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wonder why the engine won't turn over?

Posted: Sat Feb 16, 2013 3:34 pm
by Medic
pulled the crank today and found a surprise

Image

think I can ben it back? JK

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

Posted: Sat Feb 16, 2013 3:47 pm
by Super A
WOW!!

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

Posted: Sat Feb 16, 2013 5:07 pm
by RUSSALL
Ouch!!

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

Posted: Sat Feb 16, 2013 5:28 pm
by beaconlight
That is bad enough but how is the block? and or the crankshaft?

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

Posted: Sat Feb 16, 2013 5:55 pm
by ricky racer
You should be able to straighten that out and get another 100,000 miles out of her!!! :lol:

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

Posted: Sat Feb 16, 2013 6:14 pm
by Medic
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

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

Posted: Sat Feb 16, 2013 9:48 pm
by John *.?-!.* cub owner
Wow, never saw one of the letter series do that.

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

Posted: Sat Feb 16, 2013 10:23 pm
by Medic
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?

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

Posted: Sat Feb 16, 2013 11:40 pm
by John *.?-!.* cub owner
wonder if it might have been run off into some water and hydro-locked.

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

Posted: Sun Feb 17, 2013 3:51 am
by Boss Hog
I am going out on a limb and say the engine will be junk.

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

Posted: Sun Feb 17, 2013 11:47 am
by Medic
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

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

Posted: Sun Feb 17, 2013 12:09 pm
by (CUB HUT)
Yes with a freeze plug,—like the right side in photo

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

Posted: Sun Feb 17, 2013 1:31 pm
by Medic
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.

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

Posted: Mon Feb 18, 2013 8:26 am
by Eugene
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.

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

Posted: Mon Feb 18, 2013 9:09 am
by beaconlight
have it magnifluxed.