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Allis Chalmers Discussion Forum


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10-26-2011 13:41:19

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My neighbor has a Allis B engine hes rebuilding for a customer and needs valve guides, All the ones he has found are different then the ones he took out of the head. The one he took out has a shoulder and the ones he has found dont. Anyone have any ideas on why the guides are like this? Thanks in advance

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10-27-2011 05:02:50

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 Re: AC B in reply to BSpauld, 10-26-2011 13:41:19  
No picture, I seen the guides ,he had one out but they all were the same. I will tell him the ones he can get are the right ones, thanks for clearing it up for me. Bob

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Dick L

10-29-2011 08:47:32

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 Re: AC B Valve Guide Pictures in reply to BSpauld, 10-27-2011 05:02:50  
I checked and have three sets on the shelf. One set has no markings on the outside to show the depth. The other two do have the outside marks. The marks are .700 down from the top.

third party imageThe top has rings on the inside. Those rings limit the amount of oil for proper lubrication of the valve stem. Not placing the rings to the top on the unmarked valve guides will cause over lubrication and cause the engine to smoke.

third party image

third party image

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Dick L

10-27-2011 03:38:16

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 Re: AC B in reply to BSpauld, 10-26-2011 13:41:19  
I have not seen the valve guides with the top shoulder new in years. Most new valve guides have a line around the outside to show how deep to press them in. I have bought new guides that did not have the depth line. You can press one in to the depth of the old one checking the inside then measure the top and put them all the same. The shoulder is not needed to hold them in.

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10-26-2011 18:18:37

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 Re: AC B in reply to BSpauld, 10-26-2011 13:41:19  
most guides push into a given depth.. dont real need a lip on them.

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Bob Huntress

10-26-2011 14:46:20

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 Re: AC B in reply to BSpauld, 10-26-2011 13:41:19  
Is it an intake or exhaust? Do you have a pic of both the old and new one?

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Dick L

10-27-2011 05:17:00

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 Re: AC B in reply to Bob Huntress, 10-26-2011 14:46:20  
The intake and exhaust are both the same for the B, C and CA heads.I keep two or more sets of new guides on my head parts shelf for those engines.I looked thru my head pictures and do not have any of the guides. I will get some soon.

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Bob Huntress

10-26-2011 14:49:37

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 Re: AC B in reply to Bob Huntress, 10-26-2011 14:46:20  
Since 1939, exhaust valves have changed, and they are different in several ways today. If you have an aftermarket valve, it is probably also thicker from the guide surface to the angle cut.

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