Honda C65 - Lubrication System; Oil Pump Disassembly; Oil Pump Principle

E
= -.e right crank-
lub ric ate the
assoc· ~ed po ts.
- - case ! upper por of the oil pump)-+
-=-;- - e cyl i der stud bol t (r ig ht lower s id e)
- -:::~ e rocl: er ar m si de cover-+sprayed from
--e f ur oil hol es in the c amshaft-+to lubricate
·-e res pe ctiv e sect io ns of t he cylinde r head-+
·n o the o il return hole at the l ower end of the
exhaust valve
and returns to the cra nkcase.
Th e oil t hat passes through the cams haf t lubricates
he c am chain and returns to the crank case.
In this way, the lubr ication of the engine is per-
f ormed by the two oil routes and the oil spray
in
the crankcase. (Fig. 3- 10)
5. OIL PUMP PRINCIPLE
In th e past, gear type o il pump using two gears
were used, however, on these models a more efficien t
and compact trochoid oil pump is used. This pump
consists
of an inner and an outer rotor. Th e pumping
action is produced by the differe nces in the shape
and number of the teeth between the inner and the
outer r otors . (Fig. 3-11)
a. Disassembly
( 1) Remove the clutch assembly as d escribed in
section 3. 14a.
(2)
Rem ove the thr ee 6mm bolts and remove the oil
pump as a unit. (Fig. 3- 12)
G l N E
Figure 3-10 . Pr ess u re lu br ica t ion di agram
Outlet
Figure 3- 11.
O il pump theo ry of opera i on
Fi gure 3- 12. Di sassem bly ing the oi l pump