Maintenance Procedures; Coolant Hoses - Monaco DIPLOMAT 2004 Owner's Manual

When performing maintenance, it is also necessary to inspect other
components of the cooling system.
Have an inspection performed of the surge tank cap seal and have the cap
pressure tested, and also replace the thermostat, gasket and seal. The charge air
cooler and radiator also requires an inspection for cracks, broken welds, secure
mounting, and general cleanliness.
It may be necessary to clean the radiator and external coolers more often
under certain conditions. Leaves, twigs, road debris and other contaminants can
block the radiator and cooler fins resulting in reduced cooling system
performance. Blockage can vary depending on road conditions, climate, and
regional conditions. Check the radiator and external coolers weekly for any
blockage and clean as required. To clean the radiator and external coolers,
compressed air is recommended. In the event that road grime, oil, or
inadequate cleaning with compressed air is encountered, a high pressure
washer and degreaser may be used with caution, as excessive pressure can
bend the radiator fins.
Please refer to the Cummins OEM Manual for detailed information
regarding the 24 month/60,000 mile maintenance interval. This service
includes draining the engine coolant, flushing/cleaning the cooling system,
inspecting the water pump standpipe, replacing the thermostat, gasket and seal,
and replacing the coolant and SCA element.
To replace the SCA element (located on the passenger side of the
motorhome), park the motorhome and stop the engine. Close both the inlet and
outlet valves at the element mounting base. Remove the element from the base
and discard properly. Clean the element base and ensure that the old gasket is
removed.
Apply a thin film of clean engine oil to the new element gasket and install it
onto the element head until the gasket contacts the base. Tighten the element an
additional 3/4 turn. Open the inlet and outlet valves. Remove the surge tank
cap and run the engine until the coolant level stabilizes. Add premixed
coolant/water to the system if necessary to bring the coolant to the proper level.
Inspect the fill cap gasket and replace if damaged. Install the fill cap.

Coolant Hoses:

Rotten, swollen and worn hoses, as well as loose connections, are frequent
causes of coolant system problems. Overheating can be caused by a collapsed
hose or a clog caused by rubber shedding from a rotten hose. Replace any hose
found to be cracked, swollen or damaged. Connections should be
inspected periodically and hose clamps tightened.
Every 12 months - Inspect all hoses, clamps, and fittings for leaks due to
cracking, softness, and loose clamps/fittings. Look for signs of fluid leaks,
damaged end fittings, ballooning, chafed, kinked, or crushed hoses, and loose
clamps and fittings. Correct any deficiencies found.
CHASSIS INFORMATION
DIPLOMAT 2004
Maintenance
Procedures
10 • 415