Workshop Manual

EPA07/10 DD PLATFORM WORKSHOP MANUAL - ENGINE

The gear train on the DD Platform engines is located at the rear of t he engine and has three levels.

Level A consists of the outermost gears (closest to the ﬂywheel), Level B consists o

f 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 drive

s 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 t orque to the cr

ankshaft 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 Powe r Turbine (APT ) an d no Idl

er gear number fou r. T he

position of the idler ge ar number four is cove red 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: T he innermost gears include inner idler gear number three which drives idler gear

number ﬁve. Idler gear number ﬁve drives both int

ake 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 la

sh. 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.