Shibaura ST330, Workshop Manual

Page: 50 / 250

45
14) Oil pump
Disassembly
Removal from engine
(1) Remove the snap ring.
(2) Take out the collar, spring and shim.
(3) Take out 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 damaged remarkably.
(2) Check the clearance between the rotor and vane and
replace if the service limit (0.25 mm) is exceeded.
(3) Reassemble in the order reverse to disassembly.
➀ Install the crankshaft gear and idle gear aligning the
match mark.
➁ Adjust the side clearance of the rotor and vane to 0.1 –
0.15 mm . (See the assembling order 13, 164Y.)
15) Oil filter
Structure and Functions
(1) The cartridge type oil filter is excellent in filtering
performance.
(2) Since it is of the full-flow type, when the filter is clogged,
the safety valve is opened to allow the oil to flow,
preventing seizure or other troubles.
(3) The oil fed under pressure with the oil pump enters Ⓐ is
filtered by the element, and supplied to each part from Ⓑ .
When the element is clogged, the oil is supplied to each
part without passing through the element.
Replacement
(1) Replace the oil filter every 200 hours of operation.
(2) Coat the filter mounting surface with oil and tighten the
filter by hand.
(3) Do not reuse the filter if it is removed once.
139Y
140Y
141Y
5. Idle gear ass’y
6. Oil pump cover
7. Spring
8.
Snap ring
1. Collar
2. Shim
3. Rotor
4.
Thrust washer