When the motorhome has been sitting for extended periods, 30 days or
more, verify all the fluid levels are correct. Follow the normal starting proce-
dures. If the oil pressure gauge does not register within 15 seconds, shut off
the engine immediately to avoid damage. Consult the Cummins Operations
and Maintenance Manual for guidelines on troubleshooting low oil pressure,
or contact a qualified service technician. Allow the engine to idle for 3 to 5
minutes before operating under a load.
A fully formulated antifreeze or coolant containing a precharge of
Supplemental Coolant Additives (SCA) is recommended. The use of either
will significantly simplify coolant system maintenance. The difference
between a fully formatted antifreeze and a fully formatted coolant is the per-
centage of water. Both contain balance amounts of antifreeze, SCA, buffering
compounds and a percentage of good clean quality water. The antifreeze of
coolant must meet ethylene glycol or propylene glycol recommendations. A
good clean quality water in a 50/50 ratio (40 to 60 percent working range)
mixed with fully formatted antifreeze will provide protection from -34º F to
228º F. The 50/50 mix ratio must be premixed prior to being put in the sys-
tem. Placing antifreeze and water in the cooling system is not recommended.
Consult the O&M manual for more details.
NOTE: An over concentration of antifreeze, or the use of high
silicate antifreeze, can cause damage to the coolant system and
engine. Antifreeze is essential in every climate.
The coolant fluid freeze point should be checked with every oil change
interval at 15,000 miles, 500 hours or 6 months, whichever comes first. Also
change the coolant filter at the same interval unless SCA concentration is
over three units. The coolant should be drained and flushed at 6000 hours or
2 years of service, whichever comes first.
Engine Coolant Reservoir:
A “see-through” plastic reservoir, similar to the familiar windshield wash-
er jar, is connected to the radiator by a hose. As the motorhome is driven,
coolant is heated and expands. A portion of fluid displaced by this expansion
flows from the radiator into the reservoir tank. When the engine is stopped,
and coolant cools and contracts, displaced coolant is drawn back in the radia-
tor by a vacuum. Thus, the radiator is kept filled with coolant to the desired
level at all times, resulting in increased cooling efficiency the coolant level
should be at or above the appropriate mark on the reservoir tank when the
system is cold.
Chassis Information
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WINDSOR
10•283
ENGINE
SHUTDOWN -
Extended
COOLANT
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