TOHATSU BFT115A Service Manual page 490

CYLINDER BLOCK
CONNECTING ROD BEARING OIL
CLEARANCE
To check connecting rod bearing-to-crank pin oil
clearance, remove the connecting rod bearing caps,
crankshaft, and connecting rod bearings (page 15-15).
Clean each crank pin and connecting rod bearing and
check for wear or damage.
Set the crankshaft to the cylinder block, install the
connecting rod caps and tighten the connecting rod
bolts to the specified torque (page 15-24).
Remove the bearing caps and place one strip of
plastigauge (1) across each crank pin.
• Set the plastigauge in the axial direction.
• Avoid the oil passage in the crank pin when setting
the plastigauge.
Reinstall the connecting rod caps and tighten the
connecting rod bolts to the specified torque (page 15-
24).
• Tighten the connecting rod bolt with care not to turn
the crankshaft and/or the connecting rod.
Remove the connecting rod cap and measure the
pressured width (2) of the plastigauge using the scale
(3) printed on the plastigauge's bag.
• Take the largest width on the plastigauge.
STANDARD:
0.020 – 0.050 mm (0.0008 – 0.0020 in)
SERVICE LIMIT:
0.060 mm (0.0024 in)
If the measurement exceeds the service limit, replace
the bearings by referring to connecting rod bearing
selection table (page 15-43) and measure the oil
clearance again.
If the measurement still exceeds the service limit,
replace the crankshaft with a new one (page 15-15) and
recheck.
15-42
(1)
(2)
(3)