Author Topic: Crankshaft side play/shims etc  (Read 3950 times)

Online muskrat

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Re: Crankshaft side play/shims etc
« Reply #15 on: 09.11. 2015 08:42 »
G'day Fred.
Yes. way too much. 0.05mm is recommended, 0.10mm is maximum.
BSA500, it's going to be a bugga of a job doing it that way. Your only going to save a few hours and a couple of gaskets. And later were going to say "I told you so". Do it the right way.
My guess is either the timing side bush wasn't all the way home or the cases were misaligned and the crank wasn't free to give a proper reading the first time.
I really do wish you luck with it.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online bsa-bill

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Re: Crankshaft side play/shims etc
« Reply #16 on: 09.11. 2015 09:06 »
Quote
or the cases were misaligned

Yes, I never use joint compound on the case halves, pointless measuring down to 0.003 " then smearing a thickness of goo into the eqation, you could put the goo in first of course but I've never had a problem withe two case halves leaking, the taper seems to do it just fine
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline BSA500

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Re: Crankshaft side play/shims etc
« Reply #17 on: 09.11. 2015 09:39 »
Mine appears to move more than that video. Prob will have a mare doing the engine this way but I just cannot bear stripping each and every bit off esp as the head joint was an absolute b*****d last time and its still a raw and recent memory  :!.
Perhaps the drive side bearing misaligned or timing bush or ???. We shall see. I will continue to remove the lump tonight while the family watches the soaps.

Offline BSA500

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Re: Crankshaft side play/shims etc
« Reply #18 on: 10.11. 2015 13:14 »
Well a little farther down the strip down road. Had to abandon leaving the clutch on as a nut on one of the engine mounting bolts was being a bitch so the inner primary case needed to be out of the way. Found the clutch centre was starting to work loose ie not very tight and the sprocket nut was loose as well so not a wasted effort taking the clutch off  *smile*

Offline FoxDK

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Re: Crankshaft side play/shims etc
« Reply #19 on: 10.11. 2015 16:49 »
G'day Fred.
Yes. way too much. 0.05mm is recommended, 0.10mm is maximum.

Thank. I did expect that, it must be a winter-projekt to get rid of this end-float/play  *smile*

Offline jachenbach

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Re: Crankshaft side play/shims etc
« Reply #20 on: 10.11. 2015 18:34 »
I'm glad this thread showed up at this time. I've been putting off reshimming one of my engines that I put together a few months back. It has .021" (.53mm) endplay. When I took it apart, it had no shims. When I put it together I used Yamabond 4 on the case halves. I think I'll try again without sealant before I add shims. Not a big deal, as I checked endplay as soon as I torqued down the case bolts, so not a lot to take back apart, I just have to do it (instead of a dozen other things I've been working on).

Offline BSA500

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Re: Crankshaft side play/shims etc
« Reply #21 on: 10.11. 2015 22:12 »
Getting closer the engine is now out-yes it is heavy with the head etc still on it  *eek*

Online coater87

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Re: Crankshaft side play/shims etc
« Reply #22 on: 13.11. 2015 14:29 »
I'm glad this thread showed up at this time. I've been putting off reshimming one of my engines that I put together a few months back. It has .021" (.53mm) endplay. When I took it apart, it had no shims. When I put it together I used Yamabond 4 on the case halves. I think I'll try again without sealant before I add shims. Not a big deal, as I checked endplay as soon as I torqued down the case bolts, so not a lot to take back apart, I just have to do it (instead of a dozen other things I've been working on).

 I can see threebond adding a little, but not much at all. Maybe .001 to .0015 but I really cant see more than that. Generally unless I am trying to seal a known bad area on something (bent cover mating area, or a screw driver gouge) I basically smear just enough on to make it glossy (very, very thin) and even that squeezes out.

 It would really be interesting to read endplay dry, and then again with the threebond.
Central Wisconsin in the U.S.

Online bsa-bill

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Re: Crankshaft side play/shims etc
« Reply #23 on: 13.11. 2015 18:11 »
Quote
It would really be interesting to read end play dry, and then again with the threebond.

It would  even if 0.001 was the result that is one third of the max 0.003 gone
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online coater87

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Re: Crankshaft side play/shims etc
« Reply #24 on: 14.11. 2015 02:56 »
 I guess I didn't think about it that way Bill, I was just thinking how small an amount .001 is....
Central Wisconsin in the U.S.

Offline BSA500

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Re: Crankshaft side play/shims etc
« Reply #25 on: 14.11. 2015 12:43 »
Well here are some pics of the strip down. Decided on a full strip as the head gasket showed signs of leaking and some oil burning(oil from the top as no blow by stains on the piston skirts). As predicted the shim was intact so I prob cocked up or the bearing was not fully home etc.....







So dig out my spare shims and see if I have the correct amount and put right a few loose bits and bobs

Offline BSA500

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Re: Crankshaft side play/shims etc
« Reply #26 on: 17.11. 2015 08:59 »
I forgot to add the inner bearing race is finger tight ie easy to slip on and off, always has been so I will be locking that with a punch-joking bearing retainer loctite etc  ;)

Offline RichardL

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Re: Crankshaft side play/shims etc
« Reply #27 on: 17.11. 2015 12:03 »
Not related to the issue of too much play, but I'm curious how thick that one shim is. Looks thicker than the 0.010" that comes with sets I've had. Did you machine it yourself?

Richard L.
Plan on signing up for the world-wide 2017 DISTINGUISHED GENTLEMAN'S RIDE on September 30, 2018. Watch website at https://www.gentlemansride.com for details.

Offline BSA500

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Re: Crankshaft side play/shims etc
« Reply #28 on: 17.11. 2015 12:24 »
Nah its just an optical illusion as it measures 11 thou. I have gathered up my spare shims and have a 32 thou pack to use. I will be using bearing retainer for the inner race to,hopefully, make this a less regular event.

Offline RichardL

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Re: Crankshaft side play/shims etc
« Reply #29 on: 17.11. 2015 12:35 »
I'm not sure if it really helps, but in two of the three times I've done it, I've kept the really thin shims sandwiched between the thicker ones.

Richard L.
Plan on signing up for the world-wide 2017 DISTINGUISHED GENTLEMAN'S RIDE on September 30, 2018. Watch website at https://www.gentlemansride.com for details.