6.
7.
8.
9.
10.
11.
When disassembling engine, mike bearing plate
gasket thickness. Then select proper shim thick-
ness for correct end play.
Shims establish end play. Only one thickness gasket
is
included in kit.
When assembling crankshaft, make sure bearing
thrust washers are in proper position supported
by bearing stop pins. Use cup grease to hold in
place.
When adjusting valve lash, tap rocker arm
so
it is
straight when checking with feeler gauge.
Crank gears are easier
to
remove and install if
heated a slight amount.
Do
not
overheat
or
temper
may
be
lost
and shaft may expand.
See
FUEL
SYSTEM
section for correct engine
timing.
Allow some gear lash, approximately
0.005
inch
(0.13mm) in oil pump.
Donot
installgears tightly
against each other!.
Maintenance
Check the valve clearances at regular intervals (see
OPERATORS
MANUAL).
In addition, clean the com-
bustion chambers and valve seats, as required if
engine loses power or has low compression.
Valve Clearance Adjustments
After engine has reached a stable temperature condi-
tion the valve clearances may be adjusted. It is
recommended that the valve clearance be set with
engine at room temperature (about
75OF
[24O
C]).
Allow at least two hours cooling time after engine
operation.
1.
To
adjust valve clearance on two-cylinder
J
Ser-
ies engine proceed as follows:
A.
Turn flywheel until cylinder which
is
to have
'its valve adjusted is on a compression stroke,
which follows closing
of
intake valve.
B.
Turn flywheel until TC (top center) mark
on
flywheel lines up with timing pointer on gear
cover. Then turn flywheel in
a
clockwise
direction for an additional 10 to 45 degrees.
The timing mark for this position must be
established. In this position, the piston will be
in its Dower stroke with both valves com-
TESTING AND ADJUSTING ENGINES
pletely closed.
C.
Using a feeler gauge, check clearance between
rocker arm and valve, Figure 100. Increase or
reduce clearance until proper gap is estab-
lished; adjust with lock nut which secures
rocker arm to cylinder head, Figure
101.
Refer
to
SPECIFICATIONS
for correct valve clear-
ance setting for your particular engine.
Preparation
Check the following:
1. Put proper oil in crankcase.
2.
Service air cleaner.
3.
Connect fuel line.
4.
Connect load.
5.
Connect fully charged battery.
6.
Check ventilation for proper cooling.
Operation
1.
Start engine
-
(see Diesel Starting Guide).
2.
Check oil pressure.
3.
Run unit 15 minutes to bring
it
up to operating
temperature.
4.
Check for oil leaks, loose electrical connections,
tight fuel lines,and tight exhaust connections.
Adjust valve lash after
50
hours
of
operation following
engine overhaul.
\\
EXHAUST
A67a-2
'
FIGURE
100. CHECKING VALVE CLEARANCES
Adjust
men
ts
Adjust governor for speed and sensitivity.
2.
To
adjust valve clearance on four-cylinder
J
Ser-
ies engine proceed as follows:
A.
Adjust valve clearance
in
firinn order (1-2-4-
3)
sequence. After the coolinfperiod,'adjust
number
1
cylinder according to Steps 1A and
1
B.
After timing the number
1
cylinder, adjust
valve clearance according to Steps
1
C.
IMPORTANT: For complete customer satisfaction, repaint unit
(Onan White, spray can 5259216) and apply insfructions from
Marine Kit.
Redistribution or publication of this document,
by any means, is strictly prohibited.
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