Yesterday's Tractor Co. Parts for Farm Tractors - Compare our Prices!
Click Here or call 800-853-2651 
   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 in to check your private messagesLog in to check your private messages   Log inLog in 

Compression Test

Goto page 1, 2  Next
 
Post new topic    
View previous topic :: View next topic  
Author Message
Tom Bond
Regular


Joined: 02 Sep 2009
Posts: 473
Location: Illinois

Report to Moderator

PostPosted: Wed Jan 16, 2013 2:20 pm    Post subject: Compression Test Reply to specific post Reply with quote

Would it be to my benefit at all to do a compression test before I pull my cylinder head to help me diagnose any other issues? Don't currently have a test kit but as I get more into these old timers, I figure I might need one somewhere along the line. Was going to check out Northern Tool and run over to the local Sears to see what they offer.
 
Back to top
View user's profile
souNdguy
Tractor Guru


Joined: 20 Aug 2002
Posts: 54054


Report to Moderator

PostPosted: Wed Jan 16, 2013 2:26 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

by all means DO perform a comp test / wet-dry BEFORE cracking the head. once you crack the head.. your empirical data is lost.

toooo mannnny people rip the head off before doing some practical observation.

now.. whether the comp tests actually help with your particular situation remains to be seen without more info ont he issue.. however it never hurts to know a before #
 
Back to top
View user's profile
old
Tractor Guru


Joined: 12 Mar 2000
Posts: 57166
Location: Lake of the Ozarks area of MO

Report to Moderator

PostPosted: Wed Jan 16, 2013 2:50 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

You would probably be better of doing a leak down test instead of a compression test. By doing the leak down you would find which cylinder has the bad gasket area or crack in the head etc.
 
Back to top
View user's profile
souNdguy
Tractor Guru


Joined: 20 Aug 2002
Posts: 54054


Report to Moderator

PostPosted: Wed Jan 16, 2013 3:36 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

do both.. more tests the better..
 
Back to top
View user's profile
old
Tractor Guru


Joined: 12 Mar 2000
Posts: 57166
Location: Lake of the Ozarks area of MO

Report to Moderator

PostPosted: Wed Jan 16, 2013 6:25 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

Very true plus with a leak down test you can maybe see bubbles in the cooling system that you may not see by doing the compression test.
 
Back to top
View user's profile
Tom Bond
Regular


Joined: 02 Sep 2009
Posts: 473
Location: Illinois

Report to Moderator

PostPosted: Wed Jan 16, 2013 6:44 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

Already spotted the bubbles in the radiator along with some tan milky oil in the crank case. Thats whats leaning me towards the headgasket. (hopefully thats all) Have a gearhead at the shop lending me a compression tester to do a dry/wet test.
 
Back to top
View user's profile
old
Tractor Guru


Joined: 12 Mar 2000
Posts: 57166
Location: Lake of the Ozarks area of MO

Report to Moderator

PostPosted: Wed Jan 16, 2013 6:53 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

Gear head so is that what you call us guys who try to help you??? As for the bubbles in the radiator a leak down test would tell you which cylinder the bubbles come from so you then know where to better look for cracks and all if you do not see for sure a blown head gasket. By the way just giving you a hard time on the gear head thing since back when I was in High school I never took any shop classes
 
Back to top
View user's profile
Tom Bond
Regular


Joined: 02 Sep 2009
Posts: 473
Location: Illinois

Report to Moderator

PostPosted: Wed Jan 16, 2013 7:28 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

hahahahah. I hear you Old. Just a figure of speech. I'm thinking of investing in a leak down test. Me and the "gearhead" figure between the 2 of us, him with a compression tester and me with a leak down tester, we could narrow problems down much more precisely. First things first though. The compression test and see what the #'s look like. I'll post them sometime next week when I get the tests done.
 
Back to top
View user's profile
old
Tractor Guru


Joined: 12 Mar 2000
Posts: 57166
Location: Lake of the Ozarks area of MO

Report to Moderator

PostPosted: Wed Jan 16, 2013 7:37 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

When I was in high school I was more of the science nerd type doing the electronics stuff and the chemical stuff. Still wish I could find some sulfur and some salt peter on bulk by the way. But then in the navy I went the other way and was teaching guys how to keep there cars running and doing engine rebuilds and I was an electronics technician then
 
Back to top
View user's profile
john in la
Tractor Guru


Joined: 28 Mar 2004
Posts: 6923
Location: Bedico, La.

Report to Moderator

PostPosted: Wed Jan 16, 2013 7:50 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

A leak down tester requires a air compressor to use it and some do not have that ability. It will also confirm a blown head gasket by showing bubbles in the radiator that way you can get pump cavitation out of the possible source of bubbles you saw already.
If you do not want to spend the money on a one time use for a leak down tester you can buy a replacement hose for a leak down tester and use it to shoot air into the cylinder. This will not show leak down but will pressurize the cylinder so you can see if bubbles appear in the radiator.

While a compression test will show what cylinder is bad it does not narrow down the possible causes. This is where a leak down test comes in. Applying air to the cylinder lets you know if it is a head gasket (bubbles in radiator) an exhaust/intake valve (hissing air in tail pipe or intake) or a bad piston/rings (pressure in crankcase)

With all that said I really do not think you need a leak down test. We already know if the compression test shows a bad cylinder it is most likely going to be a head gasket or a cracked head because bubbles in radiator have been seen.
 
Back to top
View user's profile
john in la
Tractor Guru


Joined: 28 Mar 2004
Posts: 6923
Location: Bedico, La.

Report to Moderator

PostPosted: Wed Jan 16, 2013 8:07 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

"You would probably be better of doing a leak down test instead of a compression test. By doing the leak down you would find which cylinder has the bad gasket area or crack in the head etc."

Maybe I am reading this wrong but it sure seems to me you are trying to say he should do a leak down test because a compression test will NOT show him what cylinder is bad.

"As for the bubbles in the radiator a leak down test would tell you which cylinder the bubbles come from so you then know where to better look for cracks"

There it is again. Use a leak down test to find the cylinder with the problem.

You do not really think a leak down test is any better than a compression test at pinpointing a problem in a cylinder and telling you what cylinder the problem is in. DO YOU???????????
 
Back to top
View user's profile
old
Tractor Guru


Joined: 12 Mar 2000
Posts: 57166
Location: Lake of the Ozarks area of MO

Report to Moderator

PostPosted: Wed Jan 16, 2013 8:58 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

Yes I do since a leak down test compresses air into each cylinder r one at a time so then you watch a gauge to see which cylinder will not hold compression over X number of minutes and in doing so you can watch the radiator for air/bubbles. As in you charge the cylinder up to X number of PSI and see where you loose the PSI and how fast
 
Back to top
View user's profile
souNdguy
Tractor Guru


Joined: 20 Aug 2002
Posts: 54054


Report to Moderator

PostPosted: Thu Jan 17, 2013 5:10 am    Post subject: Re: Compression Test Reply to specific post Reply with quote

you can make a cyl adapter with an old spark plug and an air fitting.

bust the insulator out and remov ethe electrodes.. and then solder/braze/weld a male qd on it. perhaps an angle fitting first if planned to use on an N.. coud weld on a female threaded 90 and then just screw inthe male qd air adapter.. etc.

poor mans leak tester. then just about any air pump or air up tank will work for ya.,
 
Back to top
View user's profile
Hobo,NC
Tractor Guru


Joined: 14 Jun 2007
Posts: 12232


Report to Moderator

PostPosted: Thu Jan 17, 2013 5:19 am    Post subject: Re: Compression Test Reply to specific post Reply with quote


All you need to do is pressurize each cylinder with air regulated @100 PSI are less NO MORE)

The other test are not a waist of time but probably will not help locate a leak that does not affect performance... The pressure difference will most likely be to small on a engine that runs good...

Normally the first thing I would do is pressurize the cooling system with plugs removed... Are remove the plugs over night and look in each hole the next day for coolant and do a spin test and look for coolant spiting out a plug hole either in liquid are vapor form...

NOW WHY,,, so I know were to considerate my efforts once I remove the head..
I normally am dealing with a leak of this type on a engine less than 10 years old so the head gasket has not aged out,, the time and parts money required for a lets take as guess is 10 times are more than on your tractor...

Old tractors,,, for the record head gaskets do not last forever you may find it leaking on all cylinders if so that's a good thing replace the gasket its served its time... If this is the case normally a re-torque will resolve the issue that tells you to replace the gasket its served its time and on the way out...
 
Back to top
View user's profile
Tom Bond
Regular


Joined: 02 Sep 2009
Posts: 473
Location: Illinois

Report to Moderator

PostPosted: Thu Jan 17, 2013 1:17 pm    Post subject: Re: Compression Test Reply to specific post Reply with quote

After all the suggestions and odds are, I'll only be using a leak down tester on rare occasions, I decided to save myself about $100 and use SoundGuys idea and build a poor mans tester. I'll just pressurize each cyclinder and diagnose from there. I took a couple different spark plugs and gutted them out, then silver soldered on a male air chuck to each. Added an "O"ring and ready to go. I'll let the air compressor cycle off and bring up the regulator slowly to 100# and listen for leaks or watch for bubbles in the radiator. Here's what they look like.
 
Back to top
View user's profile
Display posts from previous:   
Post new topic    Yesterday's Tractors Forum Index -> Ford All times are GMT - 8 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
TRACTOR   PARTS TRACTOR   MANUALS
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F).  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.

YT Home  |  Forums Home

Copyright © 1997-2014 Yesterday's Tractor Co.

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