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28 OM-402
7.6 Adjusting Engine Speed
After tuning engine, check engine
speeds with a tachometer (see table
for no load speeds). If necessary,
adjust speeds as follows:
Start engine and run until warm.
Idle Speed Adjustment
Turn Engine Control switch to Run/
Idle position.
1 Idle Speed Lock Nut
2 Idle Speed Screw
Loosen nut. Turn screw until engine
runs at idle speed. Tighten nut.
Weld/Power Speed Adjustment
Turn Engine Control switch to Run
position.
3 Weld/Power Speed Lock Nut
4 Weld/Power Speed Screw
Loosen nut and back out screw.
5 Linkage Lock Nut
6 Linkage
Loosen nut and turn linkage until
engine runs 50 rpm above specified
weld/power speed. Tighten linkage
lock nut.
Turn weld/power speed screw until
engine runs at weld/power speed.
Tighten nut.
Y Stop engine.
Shutdown Adjustment
. Shutdown mechanism normally
does not require adjustment un-
less tampered with.
7 Shutdown Linkage Lock Nuts
8 Shutdown Linkage Rod
Loosen nuts. Turn rod until
measurement between swivels is
3 in (76 mm). Tighten nuts.
9 Shutdown Lever Lock Nut
10 Shutdown Lever Adjust Nut
11 Shutdown Lever Screw
12 Shutdown Lever
Loosen nuts. Back screw out and
away from lever. Turn lever
clockwise until lever hits internal
stop. Tighten adjust nut until screw
hits lever, then tighten adjust nut
another 1-1/2 turns to bring lever off
internal stop. Tighten nuts.
Ref. ST-159 215-E
3
12
Tools Needed:
5/16, 3/8, 7/16 in,
10 mm
3700 rpm
2200 rpm
4
6
5
11
7
7
8
12
3 in
(76 mm)
10 9
Leave no
space
between
nuts.