Pressure Testing Cooling System - Northern Lights OM-C3 Operator's Manual

Pressure Testing Cooling System

CAUTION: Explosive release of fluids from
pressurized cooling system can cause
serious burns.
Shut off engine. Only remove filler cap when
cool enough to touch with bare hands. Slowly
loosen cap to first stop to relieve pressure
before removing completely.
Test Coolant Filler Cap
1. Remove coolant filler cap and attach to an appropriate
tester as shown.
2. Pressurize cap to specifications. Gauge should hold
pressure for 10 seconds within the normal range if cap
is acceptable.
If gauge does not hold pressure, replace pressure cap.
Specification
Radiator
Cap—Pressure..................................................110kPa (1.1 bar) (16 psi)
3. Remove the cap from gauge, turn it 180°, and retest
cap. This will verify that the first measurement was
accurate.
Test Cooling System
NOTE: Engine should be warmed up to test
overall cooling system.
Lubrication & Maintenance/500 Hour/12 Month
1. Allow engine to cool, then carefully remove coolant
2. Fill tank with coolant to the normal operating level.
IMPORTANT: DO NOT apply excessive pressure
3. Connect gauge and adapter to filler neck. Pressurize
Cooling System—Pres-
sure................................................................................. 110kPa (16 psi)
4. With pressure applied, check all cooling system hose
OM-C3 | 12/6 | 50
filler cap.
to cooling system, doing so may damage
coolant tank and hoses.
cooling system to specifications.
Specification
connections, coolant tank, and overall engine for leaks.
If leakage is detected, correct as necessary and
pressure test system again.
If no leakage is detected, but the gauge indicated a
drop in pressure, coolant may be leaking internally
within the system or at the block-to-head gasket. Have
your servicing dealer or distributor correct this problem
immediately.
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