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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
push rod tube seals........
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<blockquote data-quote="greg brillus" data-source="post: 73215" data-attributes="member: 597"><p>I use "O' rings on most all engines now, I find the original type too inconsistent be it the diameter of the case housing or the tubes which need to be 3/4" diameter if they are good ones, many are smaller than this or not round, and this will promote leaks, also the material can vary from soft to hard. An o ring with a 3 mm cross section works well, I have never had any issues with them coming out, after I tighten the tube nut I massage the o ring down to the base of the groove. I generally smear a very small amount of sealant around the very bottom of each pushrod tube immediately before installation, firstly it helps lubricate and provide a nice sliding fit as the pushrod tube changes angle as it enters the mouth of the crankcase, and it gives a little more sealing ability. I generally use two of the ET 123 One atop and one under the flange of the tube and do not over tighten these, a small amount of sealant smeared on the top tube flange before assembly will help. Neal's seals work ok but are very difficult to remove, as the rubber part deforms with the head temperature and bonds itself into the tube housing, I prefer the original type. Using an o ring on the lower seals tend to sit lower in the housing, so I use a smaller section o ring above it and this visually looks better. I figured if an O ring could handle the case pressures of a race engine, then it should work fine on a road engine, so far this has been the case.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 73215, member: 597"] I use "O' rings on most all engines now, I find the original type too inconsistent be it the diameter of the case housing or the tubes which need to be 3/4" diameter if they are good ones, many are smaller than this or not round, and this will promote leaks, also the material can vary from soft to hard. An o ring with a 3 mm cross section works well, I have never had any issues with them coming out, after I tighten the tube nut I massage the o ring down to the base of the groove. I generally smear a very small amount of sealant around the very bottom of each pushrod tube immediately before installation, firstly it helps lubricate and provide a nice sliding fit as the pushrod tube changes angle as it enters the mouth of the crankcase, and it gives a little more sealing ability. I generally use two of the ET 123 One atop and one under the flange of the tube and do not over tighten these, a small amount of sealant smeared on the top tube flange before assembly will help. Neal's seals work ok but are very difficult to remove, as the rubber part deforms with the head temperature and bonds itself into the tube housing, I prefer the original type. Using an o ring on the lower seals tend to sit lower in the housing, so I use a smaller section o ring above it and this visually looks better. I figured if an O ring could handle the case pressures of a race engine, then it should work fine on a road engine, so far this has been the case. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
push rod tube seals........
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