Thermo King SB-III 30 SR+, Manual

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Engine Maintenance (Rev. 04/02)
50
7. Hold the adjustment screw in place and tighten the lock
nut.
Adjusting the Valve Clearance
8. Recheck the valve clearance.
9. Rotate the engine one full turn (360°) in the normal
direction of rotation (clockwise viewed from the water
pump end), and align the 1-4 timing mark on the fly-
wheel with the index mark in the timing mark access
hole. This is top dead center of the compression stroke
for the number four cylinder.
10. 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.
11. Replace the rocker arm cover, the cover for the timing
mark access hole, and tighten the fuel injection lines
when finished.
aea705
CRANKCASE BREATHER
The crankcase breather is located on top of the rocker arm
cover. The crankcase breather system ducts crankcase gases
formed in the crankcase directly to the air intake. Harmful
vapors that would otherwise collect in the crankcase and
contaminate the oil, or escape to the outside, are drawn back
into the engine and burned.
Normal crankcase pressures with a new air cleaner are 0 to
1 in. (0 to 25 mm) H
2
O of vacuum at 1450 rpm and 1 to 2
in. (25 to 51 mm) H
2
O of vacuum at 2200 rpm. The vacuum
will increase as the air cleaner gets dirty and becomes more
restrictive. The crankcase breather and the breather hose
should be inspected yearly to make sure they are not
plugged or damaged.
1. Air Restriction Indicator
2. Restrictor
3. Crankcase Breather
4. Intake Manifold
Crankcase Breather
4
1 2 3