III. Engine Servicing Procedures
U
L-Series Diesel 27
Hot Plug Replacement
Note: Illustration is generic and does not
precisely represent the L-Series hot plugs.
Hot plugs for the L-series are similar to
other Isuzu diesel engines.
If the plug needs to be replaced, knock out
the old plug from behind, though the
injector nozzle hole.
Always remember that the plug groove in
the cylinder head needs to be clean and free
of any burrs that would prevent proper
seating. Align the hot plug knock ball (1)
with the cylinder head groove (2) and tap it
temporarily into position with a plastic
hammer.
NEW PLUG:
Place a 1” thick metal plate over the top of
the hot plug and press fit the plug using 4
to 5 tons of force on the metal plate.
OLD PLUG:
When re-using plugs, be sure to place the
plug in the same hole that it came out of
originally. Tap the plug head into place and
ensure that the plug is firmly seated. Grind
off any surface protrusions so that it is
completely flush with the surface of the
head.
NOTE: Most current/newer model
surfacing machines do not require hot
plug removal before head refinishing.
Consult your particular equipment
manual.
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