a vacuum of ten inches on the gage.

(10) Measure piston skirt diameter lengthwise and crosswise of piston pin bore. Measurements should be taken

at room temperature (70 or 21 ).

(11) The piston-to-liner clearance, with new parts, will vary with the particular piston and cylinder liner. A

maximum clearance of .012 inch is allowable with used parts.

Figure 4-30 .

Checking Piston Pin Retainer for Proper Sealing Using Tool J23987-01 .

(12) With cylinder liner installed in cylinder block, hold piston skirt upside down in the liner and check clearance

in four places 90apart.

(13) Refer to figure 4-31 and use feeler gage set J5438-01 to check the clearance. The spring scale attached to

the proper feeler gage, is used to measure the force in pounds required to withdraw feeler gage.

4-38