Posted by RAB on August 02, 2009 at 14:06:24 from (195.93.21.10):
In Reply to: Engine rebuild? posted by Bill in IL on August 02, 2009 at 07:00:10:
Some good info below but perhaps something here might help.
If no internal micrometer, check ring gap in the worn part of bore and at the bottom in the unworn part. The ring gap difference can be worked back to bore wear.
If the cylinders are oval, new rings will struggle to seat.
Side clearance of rings, particularly in the top groove is important. Rings may well 'oil pump' if sloppy. Pistons can be reconditioned for this fault but probably the cost and other wear factors would make it uneconomical.
Look at the bore with a light from the other end. You will see if the reflection is distorted (oval bores).
Some top rings can be obtained (or perhaps not, these days) with a step to avoid the ridge problem.
The workshop manual or a generic manual will give the serviceable limits for the engine.
You said 'Where else could all this blow by be coming from?'
Well, was the timing too far advanced? Has the head been shaved previously (raised compression ratio), Higher compression pistons fitted? Rings sticking in piston grooves?
Actually sounds like it is worn to some extent, probably oval. For you to check out. For you to decide how far to go. My view is - if you can get the parts, do the job properly, unless just a parade tractor.
Fixing the blow-by may well mean sorting the crank, as extra load imposed by a strong engine may well find any weakness in the lubrication system and bottom end bearings, if worked hard.
As is often said 'do it properly;only do it once'.
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 ]
Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
... [Read Article]
Latest Ad:
one 8n and one 9n tractor. totaly restored,pretty much everything is new. one 6ft blade good shape.
[More Ads]
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.
