ENGINE
ADJUSTMENTS
~,~
.
NOTE:
UNIVERSAL recommends that 'the following engine
·
~adjustments
be performed by a competent engine mechanic.
The
information below is provided to assist the mechanic.
THROTILE
AND
STOP
CONTROLS
MODEL
M3-208
THROTTlE
CONTROl
MODELS
M-258,
M-358
MODEL
M-508
THROTTlE
lEVER
THROTTLE
AND
STOP
ASSEMBLY
The throttle and engine stop levers are located on the out-
board side
of
the engine just below the fuel injection pump.
Brackets are provided for owner-installed push-pull cables
that run to the steering station. The throttle high speed
adjustment has been factory set and is wire locked. The throt-
tle idle screw
is
adjustable. These levers and brackets should
be periodically lubricated and checked for loose fastenings.
VALVE
CLEARANCE
NOTE: Valve adjustment should not be necessary under
normal operating conditions. These adjustments, when
required, should be
performed by an authorized mechanic.
Remove the valve rocker cover to expose the engine's valve
train. Remove the glow plugs from each
of
the cylinders
to
enable the engine to be easily rotated by hand to position
each cylinder for valve adjustment.
Valves are adjusted with the piston in the cylinder being
adjusted at TDC (Top Dead Center)
of
its compression
stroke. Each cylinder is adjusted following the engine's firing
order.
FIRING
ORDER
3
CYLINDER
MODELS
4
CYLINDER
MODELS
1-2-3
1-3-4-2
Adjust the valves beginning with Cylinder #1. Rotate the
crankshaft slowly and observe the operation
of
the valves for
Cylinder
#1. Watch for the intake valve to open indicating
the piston is on its intake stroke (the piston is moving down
in the cylinder). Continue to rotate the crankshaft slowly and
look for the intake valve to close. The piston is now starting
its compression stroke (the piston is moving up in the
cylinder towards TDC).
Watch the timing hole in the bell housing for timing numbers
to appear. Position the ITC Mark in_alignment with the notch
in the timing hole. The piston in Cylinder
#1
is
now at TDC.
Adjust the valves in Cylinder #1. Proceed to the next cylin-
der in the
firing order.
Three
Cylinder
Models
Rotate the crankshaft
240
degrees in the normal direction
of
rotation and adjust the #2 cylinder's valves. Rotate the crank-
shaft another
240
degrees and adjust the #3 cylinder's valves.
Four
Cylinder
Models
Rotate the crankshaft 180° in the normal direction
of
rotation
and adjust the #3 Cylinder's valves. Rotate the cr.ankshaft
another
180° and adjust the
#4
Cylinder-'s valves. Rotate the
crankshaft another 180° and adjust the #2 Cylinder's valves .
.
SOME
MODELS
~
HAVE
A
COVER
OVER
THE
HOLE
II'
VALVE
CLEARANCE
[COLD
ENGINE)
0.0071
-
0.0087
IN
[0.18-
0.22mml
..__.__
_
_._
M-508
0.0057-
0.0072
IN
[0.145-
0.185mml
M3-208,
M·25XP8
M-358,
M-408
.
..,Unlvanal
*
,tM;illljQ•M@;W
27
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