DETROIT DIESEL 53
Dirt or chips drawn through the blower will make
2. Remove the four blower-to-block bolts and special
deep scratches in the rotors and housing. Burrs around
washers and lift the blower away from the engine.
rotors or between the rotors and the blower housing
Leaky oil seals are usually indicated by the presence of
oil on the blower rotors or inside surfaces of the
blower housing Run the engine at low speed and
direct a light into the rotor compartment and toward
the end plates and the oil seals. A thin film of oil
radiating away from a seal indicates an oil leak.
A worn blower drive resulting in a loose, rattling
sound within the blower may be detected by running
the engine at approximately 500 rpm.
Loose rotor shafts or worn rotor shaft bearing surfaces
will result in contact between the rotor lobes, the rotors
and the end plates, or the rotors and the housing.
Excessive backlash between the blower rotor gears
usually results in the rotor lobes rubbing throughout
their entire length.
Before removing the blower from the engine, remove
the air shut-down housing as outlined in Section 3.3.
3-53 ENGINE BLOWER
1. Remove the six bolts. special washers and
reinforcement plates which secure the blower to the
engine end plate and the flywheel housing. Note the
location of the two shorter bolts. Then remove the front
end plate. cover and gasket from the blower.
Fig. 5 - Removing Blower Rotor Gears