| T O P I C R E V I E W |
| Don |
Posted - 05/22/2009 : 8:33:22 PM
Hi All,
I really appreciate all the advice that flows from this forum. I have a 1982 mariner with twin 220 crusader engines. The starboard engine temp gauge goes fairly quickly up to 240 and then rapidly, within 15 seconds, down to 130. It then slowly goes back to 240 and the suddenly back to 130. This happens at idle or low rpms or high rpms. I have replaced the sender and the thermastat but it continues with the same pattern. I would think there is flow constriction but I am confused by the rapid temperature swings. We checked the engine temps with a hand held sensor and the highest recorded temp was 190 when the gauge read 240. I am confused. What should I do next.? Thanks, Don |
| 10 L A T E S T R E P L I E S (Newest First) |
| Rockmeister |
Posted - 06/08/2009 : 11:55:17 AM
Definitely agree with Jimbo, the failure is likely to get worse and fry your engine. (Big risk!)
Also, the engine oil just starts to break down at about 240 or so, building up coke and varnish inside your engine, definitely NOT good for it long term.
Just last week ran into a brand new thermostat that would run up to 240 then drop to 160 or so and cycle back up to 240 again.
(Was a brand new 160 thermostat.)
Put the old one (that worked) back in, and everything was fine.
Would bet on a bad hose at this point with the info you provided.
You can try running it without the thermostat, that will tell you whether it is the thermostat or not, if the problem goes away, the thermostat is at fault.
(At idle, the temp should stay low without a thermostat.)
If the problem remains, or gets worse, the problem is caused by something else.
Watch and/or feel the hoses as the temp cycles, you MAY be able to see the hose doing it.
(Of course keeping all the fingers you want to keep, out of all rotating parts.)
It is not likely to be a pump, they usually work or they don't.
(Still possible, just low probability.)
Earlier you had asked how the outside engine temp could be lower than the internal temp, the heat is coming from the inside to the outside, so this is common that the external temp would be lower.
Hope this helps! 
79 28' Mariner twin inboard V-drive.
SW Lake Erie: Maumee Bay & The Islands |
| Jimbo Song |
Posted - 06/05/2009 : 9:56:38 PM
Temp going to 240? No way you can live with it. Sooner or later it's going to hang there and fry your engine. I think I'd check out Rockmeister's post above as a possibility and then call a good mechanic.
quote:
Originally posted by Don
Thanks for the suggestions. I replaced the thermostat with another but the problem remains. I checked the oil and it looks fine. There must be some sort of partial block. The temperature slowly goes to 240, stay there for about 4 seconds then rapidly drops to 140. The cycle is then repeated...time and time again. Can I just live with this situatuion? Any other thoughts? Thanks, Don
1987 Carver Voyager 28
Jimbo Song |
| Don |
Posted - 06/05/2009 : 9:44:42 PM
Thanks for the suggestions. I replaced the thermostat with another but the problem remains. I checked the oil and it looks fine. There must be some sort of partial block. The temperature slowly goes to 240, stay there for about 4 seconds then rapidly drops to 140. The cycle is then repeated...time and time again. Can I just live with this situatuion? Any other thoughts? Thanks, Don |
| carvermitch |
Posted - 05/30/2009 : 11:56:38 AM
Check your oil to see if it has got any water in it. If the oil has gone milky then it could be a blown head gasket.
That is what the symptoms appear to be also.
regards
Paul
http://www.carvermariner.com |
| Jimbo Song |
Posted - 05/29/2009 : 4:41:37 PM
That's a new one for me. Never saw that before. But, lesson learned and I've filed it in my long term memory cells for future reference. :)
Congrats on finding it!
quote:
Originally posted by rockmeister
Agree about replacing the thermostat again, have had bad ones right out of the box.
Ran into this problem on a machine once.
It was caused by a heater hose that had a leak on the inner layer, water would get between the inner and outer layer and collapse the inner layer blocking the flow, pressure would build up and force it open, then it would plug again, repeating the cycle.
Hope this helps!
Let us know.
79 28' Mariner twin inboard V-drive.
SW Lake Erie: Maumee Bay & The Islands
1987 Carver Voyager 28
Jimbo Song |
| Rockmeister |
Posted - 05/27/2009 : 11:26:33 AM
Agree about replacing the thermostat again, have had bad ones right out of the box.
Ran into this problem on a machine once.
It was caused by a heater hose that had a leak on the inner layer, water would get between the inner and outer layer and collapse the inner layer blocking the flow, pressure would build up and force it open, then it would plug again, repeating the cycle.
Hope this helps!
Let us know.
79 28' Mariner twin inboard V-drive.
SW Lake Erie: Maumee Bay & The Islands |
| Jimbo Song |
Posted - 05/23/2009 : 2:43:50 PM
Sounds a lot like a sticky thermostat. I know you said you replaced it but if it were me, I'd replace it again. I have, in the past, put in a brand new thermostat that was bad so you never know. New doesn not necessarily mean good.
you could, if you wanted to check it an didn't mind the wrenching, exchange the thermostats between the two engines. If the problem moves to the other engine with the thermostat you have your solution. If the problem stays home in the same engine, you'll need to look further. :)
quote:
Originally posted by Don
This happens at idle, low rpm, and high rpm. It seems to make no difference. My port engine warm to 160 and stays there. Thanks Don
1987 Carver Voyager 28
Jimbo Song |
| Don |
Posted - 05/23/2009 : 06:47:57 AM
This happens at idle, low rpm, and high rpm. It seems to make no difference. My port engine warm to 160 and stays there. Thanks Don |
| Justus3 |
Posted - 05/22/2009 : 10:58:39 PM
I have the same engines and once they are warm they run steadily at 175 - no fluctuations that I can see.
Ron |
| Jimbo Song |
Posted - 05/22/2009 : 8:37:37 PM
Is this happening at all speeds and engine load?
quote:
Originally posted by Don
Hi All,
I really appreciate all the advice that flows from this forum. I have a 1982 mariner with twin 220 crusader engines. The starboard engine temp gauge goes fairly quickly up to 240 and then rapidly, within 15 seconds, down to 130. It then slowly goes back to 240 and the suddenly back to 130. This happens at idle or low rpms or high rpms. I have replaced the sender and the thermastat but it continues with the same pattern. I would think there is flow constriction but I am confused by the rapid temperature swings. We checked the engine temps with a hand held sensor and the highest recorded temp was 190 when the gauge read 240. I am confused. What should I do next.? Thanks, Don
1987 Carver Voyager 28
Jimbo Song |
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