50
TK 56433-5-MM-EN
Figure 49.
Adjusting the Valve Clearance
6.
Hold the adjustment screw in place and tighten the
locknut.
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.
Valve Adjustments and Cylinder Configurations
Rear Flywheel
End
Front Pulley End
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
Crankcase Breather
Gases formed in the crankcase are directed to the
intake manifold. 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.
The crankcase breather is located in the valve cover. A
restrictor is cast into the fitting for the breather hose on
the intake manifold. The restrictor limits the flow of
gases from the crankcase to the intake manifold and
keeps the crankcase pressure from getting too low in
vacuum. A breather hose connects the crankcase
breather to the intake manifold.
Figure 50.
Crankcase Breather
1.
Breather Hose
5.
Baffle Breather
2.
Insulation
6.
Baffle Plate
3.
Breather Cover
7.
Intake Manifold
4.
O-Ring
8.
Restrictor Location
Normal crankcase pressures with a new air cleaner are
0 to 12 in. (0 to 300 mm) H
2
O of vacuum. The vacuum
