Crankshaft Journal Bearing Inspection And Selection - Suzuki GSX-R750 Service Manual

Crankshaft Journal Bearing Inspection and
Selection
Refer to "Engine Bottom Side Disassembly (Page 1D-
47)".
Refer to "Engine Bottom Side Assembly (Page 1D-55)".
Inspection
1) Inspect each upper and lower crankcase bearing for
any damage.
2) Set the crankshaft onto the upper crank case.
3) Install the plastigauge onto each crankshaft journal
as shown in the figure.
Special tool
(A): 09900–22301 (Plastigauge (0.025 –
0.076 mm))
NOTE
Do not place the plastigauge on the oil hole.
4) Mate the lower crankcase with the upper crankcase.
B838H21406043
I837H1140188-01
I837H1140189-01
(A)
I837H1140190-01
5) Tighten the crankshaft journal bolts (M9). Tighten
each bolt a little at a time to equalize the pressure in
the following two steps.
NOTE
Do not rotate the crankshaft when a piece of
plastigauge is installed.
Tightening torque
Crankshaft journal bolt (M9): 18 N⋅m (1.8 kgf-m,
13.0 lb-ft) then turn in 50 degree turn
6) Remove the lower crankcase and measure the width
of compressed plastigauge using the envelope
scale. This measurement should be taken at the
widest part of the compressed plastigauge. If the oil
clearance exceeds the service limit, select the
specified bearings from the bearing selection table.
Crankshaft journal oil clearance
Standard: 0.010 – 0.028 mm (0.0004 – 0.0011 in)
Crankshaft journal oil clearance
Service limit: 0.080 mm (0.0031 in)
Engine Mechanical: 1D-81
I838H1140072-01
I837H1140192-01