| Author |
Message |
    
Mark Modzelewski
New member
Username: mojoe
Post Number: 1
Registered: 10-2009
| | Posted on Monday, October 05, 2009 - 10:38 am: | 
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I just bought a used boat with a 1990 25 hp Johnson motor. I had a mechanic tune it up and he had it running at his garage and ran fine. I put thboat in the water and after about 15 minutes the alarm goes off and then when I try to go a little faster the motor just sputters and jumps I have to drive it at a very slow speed. The mecahnic looked at it and it started to happen to him at his garage and he checked it out and said nothing was hot. Also the water coming out of the pee hole is working fine. Does anyone have any ideas. |
David Townsend
Advanced Member
Username: daviet
Post Number: 124
Registered: 08-2009
| | Posted on Monday, October 05, 2009 - 03:13 pm: |
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Is the alarm going off the hot alarm? Does it loose spark on one cylinder when this happens? |
Mark Modzelewski
New member
Username: mojoe
Post Number: 2
Registered: 10-2009
| | Posted on Monday, October 05, 2009 - 03:27 pm: |
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Yes the alarm is the hot alarm I just spoke with the mechannic and he has been testing it he thinks its a coil wire He had it in the water for about 1 hour and the alarm went off twice on him and then started to sputter or sounds like it is missing a spark. I sure hope thats all it is. |
Mark Modzelewski
New member
Username: mojoe
Post Number: 3
Registered: 10-2009
| | Posted on Tuesday, October 06, 2009 - 01:17 pm: |
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The mechanic ended up taking the fly wheel off and found that the magents were all rusted so he took them out and brushed off the rust and put the magents back in He then took the boat on the water for an hour and the motor ran fine no alarm and no sputtering does this sound correct to anyone. I mean why would the rusty magnets cause the hot alarm to go off |
David Townsend
Advanced Member
Username: daviet
Post Number: 135
Registered: 08-2009
| | Posted on Tuesday, October 06, 2009 - 01:28 pm: |
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Not sure about taking the magnets out, brushing them off and putting them back in. The only time I have seen magnets loose on the flywheel is when they broke loose, they are bonded to the flywheel as far as I know.
I have seen rust on the magnets cause ign problems, but never an overheat problem.
Your engine has a tell-tale doesn't it, what does it look like? When the alarm goes off do you see any stean out of the exhaust? |
Mark Modzelewski
Member
Username: mojoe
Post Number: 4
Registered: 10-2009
| | Posted on Tuesday, October 06, 2009 - 01:37 pm: |
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Yes when the alarm goes off there appears to be more smoke and that is when the motor sputters if I try to go faster The motor will run at a very slow speed He also said the after he cleaned the magents the spark and everything started to work better
Yesterday I mentioned a coil wire can that cause the alarm to go off |
David Townsend
Advanced Member
Username: daviet
Post Number: 136
Registered: 08-2009
| | Posted on Tuesday, October 06, 2009 - 02:10 pm: |
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What about your tell-tale, does it pump a good strong stream all the time or does it slow down when the alarm goes off? |
Mark Modzelewski
Member
Username: mojoe
Post Number: 5
Registered: 10-2009
| | Posted on Tuesday, October 06, 2009 - 02:32 pm: |
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From what I rememeber the water was coming out all the time This is my first boat so far costing me more then I expected LOL What els do you think may make the alarm go on |
David Townsend
Advanced Member
Username: daviet
Post Number: 138
Registered: 08-2009
| | Posted on Tuesday, October 06, 2009 - 02:45 pm: |
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If you just bought this motor and are not sure of its history, I would change the water pump. The alarm can be set off a couple of different ways, by actually overheating or a defective sensor or an a short in the sensor wire.
Haven't you ever heard the defination of a boat?
A hole surrounded by water in which you pour money into. |
Mark Modzelewski
Member
Username: mojoe
Post Number: 6
Registered: 10-2009
| | Posted on Friday, October 23, 2009 - 08:34 am: |
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The water pump was replaced and the motor alarm still comes on Do you know where the sensor is on the motor? I guess I am going to have to replace it not sure what else to do |
tom berg
Member
Username: gittyup
Post Number: 19
Registered: 08-2007
| | Posted on Friday, October 23, 2009 - 09:20 am: |
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I have a 60 horse that does the same thing every once in awhile. I had water pump replaced,mech.took it out on lake, no problems.. now I'm just waiting for it to get worse so we can find out whats causing it.. it can drive you crazy sometimes... |
jamie campbell
Advanced Member
Username: outboard_doctor
Post Number: 686
Registered: 02-2009
| | Posted on Sunday, October 25, 2009 - 05:15 am: |
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It sounds like your engine is going into slow because it is overheating. (speed limiting overheat system)
You need to check water pump, thermo, bypass valve. Maybe after the basics you may need to check head gasket |
tom berg
Member
Username: gittyup
Post Number: 20
Registered: 08-2007
| | Posted on Monday, October 26, 2009 - 09:24 am: |
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I've replaced pump and thermo, wheres the bypass valve? thanks for your help,tom |
Mark Modzelewski
Member
Username: mojoe
Post Number: 7
Registered: 10-2009
| | Posted on Monday, October 26, 2009 - 09:33 am: |
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The mechanic replaced the water pump and the alarm still went on. Then he replace a Temp sensor or thermo senser and that seemed to work I took the boat out yesterday and the motor ran fine. When the alarm was going off the motor was never hot |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 4313
Registered: 04-2006
| | Posted on Monday, October 26, 2009 - 09:41 am: |
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Tom:
You get buried in the middle of this thread.
Which 60?
2 or 3 Cyl? |
tom berg
Member
Username: gittyup
Post Number: 21
Registered: 08-2007
| | Posted on Monday, October 26, 2009 - 10:20 am: |
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3 Cyl. |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 4314
Registered: 04-2006
| | Posted on Monday, October 26, 2009 - 09:04 pm: |
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Tom:
A few things to check as you did not state year and model.
1: Thermostat. Do you have the 'old' vernatherm type in a white housing with 3 'wings' or the new black type with only a cone at the end?
If the old type, replace seat and thermostat assy to the 'new' type.
2: The 'pee outlet' nipple on engine.
Is it locate at the exhaust cover on port side on engine, or at the top of the block?
If the 'old' version on the exhaust cover, modify to new on top of the block. |
