| Author |
Message |
    
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 122
Registered: 10-2007
| | Posted on Monday, June 22, 2009 - 03:23 pm: | 
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Guys,
I install a rebuild power head , during the break 24:1 oil premix , If I run the engine for hours variable throttle the engine runs like it should, shutoff fires right back up , however if I let it sit for 15 to 20 minutes it will not crank period , manually turn the engine my hand tight i can feel it.
Once it cools down from 145 degrees to 120 degrees it fires right up
Question is is this normal ?
I am certainly not overheating since 145 degrees for a block that is just shutoff I have new gauges and senders installed on both starboard and port side of the block , At the time of the shutoff the temp is 130/125 , with the engine off it rises to 135/145 thats when it locks up not even the starter can turn it .
Should I be concerned or this is normal ? |
Joe Reeves
Senior Member
Username: joereeves
Post Number: 7475
Registered: 02-2001
| | Posted on Monday, June 22, 2009 - 03:35 pm: |
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A engine that seizes up? No, that's not normal.
You state "shutoff fires right back up .... if I let it sit for 15 to 20 minutes it will not crank period".
This is a complete reversal of how a engine would be affected if it overheated bad. I don't know what your problem is BUT if it were me, I'd be tearing that powerhead down again for a complete inspection. |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 123
Registered: 10-2007
| | Posted on Monday, June 22, 2009 - 04:19 pm: |
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Joe , Please note when it cools down to 120/130 it starts right up ! |
jamie campbell
Advanced Member
Username: outboard_doctor
Post Number: 430
Registered: 02-2009
| | Posted on Monday, June 22, 2009 - 10:30 pm: |
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ho rebuilt the power head? if you bought it i would have a word with hthe rebuilder |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3808
Registered: 04-2006
| | Posted on Monday, June 22, 2009 - 10:57 pm: |
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Getting a bit confused here.
Are You saying the engine is 'locked' or is it cranking but not firing?
A warm engine would normally have a higher compression than a cold. Might a weak starter be the issue? |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 124
Registered: 10-2007
| | Posted on Monday, June 22, 2009 - 11:12 pm: |
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I replace the starter thinking it was the culprit but no luck , The starter cannot turn it , after it cools down it fires right up |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3809
Registered: 04-2006
| | Posted on Tuesday, June 23, 2009 - 01:13 am: |
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Does the starter get enough Amps from battery and through the starter relay? Ground connection?
Have You tried a fresh battery straight on the starter?
Which engine are we talking about? |
jamie campbell
Advanced Member
Username: outboard_doctor
Post Number: 432
Registered: 02-2009
| | Posted on Tuesday, June 23, 2009 - 01:16 am: |
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Andrew you say you cant start it once turned off but when you try to turn it by hand its locked up |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 125
Registered: 10-2007
| | Posted on Tuesday, June 23, 2009 - 10:06 am: |
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Morten its my next test , I indeed extended the battery cable before this engine its approx 14 feet long dual batteries with a switch. I thought about it but remember I did verify by turning the engine by hand its indeed really hard to turn it. If I let it sit for a while low and behold I can turn it easily by hand then hit the key switch it fires right up the new starter and dual batteries spins that motor like a jet .. |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3814
Registered: 04-2006
| | Posted on Tuesday, June 23, 2009 - 10:17 am: |
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At the same time, remove all spark plugs when hot and test. That will eliminate a compression issue. |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 126
Registered: 10-2007
| | Posted on Tuesday, June 23, 2009 - 10:49 am: |
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I did it turns not freely but it turns with the plugs hot ! |
jamie campbell
Advanced Member
Username: outboard_doctor
Post Number: 440
Registered: 02-2009
| | Posted on Tuesday, June 23, 2009 - 08:46 pm: |
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Andrew did you rebuild it or purchased it?? |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3815
Registered: 04-2006
| | Posted on Tuesday, June 23, 2009 - 09:03 pm: |
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Andrew.
I'm sorry, but Your answers are a bit cryptic.
I'll try to make it more simple, simply answer yes or no.
Engine runs, has power and idles without problem. yes/no?
Warm engine will not crank with plugs installed? yea/no?
Voltage at starter IN is above 10,5 volts when cranking both warm and cold? yes/no
Warm engine will crank with plugs removed? Yes/no?
Engine cranks warm and cold with battery cables no longer than 2meters DIRECT on the starter? (relay bypassed) yes/no? |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 128
Registered: 10-2007
| | Posted on Tuesday, June 23, 2009 - 10:07 pm: |
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Sorry Morten
Answers in order
Yes
Yes
I did not test it
Yes
I did not test it (Brand new wire, starter, and solenoid ) |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 129
Registered: 10-2007
| | Posted on Tuesday, June 23, 2009 - 10:09 pm: |
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Jamie ,
I purchase it from Powerhead Exchange in Tampa FL |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3818
Registered: 04-2006
| | Posted on Tuesday, June 23, 2009 - 11:07 pm: |
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I guess there is nothing wrong with Your power head, or it would most definitely not run properly at idle when 'warm'.
Then back to the two You did not test.
Hook a battery with 'short' cables straight to the engine (normal on solenoid and clean ground and test) At the same time do the voltage measurements.
Have You checked the oil in the lower unit? |
jamie campbell
Advanced Member
Username: outboard_doctor
Post Number: 447
Registered: 02-2009
| | Posted on Tuesday, June 23, 2009 - 11:13 pm: |
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Andrew is the engine hard to turn over on the muffs at home once it stops?...If it is remove the gearbox and run the hose directly into the water tube and try that and see if the engine is again hard to turn over this way will eliminate engine or gearbox |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 131
Registered: 10-2007
| | Posted on Tuesday, June 23, 2009 - 11:34 pm: |
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Morten,
I am confuse why check the oil ? What am I looking for ? I did change it a few months ago on the old powerhead but I will check it like u ask , I just curious ? |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3819
Registered: 04-2006
| | Posted on Wednesday, June 24, 2009 - 12:14 am: |
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Just to be sure it is not get gear box seizing up when getting warm. Not likely as it will even affect the idling. Condition of the oil will tell You |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 132
Registered: 10-2007
| | Posted on Wednesday, June 24, 2009 - 11:27 am: |
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Thanks Guys I will check .. |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 136
Registered: 10-2007
| | Posted on Thursday, June 25, 2009 - 10:26 pm: |
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LU oil looks good, no water,metal etc.
I pull the air cover and low and behold a stuck float in #3 cylinder over flowing and flooding #4 also, per the re bulder this is the cause of the lock up (too much fuel to compress hot) carbs were professionally rebuild less than 20 hours go figure.
Lesson learn here I follow what I was told regardless of how in significant it seem at the time
I swap in my spare and the engine runs like a rabbit stay tune . |
Andrew Mackhrandilal
Advanced Member
Username: nymack66
Post Number: 138
Registered: 10-2007
| | Posted on Tuesday, June 30, 2009 - 05:39 pm: |
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Thanks Guys happy to report all is well |
