Runs but horrible knock.

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Thackery
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Runs but horrible knock.

Postby Thackery » Fri May 27, 2016 7:06 pm

So, I picked up a non running Cub, PO said engine stuck a couple of weeks ago.
Was able to turn the engine with a crank.
Got it home and was able to get it running in a few minutes, good oil pressure, but a horrible knock at the front of the block.
Pulled the oil pan, found interesting bits of ferrous materials. See pic.
Checked #1 connector rod nuts and one was finger loose.
Pulled the connector rod cap and this what I found. See pic 2.
So the bearing is really gone.
Question is, what now.
New bearing, turn crank, etc, etc.
Put in a different engine, which I already have.
2016-05-27 20.01.27.jpg

2016-05-27 20.02.15.jpg
1953 Cub, Sickle Mower, 42" Mower, Cultivators, 189 Double Plow, 54 Blade, Grader Blade
1968 Lo-Boy w/1000 Loader, 1957 Lo-Boy w/FH, FH Disc, FH Potato Plow.

Eugene
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Re: Runs but horrible knock.

Postby Eugene » Fri May 27, 2016 7:42 pm

Thackery wrote:Put in a different engine, which I already have.
Put in the different engine. Put the current engine on the bench or engine stand. Once disassembled, measured, and inspected, determine if the engine is worth rebuilding.
I have an excuse. CRS.

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John *.?-!.* cub owner
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Re: Runs but horrible knock.

Postby John *.?-!.* cub owner » Fri May 27, 2016 7:44 pm

I would remove the engine and pull the crank to take to an automotive machine shop. Crank may or may not be too far gone to grind. If you do not have a puller to remove the crank pulley, take the front plate with crank, the machine shop will have the needed puller. Do NOT pull on the edges of the pulley, it must be gripped near the center. While this far along, may as well look into rings or boring and pistons, as well as valve job. It's only money. :lol:
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SouthernOutlaw
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Re: Runs but horrible knock.

Postby SouthernOutlaw » Fri May 27, 2016 8:35 pm

My first question would be is how good is the replacement engine. If it is in good running condition I would say replace it. If not, rebuilt it instead of the one in the tractor now. If the replacement engine you have is strong, the take the engine in the tractor out, and take your time rebuilding it, and you have a good engine when you decide to bring home another non running cub.

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LRiddle
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Re: Runs but horrible knock.

Postby LRiddle » Sat May 28, 2016 1:30 pm

I think I'd go with the back up. Then you can take your time to build a good solid motor as another spare.
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Super A
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Re: Runs but horrible knock.

Postby Super A » Sat May 28, 2016 2:32 pm

John *.?-!.* cub owner wrote:I would remove the engine and pull the crank to take to an automotive machine shop. Crank may or may not be too far gone to grind. If you do not have a puller to remove the crank pulley, take the front plate with crank, the machine shop will have the needed puller. Do NOT pull on the edges of the pulley, it must be gripped near the center. While this far along, may as well look into rings or boring and pistons, as well as valve job. It's only money. :lol:


What John said. Who knows what the replacement engine will be like. At least if you break it on down you will know what you are dealing with.

Al
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