Yesterday's Tractor Co.
Shop Now View Cart
   Allis Chalmers Case Farmall IH Ford 9N,2N,8N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   Traditional YT Forum ViewClassic View   RegisterRegister 
 ProfileProfile    Log inLog in 

The 300U cold water start project 5/16


 
Post new topic    
View previous topic :: View next topic  
Author Message
Dave H (MI)
Tractor Guru


Joined: 17 Dec 2003
Posts: 12434


Report to Moderator

PostPosted: Sat May 06, 2017 2:11 pm    Post subject: The 300U cold water start project 5/16 Reply to specific post Reply with quote

Nice day to work on this. Went down in the 30's last night and was still in the 40's when I got out there. So we are working with a freshly charged battery today and just a reminder it is a 12v conversion with a 12v coil.

First thing I did was run a jumper from the ignition side of the battery to the battery side of the coil. There was no noticeable attempt to start when cranked a few times.

Second I grounded the wire from the coil to the distributor (at the distributor) and, with a meter on the battery side of coil gave it a few cranks. Before cranking there was 12v, this dropped to 5v when cranked. Not even close to the 10v +/- I was looking for.

Third I inspected the wires and the knife switch that is "in line" on the battery positive side and found a couple of connections that MIGHT be an issue but probably not. I took the starter side of the switch off and took it directly to the battery, no change.

Lastly, I put my meter on the battery itself and gave a couple of cranks. 12v went down to 5v when cranking.

I have some ideas, but if I knew anything the tractor would be running already. I am interested in YOUR ideas and opinions. Any and all appreciated! Smile
 
Back to top
View user's profile
Tom Dowling
Regular


Joined: 29 Oct 2009
Posts: 472


Report to Moderator

PostPosted: Sat May 06, 2017 2:20 pm    Post subject: Re: The 300U cold water start project 5/16 Reply to specific post Reply with quote

seems to me if the engine cranks over that would rule out the starter side of things, that leaves you with ignition circuit, if you have no spark (pull a plug, put plug wire on it and ground it to bare metal, crank engine)then go through John T's elecitrcal checklist (should be in archives). If you have a nice blue spark then you are not getting fuel.
 
Back to top
View user's profile
Janicholson
Tractor Guru


Joined: 30 Jan 2004
Posts: 36293
Location: St. Cloud, MN

Report to Moderator

PostPosted: Sat May 06, 2017 5:26 pm    Post subject: Re: The 300U cold water start project 5/16 Reply to specific post Reply with quote

Even a miracle will not allow it to fire on 5 volts. The battery voltage you ingicated was on the posts of the battery I assume. If on the cable terminals, they might still be the issue. If i=on the posts, it is a bad battery even if it cranks. A 6v starter will spin it like s gyroscope. the battery voltage while cranking needs to be 10 or above!.. Jim
 
Back to top
View user's profile
Dave H (MI)
Tractor Guru


Joined: 17 Dec 2003
Posts: 12434


Report to Moderator

PostPosted: Sat May 06, 2017 5:32 pm    Post subject: Re: The 300U cold water start project 5/16 Reply to specific post Reply with quote

My thinking also. Taking it for testing tomorrow. I still have the issue of the switch and one connection heating too.
 
Back to top
View user's profile
Janicholson
Tractor Guru


Joined: 30 Jan 2004
Posts: 36293
Location: St. Cloud, MN

Report to Moderator

PostPosted: Sat May 06, 2017 5:38 pm    Post subject: Re: The 300U cold water start project 5/16 Reply to specific post Reply with quote

Use a different battery, or jump start it. If you charged the battery, and it cranks, it could also be a dragging starter, but things would get hot in a hurry.
 
Back to top
View user's profile
Dave H (MI)
Tractor Guru


Joined: 17 Dec 2003
Posts: 12434


Report to Moderator

PostPosted: Sat May 06, 2017 7:26 pm    Post subject: Re: The 300U cold water start project 5/16 Reply to specific post Reply with quote

What is starter drag? What causes it?
 
Back to top
View user's profile
MARK ROBKE
Tractor Expert


Joined: 12 Jun 2010
Posts: 2382


Report to Moderator

PostPosted: Sun May 07, 2017 10:34 am    Post subject: Re: The 300U cold water start project 5/16 Reply to specific post Reply with quote

Essentially,starter drag is a bad starter:it draws too many amps,because of defective windings.And if you put your hand on the starter motor,it would feel warm or very warm,or even too hot to touch,yet it might still crank,although slowly.A good starter,or any connections,won't get warm while cranking,unless you crank for along time,like 5 minutes.This assumes good battery and cables,of course.
Right now you need a good battery-it's probably only cranking because you probably still have the 6v starter on the tractor.
I have a 300u with 7500+ hrs on it,and it is still 6v.Dad and my uncle bought it with 75 hrs on it the year I was born.It has always cranked slow,but it has always started within a few revolutions.When you get everything right it'll start right up.Mark
 
Back to top
View user's profile
gene bender
Tractor Guru


Joined: 28 Jun 2009
Posts: 11219


Report to Moderator

PostPosted: Sun May 07, 2017 6:39 pm    Post subject: Re: The 300U cold water start project 5/16 Reply to specific post Reply with quote

Many things bad bushings and bearings bad brushes worn Bendix. I would get the starter refreshed then maybe new cables if either end gets warm when cranking but its nice to make sure the starter is in good condition first remember its over 50yrs old
 
Back to top
View user's profile
:   
Post new topic    Yesterday's Tractors Forum Index -> Farmall & International Harvester (IHC) All times are GMT - 8 Hours
Page 1 of 1

 
Jump 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 ]

YT Home  |  Forums

Modern View Forum powered by phpBB © 2001, 2005 phpBB Group

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