3-14 109823 2/09
Oil pump
Disassembly
Removal from engine
1. Remove the snap ring.
2. Remove the collar, spring and shim.
3. Remove the idle gear, vane, and oil pump cover
together.
4. Extract the rotor and thrust washer.
5. Extract the oil pump cover from the idle gear.
Inspection and reassembly
1. Check the oil pump cover, rotor and vane and
replace if worn out or excessively damaged.
2. Check the clearance between the rotor and vane and
replace if the service limit 0.0098 in(0.25 mm) is
exceeded.
3. Reassemble in the reverse order of disassembly.
a. Install the crankshaft gear and idle gear aligning
the match mark.
b. Adjust the side clearance of the rotor and vane to
0.0039-0.0059 in(0.1–0.15 mm). (See Fig. 3-36)
Oil filter
Structure and Functions
1. The oil filter is a full flow cartridge type.
2. When (if) the filter is clogged the safety valve opens
and allows oil to flow, preventing seizures and other
engine related problems.
3. Oil, fed under pressure from the oil pump, enters at
point (A), is filtered by the element, and supplied to
the lubrication system from point (B). When the
element is clogged, the oil bypasses the filter
element.
Replacement
1. Replace the oil filter after first 50 hours and every
100 hours of operation thereafter.
2. Coat the filter mounting surface with oil and tighten
the filter by hand.
3. For engines with remote mounted oil filters, fill filter
with oil prior to installation.
4. Do not reuse the filter.
Fig. 3-35
1. Collar
2. Shim
3. Rotor
4. Thrust washer
5. Idle gear assembly
6. Oil pump cover
7. Spring
8. Snap ring
Fig. 3-36
Fig. 3-37
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