Service manual

EXHAUST MANIFOLD I HEAT EXCHANGER
EXHAUST MANIFOLD
The exhaust manifold, which was disassembled from the
cylinder head, should be inspected before reassembly.
1. Remove the exhaust elbows from the lower surface
of
the manifold. Clean and inspect for cracks and defects.
Replace as needed.
2. Remove the exhaust nipples, elbows and plugs from
the manifold.
3. Remove water connectors from the ends
of the manifold
and the end plates (71B).
Be sure to note the proper loca-
tion and arrangement
of each for proper alignment.
4. Examine all parts for defects, corrosion and wear and
replace as needed.
5. Flush out the manifolds interior with a liquid cleaner and
rinse thoroughly with fresh water.
6.
Use a pipe cleaner to clear the passage that connects the
coolant recovery tank tubing.
7. Flush out the coolant recovery tank and it's
connecting tube.
ASSEMBLY
EXHAUST MANIFOLD
....".,"'............... TO COOLANT RECOVERY TANK
REPLACE GASKET
CLEAN AND REPAINT
THE MANIFOLD
1. If the manifold was ·removed as an assembly and left
intact, it can be replaced
on the cylinder head in the
reverse order
of removal. Do not reuse the gaskets; install
new ones and torque the bolts or nuts to the proper
specification (1O-12lb-ft).
2.
If the manifold has been disassembled, follow the
steps below.
a. Loosely attach the elbows to the cylinder head and
the manifold using new gaskets.
Do not use any
gasket sealant.
h. Gradually tighten each fitting to make sure
of proper
alignment
of all the parts. This should be done in three
steps. Torque to 10-12 lb-ft.
c. Reassemble the manifold end plates (71B), and the
connectors
on the manifold. Be sure to use new
gaskets and coat the gasket surfaces with a suitable
gasket cement such as High Tack. Torque the nuts
to 8-10 lb-ft.
d. Reinstall the exhaust connections and plugs into the
manifold using Locktite-Anti-Seize on the threads.
Check the manifold pressure cap.
Open the valve by pulling
it and make sure it closes
when released. Make certain the
upper and lower seals are
in good condition. If any doubt,
replace the cap.
HEAT EXCHANGER
The heat exchanger should be inspected and serviced during
an engine overhaul.
1. Disconnect the hoses
and remove the hose fittings,
petcock, drain plugs
and zinc anode. Also, remove the end
fittings and gaskets.
2. Inspect the tube (casing) for wear and dents,
if at all
suspect replace the heat exchanger.
3. Clean out any zinc debris and pressure test the coolant
and raw water passages .
4. When reassembling, install new gaskets and
O-rings.
Apply some lubricant to the new gaskets and to the
petcocks and fittings as
you install them.
5. Install a new zinc anode.
NOTE: All o/the above can be accomplished by sending the
heat exchanger to a
heat exchanger service shop. They will
also service transmission
and engine oil coolers.
6. Repaint the assembled heat exchanger with Westerbeke
heat resistant spray enamel.
HEAT EXCHANGER
718
REPLACE HOSE
AFTER COMPLETED ENGlN£lSSEMBLY
5. Reconnect all hoses, replacing them as needed.
6. Refill the system with coolant as detailed above.
7. Pressure test system
and check for leaks.
Engines & Generators
29