Yesterday's Tractor Co. 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
Classic Trucks
Kountry Life
Fordson Tractors Discussion Forum

Simms pump on Nuffield

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

01-01-2014 18:56:48

Report to Moderator

Hi all,

I have posted this on the MF site but it has been suggested that the same pump may be on a Fordson and someone here may be able to help.

I have a Nuffield DM4 with BMC engine and Simms injector pump with pneumatic (diaphragm) governor. The other day the motor revved ungoverned for a short time - probably 20 seconds but seemed much longer until I was able to shut it down! Traced the problem to a fractured diaphragm in the governor and replaced same. The diaphragm that came out was shaped like an open tin can but replaced it with a convoluted shaped one (a Nuffield/Simms replacement part) that a diesel repair centre would be fine. The rack operates freely and the cold start button sets OK.
Problem is that when attempting to start it pours white smoke out the exhaust without any detectable firing in any cylinder.Can hear the injectors creaking when turning over by hand and each cylinder appears to have the same amount of compression -(by unscrewing the decompression bolts in the head). I thought maybe the timing may have changed with the over revving so pulled the timing cover off today to check. It appears to be OK according to the manual I have - 30 chain pitches between Injector pump drive and camshaft and 34 pitches between camshaft and crankshaft sprocket marks.I am thinking perhaps next step may be to remove the injectors to make sure they are atomising OK. When the over revving event occurred I had the exhaust off as I had been working on solenoid/battery and amongst the panic was aware of a lot of flame from the open exhaust.
Thanks for any help

[Log in to Reply]   [No Email]
MF Pain

01-03-2014 23:55:29

Report to Moderator
 Re: Simms pump on Nuffield in reply to MF Pain, 01-01-2014 18:56:48  
Hi all,
Well I think I have found the problem - it looks as though the coupling on the injector pump drive slipped when the engine over revved. Apart from resetting the timing I have not as yet reassembled and tested. A pic of the timing cover removed to remind me how much more work I have done than was needed. Photo 1 (if I get them in the right order) shows the fresher paint on the coupling that alerted me to it when I finally saw it. Photo 2 shows the position of the pump timing when the crankshaft is at 28deg BTDC (correct position when marks on pump and drive should be aligned). Before resetting the pump timing I aligned the marks on the pump and the drive and checked the crankshaft position - it was about 10deg past TDC - no wonder it wasn't firing and only pouring out white smoke.
Thanks for all the help offered.




[Log in to Reply]  [No Email]

01-03-2014 00:29:31

Report to Moderator
 Re: Simms pump on Nuffield in reply to MF Pain, 01-01-2014 18:56:48  
Did you take the pump off the tractor to do the repair? If so, it is possible you got it back on the tractor 180 degrees out, all the marks line up correctly but you are on Number 4 cylinder rather than Number 1.

The symptoms you describe are just what you would get. I own a Nuffield and a Major and the diaphram is the same.

[Log in to Reply]  [No Email]
MF Pain

01-03-2014 01:48:34

Report to Moderator
 Re: Simms pump on Nuffield in reply to Majorman, 01-03-2014 00:29:31  
I did not remove the injection pump, and as the marks are all correct under the timing cover I have also ruled out sheared keys (if that is possible)



[Log in to Reply]  [No Email]

01-03-2014 07:02:40

Report to Moderator
 Re: Simms pump on Nuffield in reply to MF Pain, 01-03-2014 01:48:34  
Hi Bill,
Try asking this question on the Peatland Export Parts forum for Nuffield tractors. The chaps there are excellent and very helpful.

[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). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums

Copyright © 1997-2018 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