Murphy roller rocker heads up
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Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=205133
Printed Date: 04 Nov 2025 at 2:47am
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Topic: Murphy roller rocker heads up
Posted By: NEVER green
Subject: Murphy roller rocker heads up
Date Posted: 27 Jan 2025 at 3:23pm
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Any of you running the higher ratio Murphy roller rockers for a 426, 301 this is a heads up. The instructions that you get have you check all kinds of clearances but makes no mention of the rollers centering on the valve stems so I assumed the higher ratio was achieved on the shorter pushrod side. Nope. Been running them a couple years and I just happened to notice the rollers were hanging halve off the stems, its hard to see with the engine installed, thats when I installed them. Pulled them out and compared to stock, shorter on the short side but also longer on the long side so they hang long, grrr. Should mention that in instructions, I had to elongate holes in the hold down stands, quite a pain. Two long days later they look good. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Replies:
Posted By: DrAllis
Date Posted: 27 Jan 2025 at 5:19pm
| Soo, they should be providing new "offset" rocker arm shaft stands ?? |
Posted By: NEVER green
Date Posted: 28 Jan 2025 at 8:07am
Damn straight , maybe thats why they dont mention it in the instructions??? They are already spendy. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
DrAllis wrote:Posted By: injpumpEd
Date Posted: 28 Jan 2025 at 9:53am
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I never noticed that problem with my set, I've had them for at least 10 years now, and used them on a couple of different heads. I wonder if they changed something? The Murphy 426 are different than Murphy 301 even though stock rockers are the same. They offset some of the 301 rockers. And yes, they do move the pushrod much closer to the fulcrum, usually have to grind away some on the head for clearance when valve is full open. ------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Posted By: NEVER green
Date Posted: 28 Jan 2025 at 10:37am
Bought mine in 2014, did not use them for quite some time, first tractor I tried on bent all the pushrods, stock springs, now I know why. Are yours longer on the valve side? If so they cant be correct, I had to use a mirror to spot it. I noticed after I moved the stands back the pushrods are nice and straight. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: injpumpEd
Date Posted: 28 Jan 2025 at 11:06am
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I texted you a pic Tom. I also have smith bros custom make me 301 and 426 pushrods in the stock od, just thicker wall. A lot of builders put in 7/16" PR and they really require a lot of grinding the head to clear. ------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Posted By: NEVER green
Date Posted: 28 Jan 2025 at 11:21am
Cant tell from your photo but mine looked fine until I really scrutinized them. It is tough when the engine is mounted, big gourd gets in the way. Mine were hanging over so bad you could see the valves were never rotating. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: injpumpEd
Date Posted: 28 Jan 2025 at 1:31pm
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I'll probably have my valve cover off this spring to check the lash, so I'll take a very close look, and more pics lmao! I'd think it'd be eating guides if it was that far off. Thanks for the heads up. ------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |