Another piston ring question
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=28671
Printed Date: 02 Mar 2025 at 2:13pm
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Topic: Another piston ring question
Posted By: captaindana
Subject: Another piston ring question
Date Posted: 06 Apr 2011 at 6:54pm
| Why, on some sites, they want you to fill in the 4 different piston ring thicknesses? Like how do you determine this? Sorry...this engine rebuilding is new to me and I find it very fascinating! Dana |
Replies:
Posted By: Chris/CT
Date Posted: 06 Apr 2011 at 6:59pm
| I don't think Hastings needs you to provide all that info, call them they will ship em' right to you, Find out from engine guy's if you should get chrome or regular, chrome rings take longer to seat from what I hear. |
Posted By: 48AC/WD
Date Posted: 06 Apr 2011 at 7:01pm
|
Because you have compression rings on the top and an oiling ring on the bottom, in the automotive industry there is only 2 top rings and 1 lower ring (3 total), a tractor has (4 total) AND because all ring lands and thicknesses differ by thousandths per manufacturer, hence why in the automovive industry you replace pistons and rings in pairs of matched sets. |
Posted By: Gary in da UP
Date Posted: 06 Apr 2011 at 7:39pm
| After you have cleaned the ring grooves , get your feeler gauges & measure so you get the proper rings. |
Posted By: captaindana
Date Posted: 07 Apr 2011 at 4:57am
| OK thanks guys. So Gary, measuring the groove for ring thickness, how tight should it be? Not knowing anything lol if I measure the groocce at 1/8 inch what ring size would you order? |
Posted By: davefullmer
Date Posted: 07 Apr 2011 at 5:31am
|
I have found over the years that if I find the oldest clerk in the parts store to help me, I can get pretty good answers to my questions like this. Some of these guys have a lot of knowledge tucked away in their heads that are really helpful. If I ever have any oddball situations or questions, the old guys seem to be able to answer them because sometime in the past, they have worked with someone else with the same problem. Sometimes the young ones just aren't willing to put in the effort to help. My parts store people are some of my best information. |
Posted By: Dick L
Date Posted: 07 Apr 2011 at 8:12am
|
Actually you will only need to fill in that you need three 1/8" compression ring and one 3/16 oil ring. You will have no other choice for that tractor using Allis pistons. They do not supply thicker rings to make up for piston groove ware. Some other makes of tractors used different thickness rings on different years for the oil rings.
Example: Some Oliver 55's used 3/16 oil rings and some used 1/4" oil rings. Even though both used the 3/32" compression rings. When making an order form you would make a standard form to cover all necessary questions for all makes.
Actually for Oliver it was that way for the 77's as well.
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Posted By: redline
Date Posted: 07 Apr 2011 at 8:25am
------------- If it weren't for the last minute, I wouldn't get anything done! |
Dick L wrote:Posted By: Dick L
Date Posted: 07 Apr 2011 at 8:33am
| If my memory serves me right I think that Messy Hairlip and Farmalittle had different oil ring thicknesses for the same diameter pistons on some models. Probly others. |
Posted By: Chris/CT
Date Posted: 07 Apr 2011 at 8:56am
| I wondered about wear in piston ring groove's. I have a set of pistons from a 230 Buda, which I suspect have worn grooves [ beyond allowable spec's]. I bought set of rings from Hasting's, but I bet they too sloppy, that said, pistons are junk? Hastings isn't about to start making rings to allow for my worn ring grooves. I do have a complete set that I believe is much better condition thankully. |
Posted By: Alberta Phil
Date Posted: 07 Apr 2011 at 10:06am
|
Hastings supplied the rings for my 20-35 and they also supplied the necessary shim rings to take up the wear in the grooves. We machined the ring grooves to clean them up square and they supplied spacer/shim rings with the standard rings to take up the wear. They supplied the same type of setup for the Crossmotor Case that I restored. |
Posted By: Brian G. NY
Date Posted: 07 Apr 2011 at 3:26pm
|
You probably won't have to get too sophisticated in your situation, but there is
some interesting stuff here.
http://www.ringspacers.com/index.htm - http://www.ringspacers.com/index.htm
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Posted By: captaindana
Date Posted: 07 Apr 2011 at 6:03pm
| Well I thank you all for this learning experience! |