Welcome! Please use the navigational links on your left to explore our website.

Company Logo Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Kountry Life
Tractor Talk Discussion Forum

diesel question

Welcome Guest, Log in or Register
Author  [Modern View]
Charlie M

02-23-2021 14:16:19

Report to Moderator

I have a question about a diesel engine in a mini excavator we have at our rail road museum. I'm told it has a 3 cylinder Mitsubishi diesel in it. After it runs for a while it quits easily and won't stay running when you start it until its had time to cool down a bit, then it starts up and runs fine for a while again. When it runs it runs great. When it won't stay running it acts like its not getting enough fuel. Seems like if it was a fuel filter it wouldn't run again until the filter was changed. I did see today it has a filter like people put on gas tractors coming out of the fuel tank when they replace the sediment bowl assembly. I know that can create a problem on a gas tractor, can it be a reason for our problem? Seems like something is getting too warm and causing a problem. Everything is under a hood so not open like a tractor engine would be.

[Log in to Reply]   [No Email]

02-24-2021 03:39:38

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
Charlie, your statement of "time to cool down a bit" has mislead some to think that it is overheating. You may want to clarify that.

[Log in to Reply]  [No Email]
The tractor vet

02-23-2021 16:25:00

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
While not up on Mini excavators it is a diesel engine and like our skid steer that has one of them thar plastic fuel filters it was also have a second filter SOME PLACE , But by all means change it and look for the other filter DO NOT run COLD water over the injection PUMP You will end up with a 7500 or more pounds of Scrap.

[Log in to Reply]  [No Email]
Farmer Rock

02-23-2021 15:34:54

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
If I am understanding correctly, it won't start easily when hot, and loses power at higher rpms? If so, that sounds like a bad injection pump. To verify this,next time it won't start up right away when hot, pour cool water over the injection pump, and if it starts right up, that is you problem. I would first look and make sure the lift pump is good like Steve suggested.


[Log in to Reply]  [No Email]
The tractor vet

02-23-2021 16:21:22

Report to Moderator
 Re: diesel question in reply to Farmer Rock, 02-23-2021 15:34:54  
That my boy is the fastest way to end up buying a NEW INJECTION pump and many before have done just that . Not intentionally but by accident . A guy out plowing and see's he is running hot so he runs down to the milk house and grabs a garden hose to flush out the fins on the radiator and the stream of cold water hits the injectorn pump and in a split second the pump seizes locking up the head and twisting the shaft off .NEVER tell someone to do that as it could cost then over a grand for that stunt.

[Log in to Reply]  [No Email]
Billy Shafer

02-23-2021 15:34:26

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
Is the radiator clean and letting air pass. I say this because I was called to look at a main engine. On a large RV unit. They had replaced the fuel filter,fuel lines and fuel pump. I noticed their was very little air coming out. Radiator fins were covered in trash.We soaked the fins in cleaner. Then washed them out. Ran fine after that.

[Log in to Reply]  [No Email]
Tech 7

02-23-2021 15:20:27

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
Possible tank vent issue?

[Log in to Reply]  [No Email]

02-23-2021 15:18:51

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
Classic reduced flow. It gets plenty to run at low speed, but it runs short after a little while at higher speed. After getting a break the low flow will refill the filter and chamber in the pump so the cycle starts over. The most likely obstruction is the filter. Try breaking the fuel line at the pump and catching the fuel to see if it will fill a pint in two minutes. if not open it after the filter and test, then before the filter and test. step by step until you isolate where the obstruction is. It is usually mud.

[Log in to Reply]  [No Email]

02-23-2021 15:18:24

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
Try running it with the muffler off

[Log in to Reply]  [No Email]

02-23-2021 15:16:25

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
Is there a lift pump between the tank and the injection pump?

If so check it like you would a gas fuel pump, but plug the line going into the injection pump so it doesn't get air in it. Disconnect the outlet line, spin the starter, see what it pumps. Catch what it pumps, look for water.

Is there a return line to the tank? On some systems, if that line gets clogged they will act like what yours is doing. Usually a clogged return is the result of something failed in the pump and sent plastic or rubber down the line.

[Log in to Reply]  [No Email]
Tx Jim

02-23-2021 14:36:29

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
I suggest to install a new filter & check for good fuel flow from tank to inj pump. It's also possible that the tank isn't venting creating a vacuum in tank restricting fuel flow. Try operating with shop towel covering fuel tank neck.

[Log in to Reply]  [No Email]
Traditional Farmer

02-23-2021 14:20:21

Report to Moderator
 Re: diesel question in reply to Charlie M, 02-23-2021 14:16:19  
Probably something in the tank restricting the fuel flow.

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

Hop to:

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

Today's Featured Article - Product Review - by Staff. When we finally checked out the 3000 PSI North Star, the whole story chaned. This unit was equipped with an 11 HP Honda engine with fuel shutoff, adjustable flow and optional syphon degreaser dispenser. It didn't have a pressure release or electric start to facilitate easy starting but according to the instructions, simply pulling on the trigger while cranking was sufficient. This method of starting proved more than adequate and kept the cost down on the unit. It had all the important ... [Read Article]

Latest Ad: 1967 Ford 3000 [More Ads]

Copyright © 1997-2021 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