Yamato 302, Manual, Page: 11 / 30

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B. Inspection
1. Slight scratches on cylinder wall is permissible. Hone if necessary.
2. Replace piston rings if gap exceeds 0.812 mm (0. 032").
3. To check crankshaft, remove all bearings. Place "V" blocks on surface plate.
Support crankshaft ends on "V" blocks. Check by placing dial indicator on center
bearing surface while turning crankshaft. Maximum crankshaft deflection permissi-
ble 0.03 mm (0.0012").
4. Check upper and lower bearing for pits, excessive end play and wear.
5. Maximum bore wear 66.08 mm (2.602").
6. Minimum piston diameter 65.92 mm (2.595") measured at piston skirt, thrust side,
14 mm (9/16") above bottom.
C. Reassemble in reverse order with the following precautions.
1. Lubricate all bearings.
2. When placing crankshaft in crankcase, be sure knock pin (P-64) fits into split
sleeve of center bearing (P-15). Center bearing clip faces up. See figure 5.
3. After placing crankshaft in crankcase, install two 6 mm bolts on upper bearing
case assembly and one 6mm bolt on lower bearing case assembly on to
crankcase.
See figure 3 and 4.
4. Use gasket sealer to seal crankcase mating surfaces.
5. Install two remaining bolts to top and one to lower bearing case. Torque all 6 mm
bolts 5.9 ~ 8.8 Nm (60 ~ 90 kg cm / 4.4 ~ 6.5 ft lbs).
6. Install remaining 8mm nuts and two bolts on to crankcase.Torque all 8 mm bolts
and nuts 20 ~ 24 Nm (200 ~ 250 kg cm / 14 ~ 18 ft lbs). See figure 6.
7. Install piston. Piston has an arrow stamped on head. This arrow must be pointed
up. Centre piston pin. Install piston clips.