wonder why the engine won't turn over?

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wonder why the engine won't turn over?

Postby Medic » Sat Feb 16, 2013 3:34 pm

pulled the crank today and found a surprise

Image

think I can ben it back? JK
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Re: wonder why the engine won't turn over?

Postby Super A » Sat Feb 16, 2013 3:47 pm

WOW!!
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Re: wonder why the engine won't turn over?

Postby RUSSALL » Sat Feb 16, 2013 5:07 pm

Ouch!!
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Re: wonder why the engine won't turn over?

Postby beaconlight » Sat Feb 16, 2013 5:28 pm

That is bad enough but how is the block? and or the crankshaft?
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Re: wonder why the engine won't turn over?

Postby ricky racer » Sat Feb 16, 2013 5:55 pm

You should be able to straighten that out and get another 100,000 miles out of her!!! :lol:
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Re: wonder why the engine won't turn over?

Postby Medic » Sat Feb 16, 2013 6:14 pm

jury is still out on the block and crank. I still need to clean em up to before I can do a proper inspection. fingers crossed
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Re: wonder why the engine won't turn over?

Postby John *.?-!.* cub owner » Sat Feb 16, 2013 9:48 pm

Wow, never saw one of the letter series do that.
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Re: wonder why the engine won't turn over?

Postby Medic » Sat Feb 16, 2013 10:23 pm

I have been thinking about what caused it to bend in the first place. I assume that the piston jammed some how while the motor was running. The bearings look almost new same with the gaskets. I know that the gentlemen i bought the tractor from never got around to working on it. He bought it from the county. I am thinking that someone from the county rebuilt it just before the rod failed. While removing the cam shaft I noticed that the end opposite the timing gear has a metal plug on the outside and a matching opening on the otherside of the rear seal. This is the first A i have worked on so I dont know if that opposite side opening should have a plug as well. When i torn down the motor it didnt have a plug there. I'll post photos when i get a chance. Im thinking that maybe this plug failed and lost coolent causing the motor to over heat and the piston to seize. Any thoughts?
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Re: wonder why the engine won't turn over?

Postby John *.?-!.* cub owner » Sat Feb 16, 2013 11:40 pm

wonder if it might have been run off into some water and hydro-locked.
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Re: wonder why the engine won't turn over?

Postby Boss Hog » Sun Feb 17, 2013 3:51 am

I am going out on a limb and say the engine will be junk.
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Re: wonder why the engine won't turn over?

Postby Medic » Sun Feb 17, 2013 11:47 am

here are the plug and hole I'm talking about. does anyone know if that opening is suppose to be plugged? I can see right through the water jacket.

Image
Image
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Re: wonder why the engine won't turn over?

Postby (CUB HUT) » Sun Feb 17, 2013 12:09 pm

Yes with a freeze plug,—like the right side in photo
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Re: wonder why the engine won't turn over?

Postby Medic » Sun Feb 17, 2013 1:31 pm

thanks for the the help Cub Hut. might have been the source of the problem. It wasn't there when I split the tractor and I can find it in the bell housing. I wonder if someone forgot to install it or if it blow out. How can I tell if the block is a loss? I'll have the crank checked at our local shop.
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Re: wonder why the engine won't turn over?

Postby Eugene » Mon Feb 18, 2013 8:26 am

Medic wrote: might have been the source of the problem.
Missing freeze plug did not cause the bent connecting rod. Most likely, as John said, hydrostatic lock, water on top of the piston. Cause, cracked head or head gasket fault. Guess, typically hydrostatic lock occurs on first crank of engine during start up.

Medic wrote:It wasn't there when I split the tractor and I can find it in the bell housing. I wonder if someone forgot to install it or if it blow out. How can I tell if the block is a loss? I'll have the crank checked at our local shop.
Freeze or frost plugs frequently rust out. If you rebuild the engine, replace all of the freeze plugs.

Medic wrote:How can I tell if the block is a loss?
Since engine is on engine stand, check very carefully for internal and external cracks, breaks, faults. No obvious problems, block will need to be boiled out, have the machine shop check the block again.
I have an excuse. CRS.
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Re: wonder why the engine won't turn over?

Postby beaconlight » Mon Feb 18, 2013 9:09 am

have it magnifluxed.
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