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Allis Chalmers Discussion Forum

Oil Holes G-262 Rocker Shaft

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todd hertel

01-11-2016 16:17:29

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The D-19 service manual for the G262 gas says that the oil holes in the valve rocker shaft should face towards the head. The B series Buda service manual has an illustration showing these holes facing up. My engine has them facing up. The two manuals don't seem to agree. What is the best practice?


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01-15-2016 09:19:33

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 Re: Oil Holes G-262 Rocker Shaft in reply to todd hertel, 01-11-2016 16:17:29  
I hope not too big (GPM) of pump. I'd be concerned about the increased load on the timing gears and camshaft. We had enough trouble over the years breaking off the camshaft nose on 301 engines and the G-262 would be weaker than a 301, in my opinion.

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todd hertel

01-15-2016 19:15:09

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 Re: Oil Holes G-262 Rocker Shaft in reply to DrAllis, 01-15-2016 09:19:33  
Not looking at anything big. Just trying to match about what they had. So looking at 6 to 8 gpm and then setting the pressure around 1200-1500 psi. Torque load on governor drive should about match original.

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Todd Hertel

01-14-2016 17:08:09

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 Re: Oil Holes G-262 Rocker Shaft in reply to todd hertel, 01-11-2016 16:17:29  
Your thoughts seems reasonable to me. I also have E-4's powered by the G262. They seem like a solid engine.
It's kind of interesting to see what different tech manuals call out for specs. Another thing I noticed was that BUDA calls out for a pretty hefty torque on 3/8" rod bolts.
Working on a project to make an adapter to drive a modern SAE A type pump off the governor drive. The old cockshutt pumps are pretty well worn out and beyond rebuild in my book.


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neil grant

01-15-2016 09:09:04

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 Re: Oil Holes G-262 Rocker Shaft in reply to Todd Hertel, 01-14-2016 17:08:09  
Todd, that adapter would be interesting for sure as it would cover the 30's too and there are more of them then all the other cockshutt's combined.
Let me know when you have something. Have a good weekend.

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neil grant

01-14-2016 12:07:57

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 Re: Oil Holes G-262 Rocker Shaft in reply to todd hertel, 01-11-2016 16:17:29  
Just a thought. The oil holes would be best pointing to the loaded side of the rocker arms I think to insure a oil film on the wearing surface which would be the bottom or towards the head like the newer info from the D19 indicates. I put a G262 gleaner engine in my Cockshutt 50. there were a lot of improvements over the B273 engine I thought. Neil

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01-11-2016 19:06:05

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 Re: Oil Holes G-262 Rocker Shaft in reply to todd hertel, 01-11-2016 16:17:29  
Unless you see some reason to change it, why not leave it the way it's been for the last 50 years?? My official A-C service manual says nothing in the D-17 diesel or D-19 gas or diesel book. It doesn't really say.

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