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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
siting of valve collar ET35 on the valve stem
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<blockquote data-quote="charles d cannon jr" data-source="post: 109292" data-attributes="member: 2591"><p>I've recently been working on my cylinder heads and had lapped and assembled the valve assemblies on the rear head, ET 35 "seated" on the valve stems with a rap using a hollow socket and hammer, then attempted to insert an assembled rocker arm/bearing assembly. I'm using the modified rocker arm that is "dished" at the top to accomodate the club modified oil feel bolt. The rocker arm would not fit above ET 35. The rocker arm had some casting richness at the top so I ground that off and smoothed it. My standard of reference is a rocker arm I pulled out of a 1948 head that was polished on top ( it wouldn't fit either). I disassembled the collets, springs etc, and was able to assemble using only the valve, ET 35 and rocker arm/bearing assembly. With the rocker arm in place on top of ET35,and full depression of the arm,which have should have allowed the valve to totally close, the valve was still open a couple of millimeters. I realized that the high position of ET35 on the valve stem was preventing proper assembly/function. The "Instruction sheets" state that "The collar ET35 should be a light drive fit on the stem just above the shoulder of the valve" My Valves have 3 separate stem dimensions, the top, which is about half of the valve length, a mid portion of about 5mm, and the lower part of the stem to where the valve flares. My new assumption is that ET35 needs to go totally down on the midportion???? If so I guess I'll chuck the valve up in the drill press and get out the emery paper again....... Any thoughts or comments are much appreciated!!</p></blockquote><p></p>
[QUOTE="charles d cannon jr, post: 109292, member: 2591"] I've recently been working on my cylinder heads and had lapped and assembled the valve assemblies on the rear head, ET 35 "seated" on the valve stems with a rap using a hollow socket and hammer, then attempted to insert an assembled rocker arm/bearing assembly. I'm using the modified rocker arm that is "dished" at the top to accomodate the club modified oil feel bolt. The rocker arm would not fit above ET 35. The rocker arm had some casting richness at the top so I ground that off and smoothed it. My standard of reference is a rocker arm I pulled out of a 1948 head that was polished on top ( it wouldn't fit either). I disassembled the collets, springs etc, and was able to assemble using only the valve, ET 35 and rocker arm/bearing assembly. With the rocker arm in place on top of ET35,and full depression of the arm,which have should have allowed the valve to totally close, the valve was still open a couple of millimeters. I realized that the high position of ET35 on the valve stem was preventing proper assembly/function. The "Instruction sheets" state that "The collar ET35 should be a light drive fit on the stem just above the shoulder of the valve" My Valves have 3 separate stem dimensions, the top, which is about half of the valve length, a mid portion of about 5mm, and the lower part of the stem to where the valve flares. My new assumption is that ET35 needs to go totally down on the midportion???? If so I guess I'll chuck the valve up in the drill press and get out the emery paper again....... Any thoughts or comments are much appreciated!! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
siting of valve collar ET35 on the valve stem
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