Detroit Diesel DD15 EuroIV Operator's Manual page 59

WARNING: HOT COOLANT
To avoid scalding from the expulsion of hot coolant, never
remove the cooling system pressure cap while the engine is at
operating temperature. Wear adequate protective clothing (face
shield, rubber gloves, apron, and boots). Remove the cap slowly
to relieve pressure.
1. Inspect the radiator, condenser, coolant pump, engine oil cooler, freeze plugs,
and heat exchanger for damage and leaks.
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.
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. 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. 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.
Drive Belt
Belts should be neither too tight nor too loose. Belts that are too tight 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.
WARNING: 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. A concern occurs when the belt ribs exhibit
severe multiple cracking or 'chunking'. At this point, the belt should be replaced.
All information subject to change without notice.
DDC-SVC-MAN-0175 Copyright © 2014 DETROIT DIESEL CORPORATION
DD Platform EuroIV Operators Manual
59