Onan DJA Series User Manual

LOCK PIN
THRUST WASHER
ALIGN OIL HOLES
REAR BEARING PLATE
MAIN BEARING
MUST BE FLUSH WITH
INSIDE SURFACE
LOCK PIN
FRONT
OIL SEAL -
INSTALL FLUSH
WITH OUTSIDE
.SURFACE
LIP FACING
OUT
REAR
FIGURE 52. MAIN BEARING INSTALLATION
1. Almen gauge reading, 0.012-A.
2. Peen with 0.019-inch diameter cast steel shot.
3. Peen for 15 seconds on each crankpin fillet.
4. Mask off connecting rod bearing areas.
Undersize bearings and connecting rods are available
to rework the shaft to 0.010-inch, 0.020-inch and 0.030-
inch undersize.
MAIN BEARINGS
Replace main bearings if clearances are greater than
limits, or the bearings are worn, grooved or broken.
See Figure 52.
Precision replacement bearing inserts and thrust wash-
ers are available for all main bearings. Do not ream the
bearings. Align the oil holes and press the new bear-
ings into the front and rear housings.
REAR OIL SEALS
The rear oil seal is in the rear bearing plate. If damag-
ed, drive it out from the inside of the plate. Using
the oil seal installing tool, install a new seal with the
rubber lip facing outward (open side of seal inward).
See Figure 47. Drive the new seal flush with the rear
surface of the bearing plate. Leave the seal installer
on during bearing plate installation to protect the oil
seal.
Installation: After each installation step, check
crankshaft to be sure it is not frozen into place.
the
1.
2.
Press the front and rear main bearings into place,
aligning the bearing and bearing housing oil holes.
Do not attempt to drive a bearing into a cold block
or rear bearing plate.
Install the thrust washers and locking pins.
3. Oil the bearing surfaces and install the crankshafv.
from the rear of the crankcase, through the rear
bearing plate hole.
4. Mount and secure the rear bearing plate.
5. Heat the timing gear on an electric burner or oven
to about 350
0
F. Install the key on the crankshaft,
then drive the gear into placf:. Install the retaining
washer and lock ring.
6. Check the crankshaft end play. Use enough rear
bearing plate, gaskets or shim and gaskets to pro-
vide 0.010-inch to 0.015-inch end play. If gaskets
BOLT TIGHTENING SEOUENCE

Onan DJA Series Specifications

General

Brand	Onan
Model	DJA Series
Category	Engine
Language	English