Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Farmall & IHC Tractors Discussion Forum
:

Spun bearing

Welcome Guest, Log in or Register
Author 
Johann

06-22-2005 04:55:50




Report to Moderator

Spun a rod bearing in 236 D. I suppose it was not installed correctly. Anyhow , some of the spun bearing residue is on the face of the other bearings, rod and mains. They kind of look like a freckle faced kid. Does this require that the bearings be replaced, or can they be wiped down? Also, can the mains be replaced without pulling the crank, or do I have to pull the crank? Then does this require new seals in the front and back? Please advise, as I may be in for a long and expensive day> Thanks.

[Log in to Reply]   [No Email]
captaink

06-22-2005 07:24:51




Report to Moderator
 Re: Spun bearing in reply to Johann, 06-22-2005 04:55:50  
I’ll give you a few thoughts to ponder as you make your decision. First and foremost I believe is to determine why that bearing spun. You noted that you suppose that it was not installed correctly, but you really need to make sure. I say this because I found a spun bearing in an engine once and came to find out that it had a cracked block and anti-freeze was getting into the oil. The bearing was put in correctly, but I believe that since this was in a low usage engine the antifreeze caused the bearing to “stick” once and then it spun. I would suggest you have the rods checked at a machine shop to make sure that the bearing area in the rod is not out of round or otherwise distorted.

Those freckle faced bearings are that way from foreign material being imbedded into the soft bearing material. This foreign material was pumped throughout the engine including the cam bearings and oil pump. If only the softer bearing material was in the oil, there was probably no damage to the pump or other steel parts like the crankshaft, but if some of the backing shell of the bearing came loose, then harder steel filings may have caused damage elsewhere in the engine. Another thing to consider is that there may still be pieces of foreign material floating around in the oil galleys somewhere. I would also be suspect of the camshaft bearings looking like the crankshaft bearings.

I strongly suggest (especially if this is a newer rebuild) that you completely tear the engine back down and thoroughly clean and inspect the parts especially the cam bearings for filings or have it done at a machine shop. I would also strongly recommend having the crankshaft at least polished by a machine shop to ensure that there are no nicks in it from the material passing through it. I would consider these expenses cheap insurance so that your engine runs a long time after you are done. I had a bad experience once when I tired to “cut a corner” on an engine rebuild and lived to regret it…I like working on engines but not enough to do it over again right away! :>)

My nickels worth…good luck!

[Log in to Reply]  [No Email]
ET

06-22-2005 06:44:20




Report to Moderator
 Re: Spun bearing in reply to Johann, 06-22-2005 04:55:50  
You would be better off to replace all the main and rod bearings. You will need to clean all the oil passages and galleys. Clean out the oil filter base and bypass valve, oil cooler if it has one and clean the oil pump. The main seals might be ok if you don't hurt them during the rest of the job. On the other side if you carefully clean the the bearing inserts and they don't have any smeared babit they will probably be ok. Particles inbeded in the bearing shell are not good they can move later on and cause engine damage. Small scratches hold more oil and don't Realy make a big problem. You might end up with a grenade just waiting to blow or a tough engine that just keeps on going. Good Luck

[Log in to Reply]  [No Email]
El Toro

06-22-2005 05:06:59




Report to Moderator
 Re: Spun bearing in reply to Johann, 06-22-2005 04:55:50  
What is the condition of the rod journal on the crankshaft? To pull the crankshaft would require
pulling the engine since your clutch disc, pressure plate and flywheel are attached to the crankshaft. If the rod journal surface is rough
from the spun bearing, probably will require the crankshaft to be ground undersize. Hal



[Log in to Reply]  [No Email]
Johann

06-22-2005 06:09:01




Report to Moderator
 Re: Spun bearing in reply to El Toro, 06-22-2005 05:06:59  
The engine is pulled and on a stand. The crank has been ground. I am wondering if I should just replace the whole set of bearing as I have access to the underside now. So far the crank is not scored, but I Wonder if the bearing residue would score it. All the bearings were new and sized for the ground crank. The whole engine is a project gone south because of too many Chiefs and I am trying to salvage it as cost effective as possible, but I don't want to pull the engine again. Thanks for any advice.

[Log in to Reply]  [No Email]
riverbend

06-22-2005 07:01:32




Report to Moderator
 Re: Spun bearing in reply to Johann, 06-22-2005 06:09:01  
It does not sound good if metal from the spun bearing has circulated through the engine. A set of bearings would be cheap insurance compared to pulling the motor to do the job again.



[Log in to Reply]  [No Email]
El Toro

06-22-2005 06:24:49




Report to Moderator
 Re: Spun bearing in reply to Johann, 06-22-2005 06:09:01  
Since you have the engine removed I would have the block degreased and have all the oil passages
cleaned so everything is free of any metal shavings.

You should have that crankshaft measured at your
local auto machine shop to see if std. or undersize inserts are required. I would replace all of them with new bearings.

You also should clean that oil pump and any other component that may have some metal shavings.
Your oil pump circulates the oil throughout the engine and needs to be free of any foreign material. Hal

[Log in to Reply]  [No Email]
BobOhio

06-22-2005 06:23:41




Report to Moderator
 Re: Spun bearing in reply to Johann, 06-22-2005 06:09:01  
I would go through with plasti-gauge and measure all of the bearing clearances to be safe. Maybe the crank journal for that rod was not ground to proper size to match the bearing?



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy