TRUCK SERVICE MANUAL
ENGINE
6. Remove cleaner from solvent and steam clean
Parts which are worn beyond replacement limits at this
thoroughly to remove all traces of solvent.
inspection should be replaced with new or rebuilt parts or
7. Dry thoroughly with compressed air.
units.
If, during major inspection, it is determined that
Caution: Failure to remove solvent may cause
crankshaft journals or any other engine parts are worn
engine to overspeed until all solvent is sucked from
beyond worn replacement limits, engine should be
cleaner.
removed and completely rebuilt.
8. If air cleaner is to be stored, dip in lubricating oil to
prevent rusting of screens.
Check Engine Blow-By
Note: If screens cannot be thoroughly cleaned by either
Engine blow-by or escape of combustion gases between
method, or if body is pierced or otherwise damaged,
pistons and liners, is usually caused by worn or stuck
replace with new air cleaner.
piston rings, worn cylinder liners or worn pistons.
Water Pump
Blow-by can be detected by running the engine and
At each "D" check remove and replace water pump with
observing the gas escape from the lubricating oil filler
new or rebuilt prelubricated water pump. Refer to Engine
hole with cap or breather open or removed. There is
Shop Manual for rebuild and lubricating procedure.
always some vapor or gas escape at this point due to
heated oil and piston movement, but distinct puffs
Idler Pulley
indicate blow-by.
At each "D" Check, rebuild and repack idler pulley with
Experience and comparison with other units operating at
correct grease. Refer to Engine Shop Manual for rebuild
the same speed are-needed to make a conclusion as to
and lubricating procedure for idler pulley.
the extent of blow-by. Normally, excessive blow-by is
accompanied by oil consumption.
"E" MAINTENANCE CHECKS
At each "E" Maintenance Check, perform all "A", "B", "C"
SEASONAL CHECKS
and "D" Checks in addition to those following.
There are some maintenance checks which may or may
not fall exactly into suggested maintenance schedule due
In Chassis Inspection
to miles or hours operation but are performed once or
The "E" Maintenance Check is made while engine
twice each year.
remains in the unit but some assemblies are rebuilt and
a major inspection is performed to determine whether
Clean Cooling System (As Required)
engine may be operated for another service period, or
The cooling system must be clean to do its work
whether it should be completely overhauled.
Oil
properly. Scale in the system slows down heat
consumption, no oil pressure at idling, oil dilution and
absorption from water jackets and heat rejection from
other signs of wear such as "blow-by" should be
radiator. Use clean water that will not clog any of the
analyzed as part of the inspection.
hundreds of small passages in radiator or water
Since major inspection requires partial disassembly of
passages in block. Clean radiator cores, heater cores,
the engine, it should be done only in a well-equipped
oil cooler and block passages that have become clogged
shop by mechanics thoroughly familiar with worn
with scale and sediment by chemical cleaning,
replacement limits and disassembly and assembly
neutralizing and flushing. Chemical Cleaning A
procedures. This information is available in all Cummins
Fleetguard Water Filter is the best way to insure an
Shop Manuals which can be purchased from any
efficient cooling system by preventing formation of rust
Cummins Distributor.
and scale. If rust and scale have collected, the system
At this period, perform all previous checks and:
must be chemically cleaned. Use a good cooling system
Inspect Bearings
cleaner such as sodium bisulphate or oxalic acid
Rebuild Cylinder Head
Inspect Cylinder Liners
followed by a neutralizer and flushing.
Replace Cylinder Liner Seals
Pressure Flushing
Inspect Pistons
Flush radiator and block when antifreeze is added or
Inspect Connecting Rods
removed, or before installing a water filter on a used
Replace Piston Rings
engine.
Inspect Crankshaft Journals
When pressure flushing radiator, open upper and lower
Inspect Camshaft
hose connections and screw radiator cap on tight. Use
Inspect Cam Followers
hose connection on both upper and lower connections to
Replace Front And Rear Crankshaft Seals
Replace Vibration Damper
make the operation easier. Attach flushing gun nozzle to
Clean Oil Cooler
lower hose connection and let water run until radiator is
Rebuild Water Pump and Idler Pulley
full.
Rebuild Fan Hub
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