Adjustments
Valve Clearance
1.
decks, stop engine, engage parking brake and remove
key from the ignition switch.
Park machine on a level surface, lower cutting
8. Install valve cover to engine (see Valve Cover Instal-
lationintheServiceandRepairssectionofthischapter).
9.
Lower and secure hood.
2.
Raise and support hood.
3.
RemovalintheServiceandRepairssectionofthischap-
ter).
Remove valve cover from engine (see Valve Cover
4.
deadcenter(TDC)attheendofthecompression stroke:
Position engine crankshaft so cylinder #1 is at top
2
3
A. While watching the movement of the cylinder #4
intakevalve,rotateengine crankshaftinnormalrota-
tion direction (clockwise). When the cylinder #4 in-
take valve starts to open, cylinder #1 is approaching
TDC at the end of the compression stroke.
1
Figure 1
1.
2.
Crankshaft pulley
Tone wheel cutout
3.
TDC indicator
B. Continue rotating the crankshaft in the normal
rotation direction (clockwise) until the cutout in the
tone wheel attached to the back of the crankshaft
pulleyalignswith“1.4TOP”castinenginefrontcover
(Fig. 1).
2
3
1
4
5.
intakevalvesforcylinders#1and#3andexhaustvalves
for cylinders #1 and #2 (Fig. 2 and 3).
In this crankshaft position, adjust valve clearance for
A. Loosen thelocknutontherocker armadjustment
screw.
B. Insert correct feeler gauge between the valve
stem and the rocker arm. Intake valve clearance
specification is 0.014” (0.35 mm). Exhaust valve
clearance specification is 0.020” (0.50 mm).
Figure 2
1.
2.
Lock nut
3.
4.
Rocker arm
Valve clearance
Adjustment screw
C. Adjust screw until a slight drag is felt on the feeler
gauge.
8
6
4
2
D. Hold adjustment screw in position and tighten
lock nut to secure valve clearance adjustment.
Torque lock nut from 29 to 36 ft--lb (39 to 49 N--m).
E. After tightening lock nut, re--check valve clear-
ance.
6.
(clockwise) one complete revolution. The tone wheel
cutout should again be aligned with “1.4 TOP”.
Rotate crankshaft in the normal rotation direction
7
5
3
1
Figure 3
7.
In this crankshaft position, adjust valve clearance for
1.
2.
3.
4.
#1 intake
5.
6.
7.
8.
#3 intake
intakevalvesforcylinders#2and#4andexhaustvalves
for cylinders #3 and #4. Follow procedure under step 5
above.
#1 exhaust
#2 intake
#3 exhaust
#4 intake
#2 exhaust
#4 exhaust
Groundsmaster 5900/5910
Page 3 -- 7
Diesel Engine
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