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Post by CTB on May 19, 2021 8:07:46 GMT
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Post by buster on May 19, 2021 11:33:08 GMT
the bucket and shim valves will (usually) close up as they wear, so not very surprising you cant get the feeler gauge in. sounds like they have been a bit neglected, I'd shim them up (I'd aim for the larger of the tolerance measurements) and see how it sounds then. fingers crossed you can get them with a pry tool and tweezers
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Post by CTB on May 19, 2021 12:12:59 GMT
the bucket and shim valves will (usually) close up as they wear, so not very surprising you cant get the feeler gauge in. sounds like they have been a bit neglected, I'd shim them up (I'd aim for the larger of the tolerance measurements) and see how it sounds then. fingers crossed you can get them with a pry tool and tweezers I have ordered the tool to compress the buckets and slide the shims out. Looks like I will need at least 13 new shims 😩. |
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Post by BritPete on May 19, 2021 12:39:54 GMT
So why are some engines Shims - Seems more sensible to standardise on Tappets
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Post by BritPete on May 19, 2021 12:42:51 GMT
Help/Advise needed. On start up I get a tapping noise for a brief time approx 2-5 seconds. So I dropped the cam cover off and took feeler gauge readings on each valve with the valve closed. To my surprise I could not get a 0.05mm (0.002”) feeler in any apart from one exhaust valve on number 3 which was 0.06 and inlet valves on number 2 which were 0.08 and 0.09. 0.08 is ideal with a minimum of 0.06 and a maximum of 0.13mm. So I assume I have a lot of shims to replace and I have No idea why I have a tapping on start up.  That will be the screwdriver the previous owner left in there That reminds me of the Film the African Queen - Why don't you remove it Mr Alnut - I should do but I kinda like kicking it when it sticks |
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Post by buster on May 19, 2021 12:47:02 GMT
the bucket and shim valves will (usually) close up as they wear, so not very surprising you cant get the feeler gauge in. sounds like they have been a bit neglected, I'd shim them up (I'd aim for the larger of the tolerance measurements) and see how it sounds then. fingers crossed you can get them with a pry tool and tweezers I have ordered the tool to compress the buckets and slide the shims out. Looks like I will need at least 13 new shims 😩. it can often work out that the shim you take out then fits another valve, this makes them a bit of a pain, dead easy to swap with the right tool but expensive to buy a selection box of shims (about £100 for my kwack) |
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Post by BritPete on May 19, 2021 16:20:47 GMT
That is one smart 750 CTB  |
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Post by buster on May 19, 2021 16:36:05 GMT
So why are some engines Shims - Seems more sensible to standardise on Tappets kawasaki used to change their engines almost yearly from bucket and shim to screw and locknut and then back again, often with long winded press releases giving various reasons, in reality there cant be much in it. both systems have slight advantages and disadvantages, I'd guess bucket and shim makes more sense in a race bike (if the mechanics have to adjust between race days?) and screw and locknut is easier for people like us because you dont need a big box of shims. or maybe I should stop talking cr*p and go have a beer in the sun... |
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Post by BritPete on May 19, 2021 16:46:39 GMT
So why are some engines Shims - Seems more sensible to standardise on Tappets kawasaki used to change their engines almost yearly from bucket and shim to screw and locknut and then back again, often with long winded press releases giving various reasons, in reality there cant be much in it. both systems have slight advantages and disadvantages, I'd guess bucket and shim makes more sense in a race bike (if the mechanics have to adjust between race days?) and screw and locknut is easier for people like us because you dont need a big box of shims. or maybe I should stop talking cr*p and go have a beer in the sun... Carry on talking AND have a beer |
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Post by comstar on May 19, 2021 19:42:37 GMT
I said to CTB yesterday the noise might be totally unconnected to the head, it’s surprising how the conductivity of metallic sounds can fool you.
(Recalling the classic VW advert with the squeaking earring lol).
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Post by johnfcbn44dx on May 19, 2021 19:53:20 GMT
So why are some engines Shims - Seems more sensible to standardise on Tappets Then in the 80's along came the CBX750, 700/750 Nighthawk and the 400 Superfour with hydraulic self adjusting tappets.... |
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Post by comstar on May 19, 2021 20:35:05 GMT
So why are some engines Shims - Seems more sensible to standardise on Tappets Then in the 80's along came the CBX750, 700/750 Nighthawk and the 400 Superfour with hydraulic self adjusting tappets.... My MK3 Escort also had those (1.6 CVH engine). The tappets did become rattley after a while and had to be replaced. |
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