ENGINE MECHANICAL 6A – 75 2. Measure the piston diameter. Piston Measuring Point 4JA1T(L) 4JA1TC 4JH1TC
mm (in) 78 (3.07) 70 (2.76)
Piston Grade (Service Part) 015LX021
4JA1T(L) 4JA1TC
mm (in)
AX
92.949 - 92.964 (3.6549 - 3.6600)
CX
92.965 - 92.980 (3.6600 - 3.6606)
AX
95.359 - 95.374 (3.7542 - 3.7548)
CX
95.375 - 95.390 (3.7548 - 3.7555)
4JH1TC
Cylinder Liner and Piston Clearance mm (in) 4JA1T(L) 0.041-0.071 (0.0016-0.0027) 4JA1TC 4JH1TC 0.047-0.065 (0.0019-0.0026) NOTE: Cylinder liner kit clearances are preset. However, the cylinder liner installation procedure may result in slight decreases in cylinder liner clearances. Always measure the cylinder liner clearance after installation to be sure that it is correct.
TAPPET AND PUSH ROD
014RY00028
Visually inspect the tappet contact surfaces for pitting, cracking, and other abnormal conditions. The tappet must be replaced if any of these conditions are present. Refer to the illustration at the left. 1. Normal contact 2. Cracking 3. Pitting 4. Irregular contact Uneven contact 5. Irregular contact One-sided contact NOTE: The tappet surfaces are spherical. Do not attempt to grind them with an oil stone or similar tool in an effort to repair the tappet. If the tappet is damaged, it must be replaced.