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Lawnmower gets hot and quits Sherman 07-15-2005
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Posted by Rick on July 15, 2005, 1:04 pm



>
> >
> message
> > >
> > > I took a small engine repair course years ago. To fix this, you
> have to
> > > take
> > > off the motor cover, the cylinder head, and then remove both
> valves. Grind
> > > a
> > > little off the bottom, ch eck the clearance, and put it back
> together.
> > > Requires some specialized tools, and some replacment gaskets.
> >
> > What makes for less clearance after 4 years of running? I'd have
> thought
> > the opposite would happen. Or is it worn on the stem and not
> contacting
> > properly so relieving the valve seat brings it back?
>
>
> No, the valve seat sinks into the block. There's supposed to be a
> little clearance between the lifter and the tip of the stem, so you
> grind the end off.

> That's for the more common valves in block type., not on an OHV..


Or the seat and the valve face wear. In that case, seat and valve
regrind or replacement....




Electric Radiant Heat 468x60
Posted by Lawrence Wasserman on July 15, 2005, 1:52 pm


> My 4 year old lawnmower gets hot and dies. I can mow for 15 minutes
>and it coughs and sputters and then shuts down completely and will not
>restart - for 15 minutes. Then it will start and runs another 10
>minutes.
>
> Seems to be a heat related issue. I cleaned out the debris and
>replaced the spark plug. No change.
>
> What could be wrong and how do I determine it?
>
> Sherman
>

Have you tried cleaning or replacing the air filter?


--

Larry Wasserman Baltimore, Maryland
lwasserm@charm.net



Posted by Sherman on July 15, 2005, 2:09 pm


wrote:

> My 4 year old lawnmower gets hot and dies. I can mow for 15 minutes
>and it coughs and sputters and then shuts down completely and will not
>restart - for 15 minutes. Then it will start and runs another 10
>minutes.
>
> Seems to be a heat related issue. I cleaned out the debris and
>replaced the spark plug. No change.
>
> What could be wrong and how do I determine it?
>
> Sherman

This is a push mower Craftsman about a 4 hp.

I removed the gas filter bowl and it was clean. No change after
cleaning and reinstalling. Started right up and ran for 10 minutes..

After it dies hot, it will not start or even try to start. The pull
compression feels about the same hot or cold. But I can't measure the
vacuum (or can I?)

Has to cool down and at some point it cools enough to start on first
pull and runs good for 10 minutes.

I will check for spark next time it is dead.

Sherman





Posted by Edwin Pawlowski on July 15, 2005, 2:16 pm




>
> I removed the gas filter bowl and it was clean. No change after
> cleaning and reinstalling. Started right up and ran for 10 minutes..
>
> After it dies hot, it will not start or even try to start. The pull
> compression feels about the same hot or cold. But I can't measure the
> vacuum (or can I?)
>
> Has to cool down and at some point it cools enough to start on first
> pull and runs good for 10 minutes.

I fail to see the problem. With a strategically placed cooler of beer, you
are being forced by nature to take appropriate breaks. This is for yourgood
health.




Posted by Sherman on July 15, 2005, 3:05 pm


wrote:

>
>
>>
>> I removed the gas filter bowl and it was clean. No change after
>> cleaning and reinstalling. Started right up and ran for 10 minutes..
>>
>> After it dies hot, it will not start or even try to start. The pull
>> compression feels about the same hot or cold. But I can't measure the
>> vacuum (or can I?)
>>
>> Has to cool down and at some point it cools enough to start on first
>> pull and runs good for 10 minutes.
>
>I fail to see the problem. With a strategically placed cooler of beer, you
>are being forced by nature to take appropriate breaks. This is for yourgood
>health.
>

Actually, I lied. My spouse does the mowing and she is getting
angry at me because the mower is dying. Don't get me wrong, I will
mow when it needs it, but in 30 years, she has never let it get long
enough to need it.

I need to get this thing diagnosed and fixed pronto.

I'm thinking I could use one of those piercing shroeder valves on the
intake manifold to measure for vacuum while I yank the rope. Wonder
if it would work. Or I could test compression thinking maybe the
compression would be different if the suction was off due to valve not
seating..

Sherman




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