Onan DJA Series User Manual

PRESS BEARING
FLUSH WITH
BOTTOM OF
RECESS
«- REAR
BEARING
^32-16
PRESS BEARING
FLUSH WITH
FRONT CRANK-
CASE SURFACE
ALIGN OIL
HOLES
FRONT
BEARING
FIG. 13-4
and drives it at 1/2 the crankshaft speed. To remove the
gear, use a hollow tool or pipe that will fit inside the gear
bore and over the center pin. Press the camshaft out of the
gear bore. Be careful not to damage the center pin.
Camshaft Bearings: The camshaft bearings should be
replaced if the clearance to the camshaft is greater than
specified, the bearings show cracks, breaks, burrs, exces-
sive wear, or other defects. The camshaft to bearing clear-
ance should be.0012" to.0037". To check the rear bearing,
remove the expansion plug at the rear of the crankcase.
Press new bearings into place (Fig. 13-4). Press the rear
bearing flush with the bottom of the expansion plug recess.
Press the front bearing in flush with the crankcase front
surface so the oil passages are aligned. Do not attempt to
ream the bearings, they are a precision type. After the rear
bearing is installed, insert a new expansion plug in the
recess, using sealing compound, and expand it into place
with sharp blows at its center.
SPACER-i
WASHERS |M
CAMSHAFT
GEAR rrf
m
CAMSHAFT
PRESSED IN
r
i MEASURE END PLAY
HERE
CRANKSHAFT
WASHER
... ^itflSPSS-T'. • •
CRANKSHAFT^
PULLED OUT
-CRANKSHAFT
GEAR
FIG. 13-5
Installation, Cam shaft Assembly:
1. Install thekey and press the camshaft gear on its shaft.
2. Install the governor components.
3. Slide the thrust washer onto the shaft.
4. Lay the engine on side or end and insert the push rod
tappets.
5. Install the camshaft assembly in the engine. Align the
timing marks on the camshaft gear and crankshaft gear
(Fig. 13-6).
6. Replace the push rods and fuel transfer pump.
7. When the engine is reassembled, install the injection : •
pump, following the steps for Injection Pump Instal- '
lation. This step is critical.
CRANKSHAFT
These engines use a counterbalanced, ductile iron crank- .
shaft. To increase the shafts fatigue durability, all crankpin
fillets are shot-peened during manufacturing. The crankshafts
ride on two lead-bronze bearings, the front one housed in the
crankcase and the rear one in the bearing plate.
Removal:
1. Remove the lock ring and retaining washer in front of
THESE MARKS
MUST COINCIDE
WHEN INSTALLING
TIMING GEARS
I12S6-I
FIG. 13-6
37

Onan DJA Series Specifications

General

Brand	Onan
Model	DJA Series
Category	Engine
Language	English