Onan RDJC User Manual

CENTRIFUGAL
PUMP
RAW COOLING WATER
ABOZi
FROM SOURCE
++ --f RAW WATER
-- WATER IN CLOSED SYSTEM
FIGURE 7a. HEAT EXCHANGER COOLING SYSTEM
Maintenance of the closed water system is the same
as a radiator cooled system. Clean and flush it once a
year and use an anti-freeze if there is danger of freez-
ing. Usea rust inhibitor
in theexpansion tank (closed
water system).
Clean and flush the cooling system if conditions war-
. rant. To clean the closed water system, drain and
refill with radiator cleaner. When chemical cleaning is
completed, according to the cleaner manufacturer’s
instructions, flush the cooling system to wash out
deposits loosened by the chemical cleaning.
In the open water system, check periodically for air
leaks, wear or damage, or restricted lines.
The open water portion of the heat exchanger is pro-
tected from corrosion by a zinc pencil mounted on a
pipe plug
in one end of the heat exchanger. Inspect
the pencil at least every two months and replace if
deteriorated to less than one half original size
(Figure 7b.).
FRESH WATER
ZINC PENCIL RAW WATER IN IN
I
A801
FIGURE 7b. HEAT EXCHANGER AND ZINC PENCIL
Flush the engine water jacket. The hose from engine
water jacket to heat exchanger should be removed
from the water outlet. Flush both closed water portion
and raw water poriton of the heat exchanger. Remove
the lockshield valve and solenoid valve to flush the
raw water portion.
Also flush the water cooled
exhaust manifold. When flushing is completed, check
the system thoroughly for any leaks uncovered by the
cleaning operations.
Repair .and test raw water system for air leaks and
insufficient water flow.
Heat exchanger repair, if
it should become clogged,
consists of removing the ends and cleaning out the
tubes:
20
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Onan RDJC Specifications

General

Brand	Onan
Model	RDJC
Category	Engine
Language	English