Testing Diesel Engine Coolant - Northern Lights OM-C3 Operator's Manual

Testing Diesel Engine Coolant

Maintaining adequate concentrations of glycol and
inhibiting additives in the coolant is critical to protect the
engine and cooling system against freezing, corrosion,
and cylinder liner erosion and pitting.
Test the coolant solution at intervals of 12 months or less
and whenever excessive coolant is lost through leaks or
overheating.
Coolant Test Strips
Coolant test strips are available from your John Deere
dealer. These test strips provide a simple, effective
method to check the freeze point and additive levels of
your engine coolant.
Remove, Inspect and Clean Engine Heat
Exchanger Core
IMPORTANT: Initially remove and inspect the engine
heat exchanger core at 250 hour or three
month service interval on a new engine.
Then, remove and clean at every 500 hour
or 12 month interval thereafter.
1. Close sea cocks and drain the sea water system.
2. Open drain cock on cylinder block and drain
approximately two gallons of engine coolant into a clean
container. Close drain cock.
3. Loosen hose clamp (A) and remove hose from rear
end cap (B).
4. Remove two end cap mounting cap screws and remove
end cap (C) with heat exchanger core (D) from rear of
engine.
A—Clamp
B—End Cap
Lubrication & Maintenance/500 Hour/12 Month
C—End Cap
D—Heat Exchanger Core
OM-C3 | 12/6 | 45
Compare the results to the supplemental coolant additive
(SCA) chart to determine the amount of inhibiting additives
in your coolant and whether more John Deere COOLANT
CONDITIONER should be added.
COOLSCAN Or COOLSCAN PLUS
For a more thorough evaluation of your coolant, perform
a COOLSCAN or COOLSCAN PLUS analysis. See your
John Deere dealer for information about COOLSCAN or
COOLSCAN PLUS.
Heat Exchanger End Cap
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