CHRYSLER #SK4318 318-360 INBOARD WITHOUT ELECTRONIC IGNITION
(Does not apply for V-Drives)
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Ref. No.
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Fresh Water Cooling Full Systems
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SK 4318
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Up to 1985 - 318/360 Rear Mount on engine heat exchanger for straight inboards without electronic ignition. (Complete kit with hoses and all parts). IMPORTANT: If hot water heater or cabin heater is to be used, special heater tee #SK 3318 must be used or manifold cracking may occur. See Below. This system will not work on engines that have the dual impeller (dual pocket) raw water pump (see ref. #
SHE D55
). You must be using the single impeller (single pocket) raw water pump (see ref. #
SHE G7B
) and the automotive type circulator pump on the front of your engine.
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SK 3318
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Heater Tee. IMPORTANT: If hot water heater or cabin heater is to be used, special heater tee #SK 3318 must be used or manifold cracking may occur.
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1. Disconnect battery. Drain engine block and manifolds.
2. Remove original thermostat housing and discard. Replace with housing (supplied) placing thermostat under housing with pointed end up.
3. Remove lifting ring from port head. Bolt heat exchanger mounting brackets #SK1318 to rear of cylinder heads. Fasten mounts to cylinder head using bracket with two holes and two spacer pipes and 1-3/4” long bolts.
Starboard head has one bolt hole. Use mounting bracket with one hole and bolt directly to cylinder head. Note: Most engines are 5/16” NC thread; however, it is possible to have a 3/8” NC thread in head.
Place heat exchanger on mounting brackets centering it between manifolds and clamp with #88 clamps.
4. Remove exhaust risers. Remove ¾” O.D. brass tubes in manifolds and discard. Clean both surfaces thoroughly. Bolt back together using the new blank gasket (supplied). Use gasket cement, such as Permatex aviation type.
5. Screw fittings in lower rear of manifold with ¾” hose end pointing forward. Screw ½” x 90 degree x ¾” hose fittings into front covers or exhaust manifolds pointing inboard.
Using the tee with the 45 degree leg and the 1” x 2” hose, clamp to the front of the intake manifold. Connect the ¾” hose ends of the tee to the lower rear of each manifold. Using the tee with air bleed plug and the 1” x 3” hose, clamp the hose to the hose connection on top of circulating pump. Connect the ¾” hose ends to the front of the exhaust manifolds. Note: some automobile conversions may have been used to replace the engine. In this case, the hose sizes on pump and intake manifold may be a different size. If so, contact Seakamp for further instructions.
6. Use the 1-1/2” x 90 degree hose, reducing elbow and the 1-1/4” hose to connect from the thermostat outlet to the 1-1/4” hose connection on the heat exchanger’s upper tank.
Use the two 1-1/2” x 19” flex hoses and the 1-1/2” tube to connect from the water pump to the 1-1/2” hose connection on the heat exchanger.
7. Use 1-1/4” return fitting and 1-1/4” hose to connect seawater pump to the heat exchanger’s seawater inlet.
Screw brass fittings ½” x 90 degree x ¾” hose into exhaust risers at pipe thread closest to the blank gasket - low on the riser for proper cooling. Connect to ¾” hose ends on the heat exchanger.
8. Some hose may be longer than necessary. Cut to proper length to make a neat appearance.
Re-torque all hose clamps after first warm up.
Fill heat exchanger with water or 50/50 antifreeze solution. Start engine and run at fast idle (1000-12000 rpm) with filler cap off – observing water level and add as needed.
It may be necessary to open 1/8” bleed plug on front tee to bleed air.
When thermostat opens and heat exchanger feels warm, top off coolant again and replace fill cap.
Always watch temperature gauges closely on new installations.
IMPORTANT: If hot water heater or cabin heater is to be used, a special heater tee #SK3318 must be used or manifold cracking may occur. Please consult Seakamp for technical information.