Checking The Crankshaft; Checking The Crankpin Oil Clearance - SELVA MARINE Blue Whale 250 EFI Service Manual

POWR

Checking the crankshaft

1. Measure the crankshaft journal diameter
a, crankpin diameter b, and crankpin
width c. Replace the crankshaft if out of
specification.
Crankshaft journal diameter a:
62.968–62.992 mm
(2.4791–2.4800 in)
Crankpin diameter b:
49.976–50.000 mm
(1.9676–1.9685 in)
Crankpin width c:
21.50–21.55 mm
(0.8465–0.8484 in)
2. Measure the crankshaft runout. Replace
the crankshaft if above specification.
5-61
Power unit
Crankshaft runout limit:
0.03 mm (0.0012 in)

Checking the crankpin oil clearance

1. Clean the bearings and the connecting
rod.
2. Install the upper bearing into the con-
necting rod 1 and the lower bearing into
the connecting rod cap 2.
NOTE:
• Install the connecting rod bearings in their
original positions.
• Insert the projection a of each bearing into
the slots in the connecting rod cap and con-
necting rod.
3. Put a piece of Plastigauge (PG-1) onto
the crankpin, parallel to the crankshaft.
S6P25970
6P23H11