How To Eyeball Piston ring Size

Farmall H, HV & Super H, 300 & 350, 1939-1958

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.
photoman63
Posts: 6
Joined: Sat May 07, 2016 12:10 pm
Zip Code: 77049

How To Eyeball Piston ring Size

Postby photoman63 » Wed May 18, 2016 7:49 am

Good day to all you red tractor folks,
My father-in-law is passing down one of his many farmalls to his daughter, (my wife) But I am the one who will be rebuilding the motor. He says it smokes a little, and just needs a ring job. I have rebuilt a motor once, about 30 years ago, I think I can do it. I just need help knowing what sized piston rings to get. As far as I know, the motor is all original, and never been cracked open. With that being said, the father-in-law said going one size over should do the trick. Any thoughts or help in this matter would help me out allot.
Thanks in advance.
May the sun be at your back, and the grass discharge be down wind

outdoors4evr
5+ Years
5+ Years
Posts: 1203
Joined: Tue Jul 22, 2008 12:44 pm
Zip Code: 48423
Tractors Owned: 184
Location: Davison, MI

Re: How To Eyeball Piston ring Size

Postby outdoors4evr » Wed May 18, 2016 8:28 am

Measure it. Don't guess.
184 w/ Creeper & 3-Point
IH 3160a Mower
IH Model 15 Tiller

User avatar
ricky racer
10+ Years
10+ Years
Posts: 4036
Joined: Wed Sep 12, 2007 8:40 pm
Zip Code: 49120
Circle of Safety: Y
Location: Niles / Buchanan, Michigan

Re: How To Eyeball Piston ring Size

Postby ricky racer » Wed May 18, 2016 10:40 am

outdoors4evr wrote:Measure it. Don't guess.

:Dito: :Dito:
1929 Farmall Regular
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 16247
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: How To Eyeball Piston ring Size

Postby Eugene » Mon May 23, 2016 9:36 am

photoman63 wrote:The father-in-law said going one size over should do the trick.
There is a good chance that the engine has been overhauled at least once and may or may not be "standard". One problem is that replacement sleeve and piston kits have a slightly larger bore than the factory standard.

I'm assuming one size over means ring size. You need to check the ring end gap before installing rings on the piston.

If you are going to do a ring job, might as well replace the rod and main bearings, and lap the valves.

As previously stated, measure. Measure before purchasing any parts.
I have an excuse. CRS.

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 16247
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: How To Eyeball Piston ring Size

Postby Eugene » Mon May 23, 2016 10:26 am

Eugene wrote:
photoman63 wrote:The father-in-law said going one size over should do the trick.
There is a good chance that the engine has been overhauled at least once and may or may not be "standard". One problem is that replacement sleeve and piston kits have a slightly larger bore than the factory standard.

I'm assuming one size over means ring size. You need to check the ring end gap before installing rings on the piston.

If you are going to do a ring job, might as well replace the rod and main bearings, and lap the valves.

As previously stated, measure. Measure before purchasing any parts.
Edit: You didn't indicate which model Farmall tractor you have. There are parts and service manuals for your tractor. On line advertisers for tractor parts frequently have free catalogs. The free catalogs frequently list parts by model number and sometimes tractor serial number.
I have an excuse. CRS.

photoman63
Posts: 6
Joined: Sat May 07, 2016 12:10 pm
Zip Code: 77049

Re: How To Eyeball Piston ring Size

Postby photoman63 » Mon May 23, 2016 1:51 pm

Thanks for the posts, and yes! I will measure the cylinders for proper piston ring size. I want to do out right. It is a farmall H. Not sure the year yet. The engine hasn't been ran in several years now. are there steps I should follow before just cranking her up? I plan on cleaning fuel tank, and pulling sparkplugs and just spinning crank shafts to make sure it moves freely. I think I should try and get it running before to take it apart for the ring swap. any thoughts, of things I should check?

Matt Kirsch
10+ Years
10+ Years
Posts: 4454
Joined: Tue Jun 08, 2004 3:04 pm
Zip Code: 14559
Circle of Safety: Y
Location: Rochester, NY

Re: How To Eyeball Piston ring Size

Postby Matt Kirsch » Fri May 27, 2016 11:05 am

A re-ring job is not the way to go if you want to do it right. It isn't always effective at doing what you want it to do, which is restore compression and stop the smoking. Then you've wasted your time and money and have to do it all over again with a full rebuild.

Look up a show called "Gearz" on the web. The host has done multiple episodes on bringing old engines back from the dead, if you can get past his annoying demeanor. Basically you change the oil, do an ignition tuneup, rebuild the carburetor, fix the wiring, add fuel and a battery, and go.


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall H, HV, Super H, 300 & 350”

Who is online

Users browsing this forum: No registered users and 1 guest