III. Engine Servicing Procedures
U L-Series Diesel 26
Injector Leak Test
The leak test should be conducted
immediately following the nozzle opening
pressure adjustment check.
⇒ Wipe the nozzle with a clean shop
towel.
⇒ Decrease the tester pressure about 20
less than the pop-off pressure
and maintain the position.
⇒ There should be no fuel discharge from
the nozzle for at least 10 seconds.
⇒ Re-clean or replace any nozzle that
doesn’t meet the criteria.
Glow Plug Inspection
The following procedure tests the
resistance value of the glow plug.
The test can be performed on or off the
engine.
Total glow plug resistance value should be
≤ 0.9 ohms.
On engine service:
• Remove the buss bar from the glow plug.
• Attach the DVOM red lead to the to the tip of
the glow plug.
Attach the DVOM black lead to a good ground
source. Verify the ground integrity by testing it
with the DVOM.
Off engine service:
• Disconnect and remove glow plug.
• Place DVOM leads across glow plug (one lead
at each end) to obtain resistance reading.
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