Operators Manual

Table Of Contents
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
DD Platform engines utilize a specially designed belt material which is exclusive to
the Original Equipment Manufacturer (OEM) component. Replacement with an
aftermarket part may lead to shortened maintenance intervals and excessive noise.
Drive belts wear differently based on environmental conditions and vehicle duty
cycle. If the vehicle is operated in extremely hot or cold climates, or is exposed to
significant dust/debris/road salt, lifetime of the belts may be significantly reduced.
Fuel / Water Separator
Incorporated into the fuel filter module is a fuel/water separator/coalescer. The
separator removes emulsified water as well as droplets and is located in the lower
compartment of the fuel filter module. A water-in-fuel (WIF) sensor indicates when
trapped water needs to be drained.
NOTICE: Do not over-tighten the water drain valve. Failure to properly
tighten the water drain valve may cause damage to the water drain valve
and housing.
Preventive Maintenance Intervals
116 All information subject to change without notice.
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