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
Tractor Town
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
Today's Tractors
Garden Tractors
Kountry Life
Minneapolis Moline Tractors Discussion Forum

MM 602 coolant in oil

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

03-03-2019 11:57:45

Report to Moderator

Hi all, asking for my brother he bought a MM 602 earlier this winter it runs good looks fair to good had been sitting for some time anyway hes used a little bit and notice coolant is getting into the oil it does not miss and runs good he's wondering if it could be the water pump seal leaking?

GB in MN

[Log in to Reply]   [No Email]

04-06-2019 18:53:31

Report to Moderator
 Re: MM 602 coolant in oil in reply to MNGB, 03-03-2019 11:57:45  
An update on my brothers MM M602 he cleaned the weep hole in the water pump no coolant came so after running the engine more he decided to remove the heads and found nothing wrong with the head gaskets and could see no obvious cracks in the heads so he took them to an engine shop and after testing found nothing. So he figured there must be a crack in the block(s) he filled the blocks with coolant and it never went down in over a week so started to remove the blocks got the rod cap off the first rod went and turned the crack to get at #2 and some coolant ran down he figured it had to be the water pump and pulled it and the shaft was very worn got the water pump rebuilt so now its to reassemble the engine. The disassembly of the engine was not completely for nothing he did find a broke valve spring so that is repaired.

GB in MN

[Log in to Reply]  [No Email]
Alan K

03-04-2019 21:38:58

Report to Moderator
 Re: MM 602 coolant in oil in reply to MNGB, 03-03-2019 11:57:45  
If the tractor sits for a while, you can drain the engine oil out and remove the filter and the steel canister it sits in (held in by two screws I believe) You can then look towards the upper left corner of the engine which is where the water pump is located. If you see a small "trail" through the oil stains in the crankcase it is coming from your water pump seal. That is what I did with my M5 that I bought out of a grove. It is still running from several years ago yet. As MMDEL mentioned, if it has been sitting it may seal up again. I would clean the weep hole by the water pump and give it 1 or 2 shots of grease while running. Dont over grease it though.

[Log in to Reply]  [No Email]

03-04-2019 10:06:37

Report to Moderator
 Re: MM 602 coolant in oil in reply to MNGB, 03-03-2019 11:57:45  
Thanks for the replies. jocco that was his first thoughts but hes going to check and see if it might be the water pump he doesn't have a heated shop and right now its too darn cold

Thanks again GB in MN

[Log in to Reply]  [No Email]

03-04-2019 06:31:29

Report to Moderator
 Re: MM 602 coolant in oil in reply to MNGB, 03-03-2019 11:57:45  
Not what you want to hear but maybe a head gasket or crack somewhere. There is some tests for these issues.

[Log in to Reply]  [No Email]

03-03-2019 13:05:53

Report to Moderator
 Re: MM 602 coolant in oil in reply to MNGB, 03-03-2019 11:57:45  
More than likely. There is a weep hole in the bottom of the casting between the water pump and the timing gear area where the water is supposed to leak out in case of a seal failure. But this is always plugged up with grease from greasing the pump bushing. Take a piece of baling wire and dig around up in the hole and see if you get any water drops. If so you probably found your answer. But I would not get excited about ripping the pump off immediately. If it sat for years as you say the seal was probably stuck to the housing. And when it was first turned over it broke loose and the two surfaces are not now sealed, or mated and are now seeping coolant. Clean the weep hole as best as you can and run the tractor for a period of time off and on for a few weeks there is a good chance the pump will re seat it self. A couple of days work in the field might do wonders. Always crack the oil pan plug before you start it in the morning and drain the water off.


[Log in to Reply]  [No Email]

03-03-2019 11:58:34

Report to Moderator
 Re: MM 602 coolant in oil in reply to MNGB, 03-03-2019 11:57:45  
Forgot this is a gas tractor

GB in MN

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

Hop to:

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). We have the parts you need to repair your tractor - the right parts. Our fast shipping, low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums

Copyright © 1997-2019 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