I have a 1947 farmall MD witch I bought and got It running I put a universal oil pressure gauge on, it runs 60-80 lbs when its first starts but after a few hours of running it drops to less then 10 lbs of pressure, it has no blowbye, and dosnt use much oil. I was told that its probaly a seal in the oil pump. Just wandering what anyone else thought.
- Thread starter Kolton
- Start date
Wesley Stephens
Member
I've had that issue with several engines of different types, and it usually indicated worn main bearings.
Allan in NE
Well-known Member
Kolton,
Your engine needs a set of bearings; rods, mains and camshaft. At 10 lbs, I sure wouldn't work it hard until it's fixed.
Also, if it doesn't have any blowby, the engine is probably all gunked up inside, as crankcase ventilation is a very normal and necessary thing.
Allan
Your engine needs a set of bearings; rods, mains and camshaft. At 10 lbs, I sure wouldn't work it hard until it's fixed.
Also, if it doesn't have any blowby, the engine is probably all gunked up inside, as crankcase ventilation is a very normal and necessary thing.
Allan
Before I would pull all the bearings out or look at them, I would pull the plate off of the bottom of the oil pump and see how worn that is. If the gears in the oil pump have much of any end play that's where you'll loose the pressure. You can put new bearings in or check the clearance on the old bearings but if your pump has too much clearance you just wasted all that time and money on bearings for nothing.
You just can't check one thing, you need to check everything in the oil circuit. I put together a Farmall H tractor and the bearings had 3.5 thousands clearance and the oil pressure is fine. I also checked the oil pump and had to resurface the bottom plate in the oil pump. I've got execellent oil pressure even after running an hour or more.
Let us know what you find.
You just can't check one thing, you need to check everything in the oil circuit. I put together a Farmall H tractor and the bearings had 3.5 thousands clearance and the oil pressure is fine. I also checked the oil pump and had to resurface the bottom plate in the oil pump. I've got execellent oil pressure even after running an hour or more.
Let us know what you find.
caterpillar guy
Well-known Member
It has just got a bad gsaket in the oil pump. Very common thing in those old IH's just pull the pan and bottom off the oil pump and the gasket will be leaking just use a thin like paper grocery sack thick gasket and away you go after replacing the pan and oil.
Anonymous-0
Well-known Member
Try a 15 40 oil in it.Shell Rotella is a good choice.
Janicholson
Well-known Member
Repair the oil pump first. Flat sand the cover to make it hold a gasket. 320 grit, then 400, to smooth it (use a flat plate of glass for a sanding surface. Pump end play is .0005" to .001" Plastigauge works if you are careful, shims that are used to put in between the gears and end plate to determine when it locks up (rotating by hand, and using .001" shim stock tightening the cover bolts gently till it locks, or keeps turning) JimN
Similar threads
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.
Copyright © 1997-2024 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