DETROIT DlESEL 53
1,7,2
CAMSHAFT, BALANCE SHAFT AND BEARINGS
The camshaft end balance theft used in the in-line
engines,
are Iocated just below the top of the cylinder
block. The camshaft and balance shaft in the in-line
engines may be positioned on either side the the engine
as required by the engine rotation and accessory
arrangement,
NOTE: The low lift camshaft which provides a
The shafts are supported by bearings (bushing type)
maximum valve cam lobe lift "276" is
that are pressed into bores in the cylinder block The
stamped "V7L" on both ends.
balance shaft is supported by front and rear bearings
only, whereas the camshaft is supparted by end,
Lubrication is supplied under pressure to the camshaft
intermediate and center bearings.
and balance shaft and bearings via oil passages
branching off from the main oil gallery direct to the
camshaft end bearings.
The camshafts in the
engine are supported by two end
three cylinder
In addition, oil is forced through an oil passage in
b e a r i n g s and intermediate bearings
each camshaft which lubricates the camshaft interme-
diate bearing. On the current camshafts: the
intermediate journal oil grooves were eliminated end a
chamfer added to the intermediate journal oil holes:
To facilitate assembly, letters signifying the engine
When replacing a former camshaft with a current
models in which a shaft ma be used are stamped on
camshaft, always use new bearings.
the ends of the shaft. The letters on the timing gear
end or the camshaft must c and with the engine
All of the camshaft and balance shaft bearings
model. For example, the letters RC are stamped
incorporate small slots through which lubricating oil is
camshaft used in an RC model engine For additional
directed to the cam follower rollers.
identification, a camshaft with no designation on the
ends or a "7" stamped on the ends Is a high-weekly
high-lift camshaft. A camshaft stamped with "V" or
Remove Camshaft or Balance Shaft
"V7" is a low velocity high-lift camshaft
Whenever an engine is being completely reconditioned
of the bearings, thrust washers, of the gears need
Fig.1 Removing or Installing Nut on
Fig. 2 : Removing or Installing( Thrust Washer
Camshaft or Balance Shaft
Retaining Belts
SEC. 1,7,2 Page 1
August, 1972
