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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leaking Push Rod Tubes
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<blockquote data-quote="Matty" data-source="post: 32325" data-attributes="member: 1339"><p>My exhaust push rod tube has leaked a little oil for some years and because I have had to have a repair done to the head, I have naturally changed the bottom seals for the push rods in the expectation of curing the slight leak when I replaced the cylinder head.</p><p></p><p>I checked the push rod tube for circularity, correct diameter and damage before I replaced it and it was a tight fit in the seal.</p><p></p><p>It still leaks a little and now I have no idea why.</p><p></p><p>Presumably to do a proper fix, I will have to remove the head again - though I seem to remember an owner saying that he had managed to cut a new seal and then fit it round the tube with some sealant. I do not think however that I could get the seal into the crankcase on my bike - it is too tight a fit onto the pushrod tube.</p><p></p><p>For the moment I have put some special silicone type seal round the tube seal and then a thin layer of Araldite and this seems to have worked.</p><p></p><p>This must be an old problem - and I know for a fact that some old aluminium push rod tubes as originally fitted to my bike (I have had it since 1956) were 25thou undersized in diameter which leaked for years until I fitted stainless ones.</p><p></p><p>Has anyone got a good fix without taking the head off again or any ideas please on what the problem might be or special instructions on how the seal should be fitted ?</p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 32325, member: 1339"] My exhaust push rod tube has leaked a little oil for some years and because I have had to have a repair done to the head, I have naturally changed the bottom seals for the push rods in the expectation of curing the slight leak when I replaced the cylinder head. I checked the push rod tube for circularity, correct diameter and damage before I replaced it and it was a tight fit in the seal. It still leaks a little and now I have no idea why. Presumably to do a proper fix, I will have to remove the head again - though I seem to remember an owner saying that he had managed to cut a new seal and then fit it round the tube with some sealant. I do not think however that I could get the seal into the crankcase on my bike - it is too tight a fit onto the pushrod tube. For the moment I have put some special silicone type seal round the tube seal and then a thin layer of Araldite and this seems to have worked. This must be an old problem - and I know for a fact that some old aluminium push rod tubes as originally fitted to my bike (I have had it since 1956) were 25thou undersized in diameter which leaked for years until I fitted stainless ones. Has anyone got a good fix without taking the head off again or any ideas please on what the problem might be or special instructions on how the seal should be fitted ? Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leaking Push Rod Tubes
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