III. Engine Servicing Procedures
U
L-Series Diesel 21
Valve Adjustment
Bring the engine up on number one compression stroke. Verify the position by checking for
clearance in-between the valve stem tip and the rocker arm.
NOTE: Valves can be adjusted
beginning with #1 or #3 (3L) or #4 (4L). This adjustment can only be made with a cold
engine.
3L Engines
Cylinder Number
1
2
3
Valve Arrangement
I
E
I
E
I
E
Valve Numbers
4
4
4
------------
------------
4
4L Engines
Cylinder Number
1
2
3
4
Valve Arrangement
I
E
I
E
I
E
I
E
Valve Numbers
4
4
4
---------
---------
4
---------
---------
Loosen the adjuster jam nut; insert a 0.40 mm (0.016”) feeler gauge in-between the rocker tips
and the valve stems to adjust the valves.
NOTE: Proper adjustment is obtained when there is a
slight drag against the feeler gauge. Jam nut torque is 5.8-8.7 lbs. ft (0.8-1.2 kg m)
Rotate the crankshaft 360
°
(so that the opposing piston is now on its exhaust stroke) and
adjust the remaining valves.
3L Engines
Cylinder Number
1
2
3
Valve Arrangement
I
E
I
E
I
E
Valve Numbers
------------
------------
------------
4
4
------------
4L Engines
Cylinder Number
1
2
3
4
Valve Arrangement
I
E
I
E
I
E
I
E
Valve Numbers
---------
---------
---------
4
4
---------
4
4
Summary of Contents for 3LA
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