Item 3 - Valve Lash Checking And Adjustment; Item 4 - Drive Belts - Detroit Diesel MBE 900 Operator's Manual

2. Check all cooling system pipes
and hoses for damage and leaks;
ensure they are positioned to
avoid chafing, and are securely
fastened.
3. Check the outside of the radiator
and condenser for blockage.
Check fins for damage; straighten
them if necessary.
Item 3 – Valve Lash Checking
and Adjustment
Valve lash checking and adjustment
should be performed per the
maintenance intervals prescribed
under the proper service category
for the engine, Refer to section
Scheduled Intervals in this guide.
All three service categories (Severe,
Short Haul, and Long Haul) require
a "first time" valve lash adjustment
at a shorter interval. After the
initial adjustment, all others are
based on the same mileage intervals.
Refer to section Maintenance Tables in
this guide. 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 Diesel maintenance or repair
facility.
Item 4 – Drive Belts
Belts should be neither too tight nor
too loose. Belts that are too tight
All information subject to change without notice. (Rev. 04/08)
DDC-SVC-MAN-0040 0704 Copyright © 2008 DETROIT DIESEL CORPORATION
MBE 900 ENGINE 2007 OPERATOR'S GUIDE
impose extra loads on the crankshaft,
fan and/or alternator bearings,
shortening both belt and bearing life.
Excessively overtightened belts can
result in crankshaft breakage. A loose
belt will slip and generate excessive
heat that may cause damage to the belt
and accessory drive components.
PERSONAL INJURY
To avoid injury from rotating belts
and fans, do not remove and
discard safety guards.
Belt Replacement – Drive belts (V
and poly-V) should be replaced every
2,000 hours or 100,000 miles (160,000
km).
After an extended time in service,
minor rib cracks may appear, usually
one or two cracks per inch is
considered normal. See Figure 29
A concern occurs when the belt ribs
exhibit severe multiple cracking or
"chunking". At this point, the belt
should be replaced.
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