Detroit Diesel EPA07, Workshop Manual

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EPA07/10 DD PLATFORM WORKSHOP MANUAL - ENGINE
The gear train on the DD Platform engines is located at the rear of the engine and has three levels.
Level A consists of the outermost gears (closest to the
fl ywheel), Level B consists of the middle
gears, and Level C consists of the innermost gears (closest to the block). The gears in the gear
train are both directly and indirectly driven by the crankshaft gear.
□ Level A: The outermost gears include the crankshaft gear which drives the outer idler gear
number one and the oil pump gear. Idler gear number four is on the crankshaft gear and
the axial power turbine drives the idler gear number four when the Axial Power Turbine
(APT) is creating power. The APT can add additional torque to the crankshaft through
idler gear number four up to 260 N·m (192 lb·ft). These gears are all helical cut.
NOTE:
On the DD13, there is no Axial Power Turbine (APT) and no Idler gear number four. The
position of the idler gear number four is covered by a plate, and sealed with an O-ring.
□ Level B: The middle gears include idler gear number one, which drives the air compressor
gear and the idler gear number two. Idler gear number two drives the high pressure fuel
pump and idler gear number three. These gears are all straight cut.
□ Level C: The innermost gears include inner idler gear number three which drives idler gear
number fi ve. Idler gear number fi ve drives both intake and exhaust camshafts. These
gears are all straight cut.
Gear train noise is an indication of excessive gear lash, chipped or burred gear teeth. A rattling
noise usually indicates excessive gear lash. A whining noise indicates too little gear lash.
Therefore, when noise develops in a gear train, the gear train needs to be inspected.
All information subject to change without notice.
DDC-SVC-MAN-0081 2010
Copyright © 2010 DETROIT DIESEL CORPORATION
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