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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Valve Lifter
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<blockquote data-quote="timetraveller" data-source="post: 17132" data-attributes="member: 456"><p>Hello Ian. Welcome to the wonderful world of Vincents. You should buy or borrow a book by Paul Richardson on Vincents and get a copy of the 'Spare Parts List' and look at drawing MO64. You will need to remove the banjo bolt at the front of the timing cover which interfaces with the oil filter housing, the 'big end quill' which is the hexagon headed brass item in line with the main shaft and the dome headed nut on top of the timing cover which allows you access to the screw behind it. You will then have to undo all the screws and remove the timing cover. If it has been fitted with a setting gasket cement then it might need an oblique blow with a rubber mallet to break the seal but there are two dowels behind the cover so go carefully. You can then see inside and might be able to see what has gone wrong. If it is not something that can be rectified without further dismantling then you will have to start to remove the insides. My advice would be to remove the push rods before starting to dismantle and try to ensure that the engine does not rotate otherwise you will have to re-time the valves and ignition. A dab of paint or marker pen on the pinions before you start to dismantle will help you to put things back where they were if you get a slight rotation of the pinions. It could just be that a small roller in the top of the lever which lifts the valve follower has fallen out and if so you should first of all make sure that you find it and remove it and then get someone to weld up the groove which contained this roller with a hard filler such as Stellite. There are Club members near to you who are very experienced and might be able to help. Good luck.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 17132, member: 456"] Hello Ian. Welcome to the wonderful world of Vincents. You should buy or borrow a book by Paul Richardson on Vincents and get a copy of the 'Spare Parts List' and look at drawing MO64. You will need to remove the banjo bolt at the front of the timing cover which interfaces with the oil filter housing, the 'big end quill' which is the hexagon headed brass item in line with the main shaft and the dome headed nut on top of the timing cover which allows you access to the screw behind it. You will then have to undo all the screws and remove the timing cover. If it has been fitted with a setting gasket cement then it might need an oblique blow with a rubber mallet to break the seal but there are two dowels behind the cover so go carefully. You can then see inside and might be able to see what has gone wrong. If it is not something that can be rectified without further dismantling then you will have to start to remove the insides. My advice would be to remove the push rods before starting to dismantle and try to ensure that the engine does not rotate otherwise you will have to re-time the valves and ignition. A dab of paint or marker pen on the pinions before you start to dismantle will help you to put things back where they were if you get a slight rotation of the pinions. It could just be that a small roller in the top of the lever which lifts the valve follower has fallen out and if so you should first of all make sure that you find it and remove it and then get someone to weld up the groove which contained this roller with a hard filler such as Stellite. There are Club members near to you who are very experienced and might be able to help. Good luck. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Valve Lifter
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