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AC B

B

Bspauld

Member
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
 
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.
 
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.
 
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
 
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.
Some Pix
 
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.

https://images54.fotki.com/v77/photos/3/34676/1354945/005-vi.jpg"<

The 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.

<img src="http://images58.fotki.com/v279/photos/3/34676/1354945/006-vi.jpg

007-vi.jpg
 
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