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Post by buster on Jul 14, 2020 15:20:44 GMT
assuming these are the measurements from your bike (wheres the oily finger prints and coffee ring?) then it looks to me like 1 shim size up on ex1 and then 3 sizes up on in3&4. which is slightly annoying as it still means both cams out.
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Post by Deleted on Jul 14, 2020 20:37:37 GMT
Just got back from Triumph after ordering some parts....including that backlash tool.
I know what you mean Buster......I could of saved some money on it.....but I don't have confidence in my ability to find an item that can do that job so I bit the bullet and bought the thing. I've also got a few other little bits needed as I have to remove an oil pipe in there, luckily these were inexpensive (one O ring and four fibre gaskets).
The frustrating thing is I can't get the shims out to measure them until I get that backlash tool. So we're on hold for a few days now. waiting for the parts to arrive.
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Post by Deleted on Jul 14, 2020 20:54:58 GMT
assuming these are the measurements from your bike (wheres the oily finger prints and coffee ring?) then it looks to me like 1 shim size up on ex1 and then 3 sizes up on in3&4. which is slightly annoying as it still means both cams out. Yes. those are the measurements.....and I have since double checked them. Question. Would you bother giving attention to the shims that are bang on at the top end of the tolerance? Or leave those ones, i.e the ones on the inlet side that are 0.20? I've heard that it can be quite acceptable to leave them a little loose, certainly much better than having too little tolerance and burning a valve. Just curious, would you personally address those ones too this time if you were me?
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Post by bojer on Jul 14, 2020 22:37:12 GMT
As you say Fungo in this case loose is better than tight..... I would be very tempted to leave those inlets as they are and would definitely leave the exhaust clearances that are near the top tolerance too . FWIW personally I would question how much I wanted to correct the E1 clearance too , on the basis it's too big by 0.00039" (Its a Triumph !) or four tenths of a thou ?
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Post by Deleted on Jul 15, 2020 3:03:19 GMT
As you say Fungo in this case loose is better than tight..... I would be very tempted to leave those inlets as they are and would definitely leave the exhaust clearances that are near the top tolerance too . FWIW personally I would question how much I wanted to correct the E1 clearance too , on the basis it's too big by 0.00039" (Its a Triumph !) or four tenths of a thou ? This is where my sanity check needs to come in with the mathematical side, Boje .....so hear's the thing. Let's say I measure one of the shims that have come out of one of the inlet clearances that was found to be 0.26 (max tolerance 0.20mm).......and I find that (again just as an example) it (shim) measures 2.30mm thick. What size does my new shim need to be to get the clearance within spec at say a random 0.16mm ? In other terms, reducing by 0.1mm. Am I right in thinking I need a shim that would need to be 2.40mm ? Remembering the Triumph shim sizes range from 2.00 to 3.20mm rising in increments of 0.025mm, what would be the ideal shim size? Is it correct to say 0.025mm x 4 would equal the 0.1mm reduction needed? I know this should not be difficult and I think when the shims are out it will all click into place......maybe I am over complicating it at this juncture....
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Post by buster on Jul 15, 2020 5:58:05 GMT
assuming these are the measurements from your bike (wheres the oily finger prints and coffee ring?) then it looks to me like 1 shim size up on ex1 and then 3 sizes up on in3&4. which is slightly annoying as it still means both cams out. Yes. those are the measurements.....and I have since double checked them. Question. Would you bother giving attention to the shims that are bang on at the top end of the tolerance? Or leave those ones, i.e the ones on the inlet side that are 0.20? I've heard that it can be quite acceptable to leave them a little loose, certainly much better than having too little tolerance and burning a valve. Just curious, would you personally address those ones too this time if you were me? I understand about the tools (I needed a clutch centre nut tool but didnt have a spare socket to sacrifice, so I bought a proper one). the shims at the top end of the clearance I'd leave alone, as you say better to leave a safe clearance rather than go too tight, also the clearance will tighten as wear/usage occurs ie they will get smaller unlike good old screw and lock nut that tend to open up. the easiest way to do the shim calculations is with a box of shims in front of you, if you take your drawing and the shims you want to change to the bike shop, they should double check them for you. it will all become clear with a box of shims in front of you
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Post by bojer on Jul 15, 2020 8:09:50 GMT
I think you've got it Fungo , as to what gap to aim for I would just go for the middle of the tolerance but could understand people going for either end too - max to ensure they're not going to be too tight or burn or min on the basis it'll make for a nice quiet motor with maximum valve lift .
It's a bit frustrating without a box of shims in front of you not knowing what you want/need .
At least you'll know it's all done and there is nothing nasty going on in the top end
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Post by marktrower on Jul 15, 2020 13:26:30 GMT
If you're doing 1k a month I would do the value clearance 1k a year or less leave as is but me I would do it knowing it wants doing .
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Post by Deleted on Jul 15, 2020 22:22:39 GMT
At least you'll know it's all done and there is nothing nasty going on in the top end Very true.... It's the bottom end I am worried about when I drop that obligatory bolt down into it.
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Post by Deleted on Jul 22, 2020 17:25:36 GMT
All prepped...time to crack on now. Let's get these shims out. Stop procrastinating on ebay etc etc....
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Post by Deleted on Jul 30, 2020 16:16:48 GMT
Forgot to update this thread (sorry) but by means of concluding it, the shims required were ordered last week, arrived Monday morning and I completed the job by Monday afternoon. All's well that ends well. Thanks for your input guys, great help.
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