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 

Crawler OC3 won't Start . Timing And compression questi

Goto page 1, 2  Next

 
Post new topic    
View previous topic :: View next topic  
Author Message
alejandroflores
New User


Joined: 20 Jul 2021
Posts: 9


Report to Moderator

PostPosted: Tue Jul 20, 2021 6:53 pm    Post subject: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

My Name is Alex and I am trying to help my father-in-law get his Crawler going and have some questions that hope you can help.

It is and OC3 with an XB4000 distributor. Found the distributor bad. Changed the coil and condesor per spec and it worked and is spark is seen on all 4 plugs. Followed the Zimmerman tech tips about timing. Believe I got that correct.
When I didn't get compression on #1 with the thumb over the plug hole I got a gage and found that a hand crack yielded no pressure but a rev or two with the starter yield 30 lbs.

Occasionally I will get a back fire through the carb...but nothing that sounds like starting.

Should I go after timing or compression?
I read a post that talked about filling the pistons up with ATF and soaking for a week. Wasn't sure I understand how to do that and then how to get it out.

Seems like a have spark, tried starting fluid, inthink I have timing... other then an occasional smoke out the exhaust... I have nothing to show for it. Any help would be greatly appreciated.
 
Back to top
View user's profile
old
Tractor Guru


Joined: 12 Mar 2000
Posts: 90159
Location: Lake of the Ozarks area of MO

Report to Moderator

PostPosted: Tue Jul 20, 2021 7:38 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

30PSI is way to low for it to run. As for the ATF that is simple pull a plug at a time and pour ATF into the spark plug hole. Put the plug back in and move to the next plug. Then after a week pull ALL the plugs but make sure to keep track of them for the firing order. Spin it over with the starter and using 12 volts is best. Yes it will make a mess but unless you can figure out a way to put a hose in each plug hole that is pretty much the only way to do it. BTDT many times and even on an OC3 I had a few years back
 
Back to top
View user's profile
scootergmc
Long Time User


Joined: 30 Mar 2015
Posts: 837


Report to Moderator

PostPosted: Tue Jul 20, 2021 9:07 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote


Valves could be stuck as well.
 
Back to top
View user's profile
J.Wondergem
Tractor Guru


Joined: 05 Mar 2009
Posts: 6313


Report to Moderator

PostPosted: Wed Jul 21, 2021 5:04 am    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote


I agree with checking the valves. Make sure they're all gaped right and are working. If not pull the head.
 
Back to top
View user's profile
mechknit
Regular


Joined: 03 Dec 2016
Posts: 40


Report to Moderator

PostPosted: Wed Jul 21, 2021 5:48 am    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

Check for stuck valves. Valve-in-block engines have a tendency to stick when left unused for a period of time. Those engines are tough little buggers
though. Had an OC3 on the farm years back. Used it for pulling a spray rig when nothing else could get on the field(muck farming). The operator would
wind the little Hercules up and let 'er go across the field. Very rarely would the machine get stuck. You could hear the straight-pipe exhaust bark
from quite a distance!
 
Back to top
View user's profile
Janicholson
Tractor Guru


Joined: 30 Jan 2004
Posts: 37086
Location: St. Cloud, MN

Report to Moderator

PostPosted: Wed Jul 21, 2021 7:00 am    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

An OC3 engine is going to need all 4 cylinders to be functional. My family owned one for 30 years. Doing an informal cylinder leak down test is easy
and will diagnose the problem. The process can use your compression gauge adapter to work. (this assumes you have, or access to, an air compressor)
the piston in #1 cylinder should be positioned at TDC compression. Put the transmission in high gear, and rope back the track brakes to prevent
motion. Open the throttle, and make sure the choke is not on. Apply 100 PSI or more to the spark plug hole. The entering air will leak out of the
cylinder through the fault causing the low compression. Listening in the muffler, intake to the carb (remove the rubber hose is best to hear), and oil
breather.
If air from exhaust, it is the exhaust valve, if from the carb opening, an intake valve, if from the breather, it is past the rings. This allows
knowledge to be ahead of teardown/repair. Stuck valves or valves with a chip of carbon under them can be assessed by removing the cover over the
lifters on the side of the engine. With the #1 at TDC both valve clearances should be near specification. If one is near zero clearance it is likely
a burnt valve. If it is a wide gap it could be carbon holding the valve open. Jim
 
Back to top
View user's profile
alejandroflores
New User


Joined: 20 Jul 2021
Posts: 9


Report to Moderator

PostPosted: Wed Jul 21, 2021 4:38 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote


Thank you very much. I really appreciate your help and time.
Does the ATF give a temporary compression solution just to let one know where to spend more time or does the soaking take care of some problems?

Thanks again
 
Back to top
View user's profile
alejandroflores
New User


Joined: 20 Jul 2021
Posts: 9


Report to Moderator

PostPosted: Wed Jul 21, 2021 4:46 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

Thank you for helping . I am going to look into that for sure. Thanks for reach out and helping.
 
Back to top
View user's profile
alejandroflores
New User


Joined: 20 Jul 2021
Posts: 9


Report to Moderator

PostPosted: Wed Jul 21, 2021 4:48 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

Thank you Sir. I appreciate your help and will check on it.
 
Back to top
View user's profile
alejandroflores
New User


Joined: 20 Jul 2021
Posts: 9


Report to Moderator

PostPosted: Wed Jul 21, 2021 4:51 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

Thank you sir. I will look into it. I haven't heard it run yet... but I will be sure to where ear plugs. Thanks
 
Back to top
View user's profile
alejandroflores
New User


Joined: 20 Jul 2021
Posts: 9


Report to Moderator

PostPosted: Wed Jul 21, 2021 5:01 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote


Janicholson
Thanks for your help and that detailed information. I am going to do as well.
May I ask.... you mention the 3 points the compressed air could travel.
Exhaust (exhaust valve), carb opening (intake) and breather ( piston Rings)
It's the breather I had a question about. The breather attached to the carb opening? It seems like the same location... am I mistaken?


I assume you would then TDC cylinder No.2,3,4 and listen for the same things and take note.

Thanks again.
 
Back to top
View user's profile
alejandroflores
New User


Joined: 20 Jul 2021
Posts: 9


Report to Moderator

PostPosted: Wed Jul 21, 2021 5:06 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

I am new to the forum so I thought my many thanks yous were to each off you individually.

I just wanted to express my genuine gratitude for your help.

I once read book that said "great people share information and are interested in helping others to be better and to succeed"

Thanks.. you guys are great people.
 
Back to top
View user's profile
old
Tractor Guru


Joined: 12 Mar 2000
Posts: 90159
Location: Lake of the Ozarks area of MO

Report to Moderator

PostPosted: Wed Jul 21, 2021 6:29 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

ATF frees up sticking rings and valve so the compression goes up and stay up unless it is then parked for years again.
 
Back to top
View user's profile
old
Tractor Guru


Joined: 12 Mar 2000
Posts: 90159
Location: Lake of the Ozarks area of MO

Report to Moderator

PostPosted: Wed Jul 21, 2021 6:31 pm    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

Air cleaner is an oil bath type and yes the tube going to the air intake of the carb come off the air cleaner and if it is clogged up or the oil cup is full of mud and water it will cause problems
 
Back to top
View user's profile
Olliejunkie
Tractor Guru


Joined: 22 May 2016
Posts: 4299
Location: Eugene Oregon

Report to Moderator

PostPosted: Thu Jul 22, 2021 8:43 am    Post subject: Re: Crawler OC3 won't Start . Timing And compression questi Reply to specific post Reply with quote

Did you test compression wet and dry? Put a little oil in cylinder and recheck.if it's the rings compression should rise. Regardless if it has sat for long soaking the rings with oil is a good place to start.
 
Back to top
View user's profile
:   
Post new topic    Yesterday's Tractors Forum Index -> Oliver, Cletrac, Coop and Cockshutt All times are GMT - 8 Hours
Goto page 1, 2  Next
Page 1 of 2

 
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