Service Information - Honda 1998 VT750C Service Manual

CRANKSHAFTjTRANSMISSION
SERVICE INFORMATION
GENERAL
• The crankcase halves must be separated to service the crankshaft, connecting rod and transmission (including the shift
fork and shift drum). To service there parts, the engine must be removed from the engine (Section 7).
• The following parts must be removed before separating the crankcase:
- Oil filter (Section 3)
- Water pump (Section 6)
- Cylinder head (Section 10)
- Cylinder, piston (Section 11)
- Clutch, gearshift linkage and primary drive gear (Section 8)
- Alternator, flywheel (Section 9)
- Starter motor (Section 18)
- Neutral switch, oil pressure switch (Section 19)
• Be careful not to damage the crankcase mating surface.
• When disassembling, mark and store the disassembled parts to ensure that they are reinstalled in their original locations.
• Connecting rod bearing inserts are select fitted and are identified by color code. Select the replacement bearings using
the selection tables. After installing new bearings, recheck them with plastigauge to verify correct clearance.
• Clean and apply sealant to the crankcase mating surfaces. Wipe off excess sealant thoroughly.
SPECIFICATIONS
Unit: mm (in)
ITEM STANDARD SERVICE LIMIT
Crankshaft Side clearance 0.05 - 0.20 (0.002 - 0.008) 0.30 (0.012)
Runout - - 0.03 (0.001)
Crank pin oil clearance 0.028 - 0.052 (0.0011 - 0.0020) 0.07 (0.003)
Main journal oil clearance 0.030 - 0.046 (0.0012 - 0.0018)
0.07 (0.003)
Transmission Gear I.D. M3, M5 28.000 - 28.021 (1.1024 - 1.1032) 28.04 (1.104)
C1, C2, C4
31.000 - 31.025 (1.2204 -1.2215) 31.05 (1.222)
Bushing a.D. M3, M5 27.959 - 27.980 (1.1007 - 1.1016) 27.94 (1.100)
C1, C2, C4
30.950 - 30.975 (1.2185 - 1.2195) 30.93 (1.218)
Bushing I.D. M3 25.000 - 25.021 (0.9843 - 0.9851) 25.04 (0.986)
C2 27.995 - 28.016 (1.1021 - 1.1030) 28.04 (1.104)
Gear-to-bushing M3, M5 0.020 - 0.062 (0.0008 - 0.0024) 0.10 (0.004)
clearance
C1,C2,C4 0.025 - 0.075 (0.0010 - 0.0030) 0.11 (0.004)
Mainshaft G.D.
M3 bushing
24.972 - 24.993 (0.9831 - 0.9840) 24.95 (0.982)
Case journal A 19.980 - 19.993 (0.7866 - 0.7871) 19.96 (0.786)
Case journal B 21.967 - 21.980 (0.8648 - 0.8654) 21.94 (0.864)
Countershaft a.D. C2 bushing 27.967 - 27.980 (1.1011- 1.1016) 27.95 (1.100)
Case journal A 27.972 - 27.990 (1.1013 -1.1020) 27.95 (1.100)
Case journal B 19.980 - 19.993 (0.7866 - 0.7871) 19.96 (0.786)
Bush ing-to-shaft M3 0.007 - 0.049 (0.0003 - 0.0019) 0.08 (0.003)
clearance
C2 0.0.15 - 0.049 (0.0006 - 0.0019) 0.08 (0.003)
Shift fork, fork Fork
!.D.
13.000 - 13.021 (0.5118 - 0.5126) 13.04 (0.513)
shaft
Claw thickness 5.93 - 6.00 (0.233 - 0.236) 5.6 (0.22)
Fork shaft G.D. 12.966 - 12.984 (0.5105 - 0.5112) 12.90 (0.508)
Shift drum a.D. (at left side journal)
11.966-11.984 (0.4711-0.4718) 11.94 (0.470)
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