Pulling Forum - 220 Rosa Master

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220 Rosa Master

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=211575
Printed Date: 16 Sep 2026 at 1:04pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 220 Rosa Master

Posted By: NEVER green
Subject: 220 Rosa Master
Date Posted: 03 Jul 2026 at 9:37pm

Is the Rosa Master on a 220 a four or a two roller??

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2-8050 1-7080 6080 D-19 modelE & A 7040 R50

Replies:

Posted By: DrAllis
Date Posted: 04 Jul 2026 at 4:11am

"DC" is a 4-roller .310" diameter pump.

Posted By: NEVER green
Date Posted: 04 Jul 2026 at 8:20am

Thanks Dr, that should work on a 200, the same firing order?

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2-8050 1-7080 6080 D-19 modelE & A 7040 R50

Posted By: DrAllis
Date Posted: 04 Jul 2026 at 8:50am

Should be fine and overfueled. Drive shaft end is splined, so you have to find a DC shaft the right length. There are two shaft length possibilities.

Posted By: steve fischer
Date Posted: 28 Jul 2026 at 11:30am

have some dc629 if needed , 631 are hard to find,5o7 7six6 o551

Posted By: tbran
Date Posted: 30 Jul 2026 at 8:36am

You will have to talk to a pump station - the drive shaft for the 426 is too long as there is a spacer there. I would suggest asking Ed as he would have the #. I got one thru the old Columbus diesel many decades ago after discovery of the drive issue. Ed Elgin and Nobel Harrison set up a many 'floating head roosas' in the late 60-early 70's. They had a special cam ring - some used a .35" head - removed the transfer pump and delivery valve - and ran a Barnes fuel supply pump at 150 psi . The front thrust button was removed and a bolt was installed via welded nut to serve as a thrust stop for the gear. they also had the leaf springs and shoes modified to give max piston travel w/o getting the short piston cross ways seized. They also had half ,I think, of the gov weights removed. These ran successfully and won a few classes at NFMS. Of course they were no match for the inline A & P pumps that followed. Imagine, .31 plungers pumping for 6 cylinders vs one .7 " + plunger per cylinder today - quite an increase eh?

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When told "it's not the money,it's the principle", remember, it's always the money..