ENGINE
D. LUBRICATING SYSTEM
a. Checking
(A) Engine Oil Pressure
1. Remove the oil pressure switch and install
adaptors and pressure tester.
2. Start the engine and run it until it is warmed up,
and measure the oil pressure both at idling and
rated speed.
3. If the oil pressure is less than the allowable limit,
check the amount of oil, oil filter, oil pump relief
valve, oil passages and oil clearance.
( R e f e r e n c e )
(B) Oil Filter and Relief Va l v e
1. Drain the engine oil and remove the oil filter to
check it.
2. Check the relief valve for dirt, and the seat (2) and
ball (1) for damage.
3. If damaged, replace.
4. Check the free length of spring (3).
5. If less than the allowable limit, replace.
NOTE :
• Install the relief valve cover with the mark up.
(1) Relief Valve Ball
(3) Relief Valve Spring
(2) Relief Valve Seat
1.5 to 2.0kgf•m
Tightening
Oil presure
14.7 to 19.6N•m
torque
switch
10.8 to 14.5ft-lbs
3.3 to 3.7kgf•m
Tightening
Relief
32.4 to 36.3N•m
torque
cover
23.9 to 36.8ft-lbs
Factory
35mm
Spring free spec.
1.38in.
length
Allowable
30mm
limit
1.18in.
more than 49 kPa
Factory
0.5kgf/cm2
spec.
7.11psi
294 to 441mm
At idle
Factory
3.0 to 4.5kgf/cm2
speed
spec.
42.7 to 64.0psi
255kPa
Allowable
2.4kgf/cm2
limit
35.6psi
Piston
ring
c l e a r a n c
e
