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

Discussion Forum
:

Oil Pressure/Compression Relationship

Welcome Guest, Log in or Register
Author 
8Ngine

02-19-2001 02:02:19




Report to Moderator

Is there a direct relationship between oil pressure and compression? 49 8N starts right up at 40PSI and levels off to 20PSI when warm. Runs nicely at no throttle, occasional miss, but nothing to speak of. Compression on all cylinders is right around 90 but am experiencing missing and noticable power loss at mid throttle under load.

Installed Autolite 437's yesterday and it ran good, but today was considerably colder and experienced the problem. Don't know if there's a thermostat, but when checking fluids before starting noticed considerable milky icing in oil filler tube. It melts after the engine has run for awhile but even after running for a couple of hours, it's still there. Could it be the cold (-8 wind chill) causing the missing/power loss, or is there some adjustment I should make to handle the hotter plugs. Looking for correlation between new plugs/compression/oil pressure. I realize the power loss could be caused by one/all three of these things, or something else entirely, but plugs are new, gapped correctly, compression is ok and oil pressure is good. ???

Thank you for your continuing help.

[Log in to Reply]   [No Email]
bj/8N/mt

02-19-2001 07:12:42




Report to Moderator
 Re: Oil Pressure/Compression Relationship in reply to 8Ngine, 02-19-2001 02:02:19  
sounds like it is time to throw ten bucks at it and put on a set of plug wires.

get the metal core kind and solder the crimp on ends

oil pressure and compression are unrelated and once it makes it to operating temp there is also no power loss worth measuring that is ambient air temp related



[Log in to Reply]  [No Email]
chuck

02-19-2001 06:49:50




Report to Moderator
 Re: Oil Pressure/Compression Relationship in reply to 8Ngine, 02-19-2001 02:02:19  
My 52 8N began missing recently and I checked the plugs and the gas and everything was alright. After a lot of trouble shooting to no avail, I pulled the coil high tension wire. The end in the distributor cap was severely corroded (side distributor). Replaced the wire and cleaned the cap and the miss went away. Don't forget to check both ends of the high tension wires!

chuck
436244



[Log in to Reply]  [No Email]
Ed Gooding (VA)

02-19-2001 05:04:47




Report to Moderator
 Re: Oil Pressure/Compression Relationship in reply to 8Ngine, 02-19-2001 02:02:19  
Your oil pressure is fine and your compression is adequate. Neither is contributing to your miss, in my opinion. A miss under load would make me suspect the spark plugs or spark plug wires. Since you've replaced your plugs, I'd suggest checking and/or replacing your wires, too. You could have gotten a bad plug, right out of the box. I just put a set of RapidFire plugs in my Suburban and had a nasty, intermittent miss under load after the tune up. Pulled the plugs and found the electrode on one was wobbly! I didn't catch it when I installed them because these are pre-gapped, Platinum plugs and I didn't have to gap them. If I had, I would have caught it before I installed it.

Good luck with it..... ..Ed
'52 8N475798

[Log in to Reply]  [No Email]
Claus

02-19-2001 04:51:51




Report to Moderator
 Re: Oil Pressure/Compression Relationship in reply to 8Ngine, 02-19-2001 02:02:19  
There is no relationship between compression and oil pressure. 90#s is the lowest recommended compression according to Ford. To see if your tractor has a thermostat, squeeze the upper radiator hose and feel for one. If you feel something solid inside the hose, most likely yours has one. Cold weather does not cause power loss. Give your tractor a tuneup and see what happens. Check your oil for moisture.
Happy Motoring
Claus

[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