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Ford 9N, 2N & 8N Discussion Forum
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rod bearings

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508n

05-06-2005 03:20:21




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Used plastiguage on the bearings today got .025. I guess i don't have a rod knock. But something in there is knocking. Gonna replace the bearings while it apart no.4 doesn't look to good to me. and wrist pins all feel good.




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508n

05-07-2005 01:54:51




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 Re: rod bearings in reply to 508n, 05-06-2005 03:20:21  
sorry all...didn't mean to sound as dumb as I really am sometimes. bearings are .0025 not .025. but head gasket was ready to go and manifold gasket was leaking on no.1. just cleaned everything up and put it back together. replaced bottom rope seals and ended my crankshaft leaks. puurs like a kitten now. can also get it to idle at 400 instead of 620.This is pretty much a play tractor since I only have about 3 acres to bh once a month.Might tear it down this winter and do it right, or wait about 10 years, depends on ambition. Thanks for everybodys help.

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Cap-N-ID

05-06-2005 08:51:50




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 Re: rod bearings in reply to 508n, 05-06-2005 03:20:21  
Earlier you mentioned that there was a lot of carbon buildup on the pistons and head. If you haven't cleaned it off already take a good look at the pistons and be sure the carbon covered piston wasn't hitting the head somewhere. Excess carbon buildup can cause a "knock" in the engine. HTH
---Cap---



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ZANE

05-06-2005 06:32:02




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 Re: rod bearings in reply to 508n, 05-06-2005 03:20:21  
If you actually have .025 clearance in the rod bearing it sure will produce a knock. You wouldn't need plasti gauge to determine it either. You would be able to move the rod cap back and for the while it is still torqued to the specs and connected to the crankshaft. If it does have .025 clearance the crank journal will be damaged also you can bet and the crank will need to be re ground or replaced. .025 is a lot and if it is in fact that much you won't be able to buy bearings that would clear the crankshaft.

If it is .0025 you are good to go with a new set of bearings.

Zane

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Dan

05-06-2005 04:27:21




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 Re: rod bearings in reply to 508n, 05-06-2005 03:20:21  
Ummm - I hpoe you meant to say your clearances are .0025 not .025. If it is .025 you are about 5 times over the wear limit...

Dan



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Rob

05-06-2005 04:24:31




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 Re: rod bearings in reply to 508n, 05-06-2005 03:20:21  
If you have a insert that "doesn"t look good" you take it into an auto machine shop and show them what you got. A good hand can "read" the bearing and recommend what should be done, if anything.
If he says he can"t tell you then go to another shop. Basically, if you have even wear, side-to-side, with light scoring and no tears your crank is ok. Pitting is another consideration but is likely not a problem, just evidence of dirty or wet oil. Take your oil pump along for a pro look see also.
Light scoring can be corrected by dressing up a crank with emery cloth 1" roll, like you"re shining your shoes; just be sure you work all sides evenly by timing or counting. You can get the roll of emery cloth in the plumbing section of a Home Depot or hardware store. It takes a little elbow grease to dress up that hard crank but you can avoid spending money at the machine shop and yet end up with a fine bearing surface.
Check the piston skirt clearance, maybe piston slap is what you hear, probably not. Maybe a loose sleeve.
Why don"t you know which cylinder is noisy? Did you listen with a screwdriver or stethoscope? Grumpy question...sorry, it"s early and clearly you didn"t. Too bad because you should be knowing just wear to look.

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Bob

05-06-2005 07:49:28




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 Re: rod bearings in reply to Rob, 05-06-2005 04:24:31  
Emery cloth is too darn coarse for a crank journal. Crocus cloth is the recommended product for polishing a crank.



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Rob

05-06-2005 08:31:11




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 Re: rod bearings in reply to Bob, 05-06-2005 07:49:28  
You"re right about that. I polish it up with crocus cloth. Way to go.



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Dan

05-06-2005 04:30:50




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 Re: rod bearings in reply to Rob, 05-06-2005 04:24:31  
The noise stops when he pulls #1 cylinder - this was his first troubleshooting a few days ago.

Dan



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Rob

05-06-2005 04:41:52




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 Re: rod bearings in reply to Dan, 05-06-2005 04:30:50  
Hard to tell without a screwdriver if it"s top or bottom on #1 but if the bearing insert is ok and everything else is copacetic a guy might just put a new sleeve in there or R&R that one with some sticky on it. Not sure the best way to go on that or how to confirm a sleeve is loose, just have to figure it is after a process of elimination.



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Dan

05-06-2005 04:46:32




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 Re: rod bearings in reply to Rob, 05-06-2005 04:41:52  
I always heard if a sleeve was loose you could see it move up and down with the piston if you had the head off. That might be worth a try.

Dan



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Rob

05-06-2005 04:53:52




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 Re: rod bearings in reply to Dan, 05-06-2005 04:46:32  
If it"s loose enough I"m sure you can. I imagine a sleeve can fail to move on the bench but knock in operation. Maybe not, but with a knock an no other problem evident, one pretty much has to assume it"s a loose sleeve even if it doesn"t move on the bench.
Maybe a bad wrist pin bushing but an inspection should show that. I don"t know what a loose wrist pin sounds like.



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