No Compression

All non-Cub/Cadet/IH/Farmall/Case tractor and machinery discussions.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.

No Compression

Postby Cub-Bud » Tue Jan 11, 2005 8:36 pm

A few months ago, I put an overhaul kit in my '45 B Farmall; pistons, rings sleeves, etc. Everything was done by the book. I decided today to adjust the valves. I found TDC on the compression stroke on 1 and set the appropriate valves. When I started turning the hand crank with my finger in 4 plug hole, no compression. :shock: I have good compression on 1 and 3 but, there is none on 2 and 4. I have two guesses:

1) The piston rings are not orientated correctly on 2 and 4 pistons, or

2) The piston rings on 2 and 4 are stuck to the pistons.

Either way, I am still going to have to remove the head and pan and push these two pistons out to find the problem :evil:

Any other ideas I might consider :?:
"Never forget where it is you come from, or you may find yourself someplace you don't want to be"

Greg Norman
User avatar
Cub-Bud
Team Cub
Team Cub
 
Posts: 3220
Joined: Sun Feb 02, 2003 6:30 pm
Location: MS, Pope
Zip Code: 38658
eBay ID: Cub-Bud
Circle of Safety Award
Circle of Safety: Y

Postby Bigdog » Tue Jan 11, 2005 8:41 pm

You might add a little Kroil and see if they free up.
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.

My wife says I don't listen to her. - - - - - - - - Or something like that!

http://www.cubtug.com
User avatar
Bigdog
Team Cub
Team Cub
 
Posts: 23814
Joined: Sun Feb 02, 2003 12:50 pm
Location: OH, Stoutsville
Zip Code: 43154
Circle of Safety Award
Circle of Safety: Y

Postby Jim Becker » Tue Jan 11, 2005 8:57 pm

I find it hard to believe that the rings would stick if they were oiled at all during assembly and the engine hasn't been run.

I hate to ask this, because I know you know how to do it. But are you ABSOLUTELY SURE you adjusted the the valves on cylinders 2 and 4 with the engine in the right position? With cylinder 1 up on compression, adjust valves 1, 2, 3 and 5. Rotate 1 full revolution and adjust 4, 6, 7 and 8. (count valves from front of engine).
User avatar
Jim Becker
Team Cub
Team Cub
 
Posts: 11853
Joined: Sun Feb 02, 2003 3:14 pm
Location: TX/MN
Zip Code: 75048
Circle of Safety Award
Circle of Safety: Y

Postby George Willer » Tue Jan 11, 2005 9:05 pm

C.B.,

I find a problem with valves easier to believe than stuck new rings. I have had valves stick in new guides if they set for a little while.

I'd remove the valve cover and check carefully in there first. Oops... the cover must already be off! Oil the valve stems and work them a bit and then re-check the clearance in the order Jim suggested.

Even if you followed the wrong order it could only result in too much clearance.
George Willer
http://gwill.net

The most affectionate creature in the world is a wet dog. Ambrose Bierce
User avatar
George Willer
Cub Pro
Cub Pro
 
Posts: 7011
Joined: Sun Feb 02, 2003 9:36 pm
Location: OHIO, Fremont
Zip Code: 43420
Circle of Safety Award
Circle of Safety: Y

Postby Cub-Bud » Tue Jan 11, 2005 9:41 pm

"I hate to ask this, because I know you know how to do it. But are you ABSOLUTELY SURE you adjusted the the valves on cylinders 2 and 4 with the engine in the right position? With cylinder 1 up on compression, adjust valves 1, 2, 3 and 5. Rotate 1 full revolution and adjust 4, 6, 7 and 8. (count valves from front of engine"

Jim, I did adjust valves 1, 2, 3, and 5 with 1 on TDC compression stroke. I never could find the compression stroke on 4 to adjust valves 4,6,7, and 8. One full revolution means #4 TDC compression stroke, right :?: :oops:

"I'd remove the valve cover and check carefully in there first. Oops... the cover must already be off! Oil the valve stems and work them a bit and then re-check the clearance in the order Jim suggested."

George, I have lubed the valve stems with MMO. I hope you are right.

I was talking with Russ Leggitt on the phone a moment ago. He said something that got me to thinking. I suspect I might have some rockers on these cylinders holding the vlaves open preventing compression. :roll: I am going to check this and report back. :wink:
"Never forget where it is you come from, or you may find yourself someplace you don't want to be"

Greg Norman
User avatar
Cub-Bud
Team Cub
Team Cub
 
Posts: 3220
Joined: Sun Feb 02, 2003 6:30 pm
Location: MS, Pope
Zip Code: 38658
eBay ID: Cub-Bud
Circle of Safety Award
Circle of Safety: Y

Postby Cub-Bud » Tue Jan 11, 2005 9:56 pm

Well, I am sorry to have bothered all of you but, I just now returned from going out and backing off on the adjustment on valves 4, 6, 7, and 8 and I now have compression. :D :D :D Of course, the MMO could have un-stuck those valves....who knows :?:
"Never forget where it is you come from, or you may find yourself someplace you don't want to be"

Greg Norman
User avatar
Cub-Bud
Team Cub
Team Cub
 
Posts: 3220
Joined: Sun Feb 02, 2003 6:30 pm
Location: MS, Pope
Zip Code: 38658
eBay ID: Cub-Bud
Circle of Safety Award
Circle of Safety: Y

Postby George Willer » Tue Jan 11, 2005 10:34 pm

C.B.,

Glad you found the problem! It sure beats fixing what ain't broke. Quicker too. :lol:
George Willer
http://gwill.net

The most affectionate creature in the world is a wet dog. Ambrose Bierce
User avatar
George Willer
Cub Pro
Cub Pro
 
Posts: 7011
Joined: Sun Feb 02, 2003 9:36 pm
Location: OHIO, Fremont
Zip Code: 43420
Circle of Safety Award
Circle of Safety: Y

Postby Jim Becker » Tue Jan 11, 2005 11:45 pm

Glad you got to the bottom of it. I usually manage to think of the worst possible situation when something like this comes up too.

And yes, cylinders 1 and 4 are 1/2 way around the firing order from each other, so one full revolution of the crank takes you from TDC on compression of one to the other.
User avatar
Jim Becker
Team Cub
Team Cub
 
Posts: 11853
Joined: Sun Feb 02, 2003 3:14 pm
Location: TX/MN
Zip Code: 75048
Circle of Safety Award
Circle of Safety: Y


Return to Other Tractors and Machinery

Who is online

Users browsing this forum: No registered users and 2 guests