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| 1982 Marine 318 over heating , please... |
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Message |
    
Nick Meletis
Visitor
| | Posted on Sunday, June 11, 2006 - 10:15 pm: | 
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I have first replaced the Pump impeller and it had several teeth missing. Still over heats, removed the thermostat and checked it out in boiling water and it was fine . Replaced , then removed the hose at the bottom of the close system of the round radiator. Found the rubber missing teeth, still over heating. What next , replace the risers? Please help |
jules
Advanced Member
Username: jules
Post Number: 32
Registered: 08-2005
| | Posted on Monday, June 12, 2006 - 09:55 pm: |
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If the engine was not flished with fresh water after use salt deposites may have built up inside the head and cylinder housing, try flushing with a high preasure cleaner. |
mrpos
New member
Username: mrpos
Post Number: 3
Registered: 06-2006
| | Posted on Tuesday, June 13, 2006 - 09:13 am: |
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If the water supply is good and you are overheating, you have 2 possibilities. It is being blocked from leaving at the risers, or you have a cracked exhaust manifold or blown head gasket. A cracked mainfold will usually manifest itself by heating up before the rest of the engine. A blown head gasket may be detected by a compression check or water in a cylinder. Good luck! |
Pete Parks
Visitor
| | Posted on Wednesday, June 14, 2006 - 04:07 pm: |
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I have twin 1976 318 Chrysler engines. I have read alot of conflicting information on the proper operating temperatures.
The engines are raw water cooled. From Seacock to water pump, then out the exhaust.
Temperatures usually run around 180. Have been told they should run alot cooler.
Any information would be appreciated. |
mrpos
Member
Username: mrpos
Post Number: 4
Registered: 06-2006
| | Posted on Wednesday, June 14, 2006 - 04:18 pm: |
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A 160- 165 F Thermostat would be more suitable. |
dwwcanada
New member
Username: dwwcanada
Post Number: 1
Registered: 07-2006
| | Posted on Tuesday, July 04, 2006 - 12:02 pm: |
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I have a 1971 318 chrysler, and have similar issues, If I run at just under 3000 rpm, the starboard engine temp stays put, but as soon as I increase the RPM above 3000, the temp goes up, and you can smell it (overheating) in the engine compartment. I can smell the exhaust manifold, as well as the hose attached to it gets SUPER hot. My intake on the manifold is under the front part of the manifold, so I use a copper pipe, as it is indicated on the instructions for the replacement manifold, possibly copper is cracked or bad. I am replaceing the manifold this weekend, as I checked all (raw water system only) the waterpump, new impellors, and t-stat are working, and water does flow generously out the exhaust. I can only suspect now a manifold or elbow. |
worden
New member
Username: worden
Post Number: 1
Registered: 06-2009
| | Posted on Sunday, June 21, 2009 - 04:48 pm: |
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i, have a chrysler 318 that wants to overheat. It has a closed water system. Have checked pump heat exchanger ,thermostat,oil cooleer,flushed engie with h2o, hAVE YOU ANY IDEAS ??? TKS. HAROLD |
richardday
Senior Member
Username: richardday
Post Number: 765
Registered: 11-2003
| | Posted on Sunday, June 21, 2009 - 09:37 pm: |
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When all else seems to fail check there is no necking down with carbon of the exhaust line where it joins the exhaust manifold. The cooling water is injected downstream from that junction and one sees normal water flow out the exhaust pipe. |
T Bennett
Visitor
| | Posted on Sunday, August 02, 2009 - 02:04 am: |
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I am having two problems at the moment. I bought a 1966 Marinette with a 318 single engine. I have not heard it run but the previous owner said it had a fresh engine instslled about 2 years ago but has been sitting. He stated that after it was installed and was running it seemed to over heat on one side. what could that be. But first after buying the boat I tried to start it and it wouldn't turn over. The starter enguaged but would not turn the engine over. It seemed to grind. After a couple of clicks it wouldn't do anything. I hit the starter with a hammer and it would click again and stop again. I had the batteries at full charge. I removed the plugs and turned the motor over approx three rounds and it seems to be free and found no water in the cylinders. is this a starter problem or could there be something else creating the problem. Thanks |
danny rheaume
Visitor
| | Posted on Monday, August 03, 2009 - 01:28 am: |
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to t bennet,had simular sittuation remove all ground connections,wire brush all bolts and around where they touch ,it works,your ground is the broblem!! |
T Bennett
Visitor
| | Posted on Monday, August 03, 2009 - 10:27 pm: |
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Thanks Danny I will try that. I looked at the ground and it appeared to be clean but under the bolt and connector could have corrosion I guess. Anything seems better than changing the starter because it looks like I will have to disconnect the propeller shaft, motor mounts, and lift the engine to remove the starter. |
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