• Starter has very long prelubrication cycle. Except for severe cold weather starts, the prelube
cycle should not exceed 45 seconds.
a. Low oil pressure.
b. Make sure oil of the proper viscosity is being
used in respect to outside temperature. (Refer
to engine manufacturer's specifications).
c. Check for suction side air leaks, loose con-
nections, cracked fittings, pump casting, or
hose kinks and blockage.
d. Check the oil pressure switch for the correct
location. Be certain that it has not been
moved into a metered oil flow, as in a bypass
filter or governor assembly.
• Starter has no prelubrication, no delay and no
crank.
If the starter is totally inoperative and no prelubrica-
tion, no delay and crank, this indicates a possible fail-
ure of the prelubrication timer solenoid.
Remove the wire from the pressure switch (ground
wire) and activate the key switch for several seconds.
a. If the starter delays - then cranks, the Prelube
Timer Solenoid is bad. Replace the timer
solenoid assembly.
b. If the starter is still inoperative, check the
truck starter switch circuit. Make sure proper
voltage is available to the Prelube Timer Sole-
noid when the key is activated.
• Starter prelubricates, delays, then does not crank. Indication is either a timer failure, or a starter problem.
a. Place a jumper wire to the starter solenoid “S”
post. If the engine starts to crank, replace the
Prelube Timer Solenoid.
b. If the engine fails to crank when the "S" post
is energized with voltage, check out starter
bendix solenoid and starter pinion drive.
Problem Probable Cause
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