8
3
OIL FILL TUBE AND DIPSTICK
The oil fill tube and the dipstick are equipped with an
“O”-ring for proper sealing, Fig. 4.
Note:
a leak at the seal between the tube and sump,
or at the seal at the upper end of the dipstick,
can result in a loss of crankcase vacuum and a
discharge of oil or smoke through the muffler.
Fig. 4
−
Oil Fill Tube And Dipstick
‘‘O”
RING
CHECK PRESSURE SWITCH
Use Digital multimeter, Tool #19464. Set meter to test for
continuity.
Remove pressure switch for testing. Connect one continu-
ity tester lead to the switch terminal and the other tester
lead to the metal body of the switch, Fig. 5. The tester
should indicate continuity when no pressure is applied to
the switch. The switch should open (no continuity) when
approximately 4.5 PSI
(0.3 Bar) is applied. Replace the
switch if test results are not to specification.
Fig. 5
−
Checking Pressure Switch
CHECK OIL PRESSURE
1. Oil level must be between the LOW and FULL mark on
dipstick. If oil level is low, check for leaks and add to
FULL mark.
2. Remove pressure switch or 1/8” NPTF plug in oil filter
adapter.
3. Install oil pressure gauge, Fig. 6.
4. Start and run engine for approximately 5 minutes.
5. Check oil pressure at 3000 RPM.
Oil Pressure @ 70
°
F (21
°
C): 15 ~ 50 psi (1.0 ~ 3.5 Bar)
See chart below for troubleshooting guide.
Low Oil Pressure
Engine RPM Too Low
Wrong Viscosity or Diluted Oil
Low Oil Level
Broken Pressure Relief Spring
Missing Pressure Relief Plunger
Worn Bearings
Damaged Or Defective Oil Pump
Fig. 6
−
Checking Oil Pressure
OIL
PRESSURE
GAUGE
High Oil Pressure
Wrong Viscosity Oil
Plugged Oil Galleries
Stuck Pressure Relief Plunger
TSM
Summary of Contents for 405777 Series
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