TM 5-3810-300-24&P-3
Lubrication System 4
Fig. 2. Blower Lubrication
housing from the bearings of the camshaft, balance shaft
Lubrication System Maintenance
and idler gear.
Use the proper viscosity grade and type of heavy duty oil
The blower drive gear bearing is lubricated through an
as outlined in the Lubricating Oil Specifications in Section
external pipe from the rear horizontal oil passage of the
13.3. Change the oil and replace the oil filter elements at
cylinder block.
the periods recommended by the oil supplier (based on
his analysis of the drained engine oil) to ensure trouble-
A longitudinal oil gallery on the camshaft side of the
free lubrication and longer engine life.
cylinder head is supplied with oil from one of the vertical
bores located at each end of the cylinder block. Oil from
The oil level should never be allowed to drop below the
this gallery enters the drilled rocker arm shafts through
low mark on the dipstick. Overfilling the crankcase may
the rocker shaft brackets at the lower ends of the drilled
contribute to abnormal oil consumption, high oil
bolts and lubricates the rocker arm bearings and push
temperature, and also result in oil leaking past the
rod clevis bearings.
crankshaft rear oil seal.
Excess oil from the rocker arms lubricates the ends of
To obtain the true oil level, the engine should be stopped
the valve push rods, injector push rods and the cam
and sufficient time (approximately twenty minutes)
followers, and then drains to cam pockets in the top of
allowed for the oil to drain back from the various parts of
cylinder block from which the cams are lubricated.
the engine. If more oil is required, add only enough to
When these pockets are filled, the oil overflows through
bring the level to the full mark on the dipstick.
two holes, one at each end of the blower housing, as
shown in Figs. 1 and 2, and thus provides lubrication for
the blower drive gears at the rear end and for the
Cleaning Lubrication System
governor mechanism at the front end. A dam in the
blower rear end plate cover maintains an oil level in
Thorough flushing of the lubrication system is required at
which the teeth of the lower blower rotor timing gear run.
times. Should the engine lubrication system become
A slinger at the forward end of lower rotor throws oil from
contaminated by ethylene glycol antifreeze solution or
the dam onto the governor weight assembly. Surplus oil
other soluble material, refer to Section 5 for the
overflows the dam in the end plate covers and passes
recommended cleaning procedure.
through drilled holes in the cylinder block to the oil pan.
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