FE350 ENGINE
Cylinder Head
Page 13-20 2001 Pioneer 900 Gasoline Vehicle Maintenance and Service Manual
13
VALVE CLEARANCE CHECK AND ADJUSTMENT
No clearance check and no clearance adjustments are required. The FE350 engine is equipped with hydrau-
lic lifters that automatically eliminate all clearance in the valve train components.
BREATHER VALVE (REED VALVE)
General Information
The function of the breather is to create a vacuum in the crankcase which prevents oil from being forced out
of the engine through the piston rings, oil seals or gaskets.
The breather has a reed valve which limits the direction of air flow caused by the piston moving up and down.
Air can flow out of the crankcase, but the one-way reed valve blocks return flow. It thus maintains a vacuum
in the crankcase.
Oil laden air in the crankcase passes through the reed valve and expands into the rocker chamber. In the
rocker chamber most oil separates from the air and drains back to the crankcase. The air passes through a
tube and vents to the intake manifold.
Breather Valve Inspection
1. Inspect the reed valve (1) for sticking or binding. Replace if necessary (Figure 13-38, Page 13-21).
2. Inspect the reed valve for hairline cracks, distortion or breakage. Replace if necessary.
3. Inspect the reed valve (1) seating surface. It must not have any nicks or burrs.
Breather Valve Installation
1. Installation is the reverse of removal. See Breather Valve (Reed Valve) Removal on page 13-12.
NOTE: Place the reed valve on the seat so there is a slight gap (2) 0.008 inch maximum (0.203 mm)
between the valve and the seat (Figure 13-38, Page 13-21).
Figure 13-36 Cylinder Head Assembly
Figure 13-37 Cylinder Head Bolt
Tightening Sequence
1
2
3
4
5
3
6
1
2
4
5
