Page 52
(2) If oil pressure is below about 10 psi, shut
engine down immediately. A problem exists
in the engine lubrication system. Refer to
Service Manual, Generac P/N 0F6923 for
engine service recommendations.
Note: The oil pressure switch is rated at 10 psi for
single cylinder engines.
3. Remove the oil pressure gauge and reinstall the oil pres-
sure switch. Do NOT connect Wire 86 or Wire 0 to the
switch terminals.
a. Set a voltmeter to measure resistance.
b. Connect the meter test leads across the switch
terminals. With engine shut down, the meter
should read CONTINUITY.
c. Crank and start the engine. The meter should
read INFINITY.
d. Connect one test lead to Wire 0 ( disconnected from
LOP). Connect the other test lead to a clean frame
ground. CONTINUITY should be measured. If CON-
TINUITY is NOT measured repair or replace Wire 0
between the LOP and the ground terminal connec-
tion on the engine mount.
4. If the LOP switch tests good in Step 3 and oil pressure is
good in Step 2, but the unit still shuts down with a LOP
fault, check all wiring connections between the START-
STOP-RUN switch and the LOP pressure module and
the LOP sender for a short to ground. Any ground on
this wire will cause Wire 18 to receive a ground also
inhibiting spark from occurring. If a short to ground is
found replace the respective wire.
RESULTS:
1. If LOP switch, oil pressure and wiring all test good, refer
back to flow chart.
2. If the LOP switch failed, replace the switch.
3. If no pressure was measured, an internal failure of the
oil pump may have occurred.
TEST 49 – TEST RECOIL FUNCTION
PROCEDURE:
1. Attempt to pull start the engine and make the following
observations while doing so.
a. Does the cord pull easily and smoothly?
b. Does the cord return with no assistance?
c. Does the engine turn over as the cord is
pulled?
RESULTS:
If the recoil did not perform as the observations are
stated above, possible problems that could be present
are:
• Onthe410ccenginethecompressionreleasevalve
could be broken.
• Theenginecouldbeseized.
• The recoil could have become detached from the
flywheel.
• The recoil mechanism could be broken and not to
properly retracting back into the engine.
TEST 50 – TEST ENGINE FUNCTION
PROCEDURE:
1. Remove the recoil and front cover assembly.
2. Remove the spark plug from the unit.
3. Attempt to turn the engine over by hand.
RESULTS:
1. If the engine can not turn over freely with the spark plug
removed, the engine has suffered some type of internal
failure that has seized it and is inhibiting it from running.
2. Refer back to flow chart.
PART 3
DC CONTROL
SECTION 3.3
DIAGNOSTIC TESTS
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