DETROIT DIESEL 53
GEAR TRAIN AND ENGINE TIMING
The idler gear rotates on a stationary hub
A train of helical gears, completely enclosed between
the engine end plate and the flywheel housing, is
The camshaft and balance shaft gears on In-line
located at the rear of the Series 53 engines.
are pressed on and keyed to their respective shafts and
The gear train on an In-line engine (Fig. 1) consists of
each gear is secured by a retaining nut and lock plate
a crankshaft gear, an idler gear, a camshaft gear, and
a balance shaft gear. The governor drive gear, the
The crankshaft, idler, camshaft and balance shaft
upper blower rotor gear for the
engines are completely
gears on In-line
interchangeable with each other
are driven by the camshaft gear or
balance shaft gear, depending-upon the engine model.
On In-line engines, the camshaft and balance shaft
gears have additional weights attached to the rear face
of each gear.
These weights are
important in maintaining perfect engine balance.
engines, the crankshaft gear is
pressed on and keyed to the end of the crankshaft.
Fig. 1. In-Line Engine Gear Train Timing Marks (Standard Timing Shown)
SEC. 1.7.1 Page 1