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| Overheating problem HELP! https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=11530 |
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| Author: | Simply_Irresistable [ Sun May 19, 2013 9:26 pm ] |
| Post subject: | Overheating problem HELP! |
Hi guys. My name is John and I am new to the forum, this is my first post. So here is my situation. I have an 89 sundowner with a 5.7 cobra. Up until today, it hasn't seen the water since 2008. So yesterday I changed the oil, hooked up the muffs, and she fired right up and I ran it for about 5 mins. No problems. Now the fun part. Today I put in at the ramp, started right up and idled a couple hundred yards towards the end of no wake. Turned back to pick up the family at the dock and it started dying when not in gear. Trying to limp it back to the dock and noticed the temp guage nearly pegged out and some hazy smoke escaping from the side pockets. Shortly after this (still trying to get back to the dock) it started making a grinding noise and started to knock slightly. This was enough for me so I shut her off and paddled onto the trailer. Upon returning home it was completely cooled off so I decided to run some tests. Hooked up the muffs, started first turn of key, ran perfect. No noise except for what I think is the water pump. While running, I pulled the water pump hose off and it was bone dry in the hoses. I checked the impeller and it looked brand new. No signs of any heat. So I guess my question is, will a new water pump fix my problem? I am an auto mechanic, just a little lost in the out drive world. Thanks for reading my book and I hope to hear back from you guys. |
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| Author: | ric [ Mon May 20, 2013 12:01 am ] |
| Post subject: | Re: Overheating problem HELP! |
Yeah new impeller for sure. |
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| Author: | neutron [ Mon May 20, 2013 6:55 am ] |
| Post subject: | Re: Overheating problem HELP! |
Ric he said the impeller looked new.... I would make sure you have no restrictions any of the intake portions of the raw water pump system. and between the the pump and the engine waterpump. did you check the thermostat? could be sticking |
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| Author: | Capt. Hoss [ Mon May 20, 2013 6:57 am ] |
| Post subject: | Re: Overheating problem HELP! |
I just replaced my thermostat this weekend, I was having the same issue. I haven't been able to test it as of yet, but tonight sounds like a good time ti test it. Sorry to hijack your thread. |
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| Author: | NiagaraChillin [ Mon May 20, 2013 7:29 am ] |
| Post subject: | Re: Overheating problem HELP! |
Simply_Irresistable wrote: I checked the impeller and it looked brand new. No signs of any heat. When you say that, do you mean you actually had the impeller out and in your hand? 2 things that can cause the sudden temp spike and smoke, impeller or stuck T-Stat. Both easy to diagnose and fix. |
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| Author: | Technologic80 [ Mon May 20, 2013 9:46 am ] |
| Post subject: | Re: Overheating problem HELP! |
Can you confirm the impeller is spinning when the engine is running? Long time OMC Cobra/OMC King Cobra/Volvo Penta owner here... there have been rare reports of the water pump in the outdrive stripping gears. Then you'd have no impeller movement, alas no water circ. Just a "process of elimination" item to add to your list, thats all.... |
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| Author: | LouC [ Mon May 20, 2013 11:03 am ] |
| Post subject: | Re: Overheating problem HELP! |
The OMC specified raw water impeller test is to back the boat in the water. Remove the raw water intake hose at the Thermo housing. Hold the hose straight up whole someone starts the engine. You should see a good stre of water 2-4" high. If not you need to check the whole raw water supply system. It could be a blockage from old impeller pieces in the water intake line, bad thermostat or bad seals on the tube in the lower gear housing that transfers water from the lower to the upper gear unit. |
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| Author: | ric [ Mon May 20, 2013 11:32 am ] |
| Post subject: | Re: Overheating problem HELP! |
Looks new doesn't matter. Its been stuck in the same position for 5 years. Its trash. |
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| Author: | Simply_Irresistable [ Mon May 20, 2013 11:56 am ] |
| Post subject: | Re: Overheating problem HELP! |
Yes I had the impeller out in my had. It was replaced for winterization. Still very flexible like a brand new one. I'm going to try a flush today. Is there a possibility of dobbers clogging up the line before the impeller? |
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| Author: | Simply_Irresistable [ Mon May 20, 2013 12:01 pm ] |
| Post subject: | Re: Overheating problem HELP! |
Another question is: did I break anything during this event? It ran perfect on the muffs after cooling down |
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| Author: | ric [ Mon May 20, 2013 12:28 pm ] |
| Post subject: | Re: Overheating problem HELP! |
Well you're an auto mechanic, and it's just a standard chevy car engine. The typical dangers from overheating an engine including warped heads and or blown head gaskets. Also the rubber hoses that connect to the exhaust manifolds can melt. |
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| Author: | NiagaraChillin [ Mon May 20, 2013 12:44 pm ] |
| Post subject: | Re: Overheating problem HELP! |
Simply_Irresistable wrote: Another question is: did I break anything during this event? It ran perfect on the muffs after cooling down Like ric said, normal damage that would come from an overheated engine can occur. I had the same thing happen to me last season, luckily no damage to engine. The smoke was from the negative battery cable coating melting because it drooped low enough to come in contact with exhaust when my impeller failed. New impeller and neg battery cable (tied up out of the way of exhaust), and all was well with no after effects to the engine. |
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| Author: | Simply_Irresistable [ Mon May 20, 2013 1:50 pm ] |
| Post subject: | Re: Overheating problem HELP! |
Impeller shaft is fine. Just checked that. What should I try next that I can do in the driveway? |
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| Author: | NiagaraChillin [ Mon May 20, 2013 2:19 pm ] |
| Post subject: | Re: Overheating problem HELP! |
Simply_Irresistable wrote: Impeller shaft is fine. Just checked that. What should I try next that I can do in the driveway? Can't do it in the driveway, but Lou C has the best advice. Also, he is the resident OMC / Old Four Winns boat expert here IMO. LouC wrote: The OMC specified raw water impeller test is to back the boat in the water. Remove the raw water intake hose at the Thermo housing. Hold the hose straight up whole someone starts the engine. You should see a good stre of water 2-4" high. If not you need to check the whole raw water supply system. It could be a blockage from old impeller pieces in the water intake line, bad thermostat or bad seals on the tube in the lower gear housing that transfers water from the lower to the upper gear unit.
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| Author: | Simply_Irresistable [ Mon May 20, 2013 4:08 pm ] |
| Post subject: | Re: Overheating problem HELP! |
Ok so I found this while flushing. Facing the motor, on the left hand side there is a hose that runs from the thermo housing back under the exhaust and connects to the back of the motor. It had a funnel like cup attached to it, but it was just hanging there. Is this my power steering cooler line? And is this my problem? |
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