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Lawn mower repair question. digitkgb 08-19-2006
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Posted by Rich256 on August 19, 2006, 4:49 pm
digitkgb@yahoo.com wrote:
> Hi.
> Yesterday while I was mowing the lawn, my mower engine suddenly
> stopped. The blade continued to spin until it slowed to a stop. It did
> not strike any objects. It was working fine up to this point.
>
> When I attempt to start the mower by pulling the string, the blade will
> spin quietly, but I do not hear the engine try to engage. Additionally,
> it feels "loose" when I pull the string; previously, I could hear the
> engine cranking, but not anymore.
>
> I'm not very experienced with lawn mower or small engine repair, but I
> did some basic troubleshooting by looking at guides on the web. The
> flywheel key, and the blade adaptor key both seem to be intact. The gas
> is fresh. Oil was recently filled.
>
> My mower is a Craftsman, model 143.996504 with a 6.5 Eager-1 (Tecumseh)
> 4-cycle engine (917.377431).
>
> Any ideas?
>
> Thanks.
>

I will go with the lost compression. If you are up to it you could pull
off the head and see if a valve is broke. I do remember one one rare
occasion a valve stuck open. Just took some lubricant to get it moving
again.

AppliancePartsPros.com, Inc.
Posted by Stormin Mormon on August 19, 2006, 5:57 pm
Pull the spark plug wire off, and secure it well away from the spark
plug.

Leave the plug in.

Tip the mower on its side, and try to turn the blade backwards of the
usual direction.

If it spins freely, scrap the mower, and get another one. If it binds
and gets hard to turn at one or two places in the revolution, then you
have compression. Proceed to look for other problems.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
.

Hi.
Yesterday while I was mowing the lawn, my mower engine suddenly
stopped. The blade continued to spin until it slowed to a stop. It did
not strike any objects. It was working fine up to this point.

When I attempt to start the mower by pulling the string, the blade
will
spin quietly, but I do not hear the engine try to engage.
Additionally,
it feels "loose" when I pull the string; previously, I could hear the
engine cranking, but not anymore.

I'm not very experienced with lawn mower or small engine repair, but I
did some basic troubleshooting by looking at guides on the web. The
flywheel key, and the blade adaptor key both seem to be intact. The
gas
is fresh. Oil was recently filled.

My mower is a Craftsman, model 143.996504 with a 6.5 Eager-1
(Tecumseh)
4-cycle engine (917.377431).

Any ideas?

Thanks.



Posted by mm on August 21, 2006, 11:42 am
On Sat, 19 Aug 2006 21:57:12 GMT, "Stormin Mormon"

>Pull the spark plug wire off, and secure it well away from the spark
>plug.
>
>Leave the plug in.
>
>Tip the mower on its side, and try to turn the blade backwards of the
>usual direction.

I thought with the plug in, the blade could kick back when released or
when it slipped out of one's hand. Not enough to cut off a finger,
but enough to hurt, no?

And the engine won't start because the spark plug wire is off and
"secured" "well away", if it really is. The first time, it probably
will be. The second or third time, one might forget. And I used to
hook the wire to the fuel line, which in an old mower was a convenient
place, but sometimes it sprang loose and went back to within a quarter
inch of the plug, close enough for the engine to run.

And anyone who is pushing the blade backwards might want to push it
forwards too, not realizing it would be more likely to start.

One could use a stick to push the blade backwards. God only gave us
10 fingers.

>If it spins freely, scrap the mower, and get another one. If it binds
>and gets hard to turn at one or two places in the revolution, then you
>have compression. Proceed to look for other problems.


Posted by Don Young on August 19, 2006, 11:02 pm

> Hi.
> Yesterday while I was mowing the lawn, my mower engine suddenly
> stopped. The blade continued to spin until it slowed to a stop. It did
> not strike any objects. It was working fine up to this point.
>
> When I attempt to start the mower by pulling the string, the blade will
> spin quietly, but I do not hear the engine try to engage. Additionally,
> it feels "loose" when I pull the string; previously, I could hear the
> engine cranking, but not anymore.
>
> I'm not very experienced with lawn mower or small engine repair, but I
> did some basic troubleshooting by looking at guides on the web. The
> flywheel key, and the blade adaptor key both seem to be intact. The gas
> is fresh. Oil was recently filled.
>
> My mower is a Craftsman, model 143.996504 with a 6.5 Eager-1 (Tecumseh)
> 4-cycle engine (917.377431).
>
> Any ideas?
>
> Thanks.
>
The other posters have some good advice, but from your description it sounds
possible to me that your engine has a connecting rod broken at the
crankshaft end. That is based on engine spinning freely without any sounds.
The engine is likely beyond economical repair.

There are some other possibilities, such as a valve being stuck open, that
are easily repaired. If it spins over easily there can be no compression. I
would have someone knowledgeable have a look at it if possible.

Don Young



Posted by John Lawrence on August 20, 2006, 2:33 pm
Sound advice.
>
>> Hi.
>> Yesterday while I was mowing the lawn, my mower engine suddenly
>> stopped. The blade continued to spin until it slowed to a stop. It did
>> not strike any objects. It was working fine up to this point.
>>
>> When I attempt to start the mower by pulling the string, the blade will
>> spin quietly, but I do not hear the engine try to engage. Additionally,
>> it feels "loose" when I pull the string; previously, I could hear the
>> engine cranking, but not anymore.
>>
>> I'm not very experienced with lawn mower or small engine repair, but I
>> did some basic troubleshooting by looking at guides on the web. The
>> flywheel key, and the blade adaptor key both seem to be intact. The gas
>> is fresh. Oil was recently filled.
>>
>> My mower is a Craftsman, model 143.996504 with a 6.5 Eager-1 (Tecumseh)
>> 4-cycle engine (917.377431).
>>
>> Any ideas?
>>
>> Thanks.
>>
> The other posters have some good advice, but from your description it
> sounds possible to me that your engine has a connecting rod broken at the
> crankshaft end. That is based on engine spinning freely without any
> sounds. The engine is likely beyond economical repair.
>
> There are some other possibilities, such as a valve being stuck open, that
> are easily repaired. If it spins over easily there can be no compression.
> I would have someone knowledgeable have a look at it if possible.
>
> Don Young
>
>



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