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CountryRock

Briggs & Stratton 11hp on a GT2500 issue

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CountryRock

I have a Briggs & Stratton 11hp, model 252417-0245-01.  When I turn it over by hand, via the flywheel cover, it rotates about a half turn and then stops dead on something, does it no matter which way I turn it.  Does this sound like a broken connecting rod or is it something else, that I could possibly fix?  If it's not fixable, what could I use to repower the tractor it's on, a 1981 GT2500?  I have 2 of these tractors, one of them does run, I would like to get this one running if possible.  Thanks.

IMG_20180811_142410342.jpg

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The Gman

It sounds like a conn. rod. Can you see down the plug hole at all, if the piston is moving? 

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gwest_ca

Could be a stuck valve from sitting idle too long. Don't force it.

 

Garry

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CountryRock

I would like to have the service manual for this engine if possible.  Thanks.

 

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CountryRock

I could see the intake valve moving, couldn't see the piston.

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gwest_ca

Engine service manual

Garry

  • Excellent 2

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CountryRock

Thank You, Garry!

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The Gman

Might just as well pull the head. That won't hurt. Then you can see the piston and the valves

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CountryRock

I think I'm going to do that shortly.

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BOB ELLISON

I just had the same problem on a engine that sat for a long time. Turns out to be the piston ring was stuck to the piston and would not move in or out. It seized up the piston and would not allow it to move but a little. I hope this is your problem because it can be fixed by soaking.  The only way to tell is to open it up.

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CountryRock

Head is off, piston and valves all move.  Was a good mouse nest under the shroud, but nothing jamming the flywheel.

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The Gman

Good news.:handgestures-thumbupright:

Maybe a good time to lap/check the valve clearance.

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CountryRock

It still jams both ways.

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CountryRock

Under the breather cover.

IMG_20180811_171411527_LL.jpg

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cleat

I would pull the flywheel and make sure nothing is jammed under it, maybe stuck to a magnet.

 

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The Gman

Maybe it's the angle but that exhaust spring doesn't look right. It's banked to the right.

Almost like the keeper plate is shifted part way out of the slot.

For sure pull the flywheel.

Edited by The Gman

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CountryRock

The exhaust valve does look off.  I don't have tools to pull the flywheel.

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Marv

Do you have pecans, hickory nuts, or walnuts at your place? You may just have one rolling around in the fly wheel and jamming things up. "Mice".

Marv

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CountryRock
9 minutes ago, Marv said:

Do you have pecans, hickory nuts, or walnuts at your place? You may just have one rolling around in the fly wheel and jamming things up. "Mice".

Marv

None of those around.  I don't think anything is jamming the flywheel.

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CountryRock

Could it be something with the cam shaft gear?

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gwest_ca
11 hours ago, CountryRock said:

Could it be something with the cam shaft gear?

Sure.

Check the pto side of the engine to make sure something over there isn't blocking it.

Sure sounds solid whatever it is.

You can likely push the top of the intake valve spring back into position.

What is odd to me is if that had happened while running there should be substantial damage.

What can happen internally when not running?

Maybe remove engine from frame and turn it over (upside down) and see if it changes.

 

Garry

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The Gman

If you can't find anything external, pto/flywheel then you're gonaa have bite the bullet, drain the oil and remove the sump. Flywheel ,magnet(s) can come loose and get jambed. I listened to the video a few times and it sure sounds like a hard stop. A puller is best to remove a flywheel but you can do it with a pry bar under the flywheel for leverage and striking the nut with a small sledge. AFTER THE NUT IS LOOSENED AND RAISED A THREAD OR TWO ABOVE THE END OF THE CRANK. Search for some U-Tube videos on this method to see if you're comfortable with this first.

Keep us posted

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gwest_ca

If you happen to remove the drive pulley on the output side here is the procedure to preload the thrust bearing - necessary on the B&S engines.

Garry

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Marv
1 hour ago, gwest_ca said:

If you happen to remove the drive pulley on the output side here is the procedure to preload the thrust bearing - necessary on the B&S engines.

Garry

Very important.

Marv

 

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