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Re: AC C noisy rods

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Dick L Question

09-10-2003 07:47:42




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(The cranks has been ground to .020 so everything still looks very good.) When was the crankshaft ground? Was it shimmed properly? If it was not shimmed correctly and you had more than the .002 clearance you can still have a knock even though the crank was ground and had new bearing installed. An engine does not have to knock for a very long time to get beat out of round. You need to check the crank to make sure it is not out of round and if it is still ok then install new bearings and make sure it is shimmed properly for .015 to .002 clearance.

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Allen H

09-10-2003 19:51:44




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 Re: Re: AC C noisy rods in reply to Dick L Question?, 09-10-2003 07:47:42  
The way I understand it, the engine was rebuilt about 8 years ago then was unused for 5 or 6 years. When they attempted to use the tractor the rods became noisy so it was again retired. The crank lookes as if it was ground yesterday. I was surprised at the great condition and was expecting the worse. How can I check that the oil is coming through the cam?



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Dick L

09-11-2003 14:07:57




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 Re: Re: Re: AC C noisy rods in reply to Allen H, 09-10-2003 19:51:44  
Check for oil pressuer and flow first. I hate to tell you how many tractors I have purchased that I was told a story that resembles what you were told. The latest was the G I restored last winter. (The engine was rebuilt and was not used much after and was stored because of the bad health of the owner. Dont start now but cant be much wrong.) When I took the engine apart I found that it needed all new exaust valves and all the guides were sloppy. The crankshaft was out of round and had to be ground. The cylinders had to be bored as they were wore out of round as well.
To your question as to checking the oil squirting out of the cam onto the rods. I would say other than putting in a window in the side of the block I know of no easy way.
If it were my tractor and it aint, I would put the engine on an engine stand, pull it apart, and check every thing out. To start with first you might take the oil line off where it runs from the oil pump to the head and see it you have oil pressure there. If you do you should have oil down the center of the cam. If someone in the (rebuild?) thought it needed a different cam and put one in out of a late year CA that had pressure thru the crank to the rods there will be no holes in the cam. My pulling C I drilled the crank myself for oil and used one of these cams. If in the (rebuild?) they needed a rod and used one from one of those later engines it would not have the hole for the oil to get into the rod bearings. The rods are the same except for the oil hole.
Rebuilds that have been done by people that think they know is much different than one done by someone that does know the details. This is why I would take it totally apart and check the details.

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Allen H

09-11-2003 19:27:33




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 Re: Re: Re: Re: AC C noisy rods in reply to Dick L, 09-11-2003 14:07:57  
Dick, I checked the rods for the oil holes and also noticed holes in the cam directly inline with the rods. Also the cam is dripping oil so I assume this oil is residual in the pump and is pushed through the cam when I turn the engine. Also I checked the crank for out of round and it is ok. Using plastigauge the clearance is at .005 which is excessive on # 3. I wonder if the rebuild used the wrong shims? The present shims measure .020. What is your thoughts on this?

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Dick L Looks Like

09-12-2003 07:28:39




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 Re: Re: Re: Re: Re: AC C noisy rods in reply to Allen H, 09-11-2003 19:27:33  
You found the problem. Good Deal! If the OEM shims were used they would be the kind you can peel off layers of the shim to get the correct clearance. If they were cut from .020 shim stock you will eather buy the OEM shims from someone like Sandy Lake or buy .005, .002, and .001 shim stock and cut the needed shims to get the clearance for each rod. If the rods were shimed wrong you will most likely find the mains that way also. Same clearance is correct for both.
Another thing to watch for is when you get close to the correct clearance and turn the crank over and it starts to get hard to turn you will have to file the ends of the bearing inserts slightly to keep them from acting as a brake. You will hear the term bearing crush, the need to be tight against each other, but to much crush causes the bearings to clamp down on the crankshaft. Shiming bearings can take a bunch of time the first time, might even make you say nasty things about how things were done in the 40's and before.

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Allen H

09-12-2003 19:48:20




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 Re: Re: Re: Re: Re: Re: AC C noisy rods in reply to Dick L Looks Like, 09-12-2003 07:28:39  
Dick, thanks for all the help.



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