Checking Connecting Rod Bearing Clearance; Oil Seals - Onan T260G Service Manual

CHECKING CONNECTING ROD BEARING
CLEARANCE WITH PLASTIGAUGE
1.
Make certain that all parts are marked or identified
so that they are reinstalled in their original positions.
Using a clean dry cloth, thoroughly clean all oil from
crankshaft journal and connecting rod.
2. Place a piece of correct size Plastigauge in the
bearing cap the full width of the journal surface and
about 1/4 inch (6.35 mm) off center (Figure 24).
3. Rotate the crankshaft about 30 degrees from bottom
dead center and reinstall the bearing cap; tighten
rod bolts to the torque specified in ASSEMBLY
TORQUES AND SPECIAL TOOLS. Do not turn the
crankshaft.
4. Remove bearing cap. The flattened Plastigauge will
be found adhering to either the bearing cap or
crankshaft.
5. Compare flattened Plastigauge with the graduations
on Plastigauge envelope
to
determine clearance.
The number within the matching graduation on the
envelope indicates total clearance in millimetres or
thousandths of an inch.
FRONT
GEAR COVER
OF GEAR COVER
MOUNTING FACE
THIS GEAR COVER SURFACE
SHOULD BE CLEANED OF ALL
OLD SEALING COMPOUND
BEFORE INSTALLING
S E A L .
GEAR
COVER OIL SEAL
FIGU'RE
24.
MEASURING BEARING CLEARANCE
OIL SEALS
The bearing plate must be removed to replace the oil
seal (Figure 25). Drive the oil seal out from the inside.
Before installing seals, fill the space between lips with a
multi-purpose grease. This will improve sealing.
When installing the gear cover oil seal, tap the seal
inward until it is .645 inch
(1
6.4 mm) from the front of the
gear cover.
When installing the bearing plate oil seal, tap the seal
into the bearing plate bore to bottom against the
shoulder in the plate bore. Use a seal expander or place
a piece of heavy paper around the end of the crankshaft,
when replacing the bearing plate to avoid damaging the
seal. Remove the paper as soon as the plate is in place.
REAR BEARING PLATE
THIS SURFACE SHOULD BE
CLEANED OF ALL OLD
SEALING COMPOUND
BEFORE INSTALLING
S E A L .
DRIVE
OR PRESS OIL
SEAL TO SHOULDER
OF THE PLATE BORE
REAR BEARING PLATE
OIL SEAL
-1163
FIGURE
25.
GEAR COVER AND REAR BEARING PLATE OIL SEALS
10-15