Adjusting the Valve Lash
NOTE:
Proper valve lash clearance allows the engine to produce the best
possible performance with the lowest emissions. Valve lash adjustments
should be performed by an authorized Detroit™ maintenance or repair
facility.
Perform a valve lash adjustment as scheduled for the appropriate engine duty cycle.
Monitoring the Belt Tensioner
The engine is equipped with two engine belt tensioners to ensure the belts are
neither too tight nor too loose. Belts that are too tight impose extra loads on the
crankshaft, fan, and alternator bearings shortening both belt and bearing life. A
loose belt will slip and generate excessive heat that may cause damage to the belt
and accessory drive components.
WARNING: PERSONAL INJURY
To avoid injury from rotating belts and fans, do not remove and
discard safety guards.
1. Inspect the belt tensioner for wear or damage.
2. If damage is found it may need to be replaced by an authorized Detroit™
maintenance or repair facility.
Monitoring the Serpentine Belts
Two poly-V-belts (8 and 9) are used on the engine for On-Highway Vehicle
applications. One belt drives the fan hub and the other belt drives the remaining
accessories. To provide proper running tension, the current engine uses an
automatic fan hub belt tensioner (6) and an accessory belt tensioner (2). Automatic
belt tensioners require no adjustment.
DD Platform EuroIV Operators Manual
All information subject to change without notice.
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DDC-SVC-MAN-0175
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