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

Crawlers, Dozers, Loaders & Backhoes Discussion Forum

gas in engine oil

Welcome Guest, Log in or Register
Author 
crawlercrow

02-13-2004 11:25:13




Report to Moderator

Can one of you experts out there tell me how fuel is getting into the oilpan on my 40 crawler?Do I have a valve stuck open or something more sinister?The engine ran fine when I first started it but lately is running rough and backfiring. Thanks for any help you give. crawlercrow.




[Log in to Reply]   [No Email]
Brokenwrench

02-14-2004 10:51:40




Report to Moderator
 Re: gas in engine oil in reply to crawlercrow, 02-13-2004 11:25:13  
Gas can get into the oilpan from running too rich,missing on one cylinder,or stuck choke. This will only put a slight amount of gas in the oil. If it is a couple quarts overfull,then I would suspect the needle and seat in the carb,letting gas run into the engine when turned off. The gas tank is higher than the engine,and will gravity feed into the cylinders and then the crankcase. I make a habit of turning off the gas on my tractors when not in use even with rebuilt carbs. Try going to an autolite or ac spark plug,possibly one heat range higher,but address the gas in the oil first,with an oil and filter change.

[Log in to Reply]  [No Email]
crawlercrow

02-14-2004 17:55:32




Report to Moderator
 Re: Re: gas in engine oil in reply to Brokenwrench, 02-14-2004 10:51:40  
Thanks to all who posted advice on this problem.I think your valued responces have put me on the right track.This gas problem had started since a recent carb overhaul.I have since changed the oil with only traces of gas present and will be upgrading to hotter plugs.I had not heard about the washer added to the plugs before but will try it as well.All wires are copper core when I restored this crawler.It has only run a few times for short periods (hence the plug fouling)It also had new points.condensor&roter. Thanks again to all!!

[Log in to Reply]  [No Email]
RAB

02-15-2004 11:42:53




Report to Moderator
 Re: Re: Re: gas in engine oil in reply to crawlercrow, 02-14-2004 17:55:32  
You will not be 'upgrading' by putting hotter plugs in it, although you may be OK. If it doesn't need them you may cause detonation problems and damage the engine, if you work it hard and hot. Hotter plugs simply have a reduced heat dissipation path through to the cylinder head and can glow hot enough to pre-ignite the cylinder charge. Be careful. Curing the disease is ALWAYS better than hiding the symptoms. Regards, RAB

[Log in to Reply]  [No Email]
clyde

02-14-2004 08:35:51




Report to Moderator
 Re: gas in engine oil in reply to crawlercrow, 02-13-2004 11:25:13  
take a compression check, that will tell you if it' a valve, if not check your coil they loose spark when hot if they are going bad and cause it to die out, let it set for awhile and it will run again. check the fuel pump diaphram it will cause fuel to leak into oil pan, try an electric pump after changing oil to see if it continues, that gas in the oil will wipe your mains out in short order. good luck clyde

[Log in to Reply]  [No Email]
Bob

02-13-2004 19:10:16




Report to Moderator
 Re: gas in engine oil in reply to crawlercrow, 02-13-2004 11:25:13  
I have a 450G Case Crawler Loader. I had the same problem with fuel getting in my oil in the oil pan. It got in there through the fuel pump diaphram. The crawler held about 20 gallons of gas. I filled it at the end of the day and the next day when I checked the fuel it was empty. When I started it, it started right up but blew oil out the exhaust pipe. I also had this happen on a tractor. Only that time it went through the carburetor because the float had stuck. Hope this will help. Good Luck.

[Log in to Reply]  [No Email]
crawlercrow

02-13-2004 12:37:47




Report to Moderator
 Re: gas in engine oil in reply to crawlercrow, 02-13-2004 11:25:13  
I think you might have something there. I put new Champion H-10 plugs in recently, they foul-up quickly.Should I switch to a hotter plug,maybe H-12's or J-14's.Also,would like to know why it sometimes fires on only one cylinder when starting but fires on both when the plugwire is pulled back on the sparkplug.When you push the plugwire fully on it will cut back to one.These are new accel plug wires,Seems to run best with a loose wire on one sparkplug. Thanks again, Crawlercrow

[Log in to Reply]  [No Email]
RAB

02-13-2004 13:26:47




Report to Moderator
 Re: Re: gas in engine oil in reply to crawlercrow, 02-13-2004 12:37:47  
You need to know why they are fouling first. If the engine is being over-fuelled, then the plugs may not be the problem. If it is using a lot of oil, then the route to take may be an overhaul. The reason for the misfire getting less when you pull a plug lead off slightly is that the voltage rise at the end of the lead is already sufficient to jump that gap and is then applied to the plug gap. With the wire on there is some leakage before a sufficient voltage rise accross the gap. May be poor spark energy, low HT voltage, or poor insulation somewhere. What colour is your spark. It should be blue and not yellow. Fouled plugs will have a lower resistance to earth and may be leaking to earth as quickly as the energy is arriving! Is this a mag system? If so are these plugwires actual copper wire or are they resistor type, or carbon fibre leads? I would suggest you look at the carburation first and make sure it is in spec. before making wholesale changes on the ignition side. I would base this on gas usually being lost to the exhaust if unburned, unless the engine is too cold. Kero burning engines certainly will fill the sump, but in the case of a gas engine the fuel should be volatilised quite easily. Regards, RAB

[Log in to Reply]  [No Email]
jed

02-13-2004 11:56:51




Report to Moderator
 Re: gas in engine oil in reply to crawlercrow, 02-13-2004 11:25:13  
A valve must be hanging up. If an exhaust valve is staying closed or partially closed that will allow fuel to pool on the piston and and then run back down to the crankcase. The missing sounds like a valve also.



[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