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Engine Maintenance
65
a. Rotate the engine in the normal direction
of rotation (clockwise viewed from the
water pump end) until the 1-4 timing mark
on the flywheel lines up with the index
mark in the timing mark access hole.
b. Check the rocker arms on the number one
cylinder to see if they are loose.
c. If the rocker arms are loose, the engine is
at top dead center of the compression
stroke for the number one cylinder.
d. If the rocker arms are tight, the engine is at
top dead center of the exhaust stroke for
the number one cylinder. Rotate the engine
360 degrees to place the engine at top dead
center of the compression stroke for the
number one cylinder.
4. Use a feeler gauge to check the valve
clearance on both valves for the number one
cylinder, the intake valve for the number two
cylinder, and the exhaust valve for the number
three cylinder. The valve clearance for both
the intake valve and the exhaust valve should
be 0.006 to 0.010 in. (0.15 to 0.25 mm).
NOTE: Check to make sure that the valve
stem cap is in good condition and is
positioned squarely on the top of the valve
stem. Replace the valve stem cap if it shows
significant wear.
5. Adjust the valves if necessary by loosening
the locknut and turning the adjustment screw
until the valve clearance is correct.
6. Hold the adjustment screw in place and
tighten the locknut.
Figure 40: Adjusting the Valve Clearance
7. Recheck the valve clearance.
8. Rotate the engine one full turn (360 degrees)
in the normal direction of rotation (clockwise
viewed from the water pump end), and align
the 1-4 timing mark on the flywheel with the
index mark in the timing mark access hole.
This is top dead center of the compression
stroke for the number four cylinder.
9. Check and adjust the exhaust valve for the
number two cylinder, the intake valve for the
number three cylinder, and both valves for the
number four cylinder.
10. Replace the rocker arm cover, the cover for
the timing mark access hole, and tighten the
fuel injection lines when finished.
AEA705
Valve Adjustments and Cylinder Configurations
Front
Rear
Cylinder Number
1
2
3
4
Valve arrangement
E
I
E
I
E
I
E
I
Piston in No. 1 cylinder is at
TDC on compression stroke
Piston in No. 4 cylinder is at
TDC on compression stroke
Summary of Contents for Spectrum DE 30-2
Page 4: ...4...
Page 12: ...Safety Precautions 12...
Page 16: ...Specifications 16...
Page 31: ...Unit Description 31 1 Access Panels 2 Defrost Dampers Figure 12 Back View of Unit 1 2 AGA215...
Page 42: ...Operating Instructions 42...
Page 48: ...Electrical Maintenance 48...
Page 106: ...Structural Maintenance 106...
Page 110: ...Mechanical Diagnosis 110...
Page 114: ...Remote Evaporator Specifications 114...
Page 116: ...Remote Evaporator Maintenance Inspection Schedule 116...
Page 122: ...Remote Evaporator Electrical Maintenance 122...
Page 126: ...Remote Evaporator Refrigeration Service Operations 126...
Page 128: ...Remote Evaporator Structural Maintenance 128...
Page 130: ...Remote Evaporator System Diagnosis 130...
Page 134: ...Wiring and Schematic Diagrams Index 134...
Page 135: ...135 Schematic Diagram Page 1 of 2...
Page 136: ...136 Schematic Diagram Page 2 of 2...
Page 137: ...137 Wiring Diagram Page 1 of 4...
Page 138: ...138 Wiring Diagram Page 2 of 4...
Page 139: ...139 Wiring Diagram Page 3 of 4...
Page 140: ...140 Wiring Diagram Page 4 of 4...