Author Topic: Crankshaft shimming  (Read 1795 times)

Online Greybeard

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Re: Crankshaft shimming
« Reply #15 on: 25.05. 2018 12:56 »
Yes, eliminates the possibility of the inner race moving on the shaft. I know if it's tight on the shaft it shouldn't but!
Just to be on the safe side I like to have it as though the motor is running.
Cheers
Ah, OK, I get it!

Offline BSA500

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Re: Crankshaft shimming
« Reply #16 on: 25.05. 2018 12:59 »
So do I now  *smile*

Offline BSA500

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Re: Crankshaft shimming
« Reply #17 on: 29.05. 2018 12:45 »
So did more stripping down. Endfloat is 5 thou not massive but enough for me. Biggest issue and source of noise/vibration is the really floppy timing side big end. When I rebuilt it there was some play but I was impatient to get riding. Big mistake it seems

Offline BSA500

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Re: Crankshaft shimming
« Reply #18 on: 31.05. 2018 13:31 »
OK anyone who has seen the video sort of pulls a face similar to 'how didn't that go bang'. I have contacted a engineer who is going to check then most probably grind the journals(with the correct radius everyone). If we are talking about price £27.50 per side.
 I can then reshim rocker arm play and clean up bits ready. Also clean and check the anti syphon valve ball etc.

Offline BSA500

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Re: Crankshaft shimming
« Reply #19 on: 05.06. 2018 13:07 »
The engineer now has the crank for a grind and it looks like I have to make the grub screw for the anti syphon valve(67-1401) as nobody stocks them. In the wet sumping thread you will see I had left this part out and had been wet sumping for some strange reason *problem*

Online Greybeard

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Re: Crankshaft shimming
« Reply #20 on: 05.06. 2018 13:28 »
...looks like I have to make the grub screw for the anti syphon valve(67-1401) as nobody stocks them. In the wet sumping thread you will see I had left this part out and had been wet sumping for some strange reason *problem*
It's the same Whitworth thread as the cylinder block studs.

Offline BSA500

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Re: Crankshaft shimming
« Reply #21 on: 05.06. 2018 13:50 »
Yep but I had better use a bolt as I would have to but one of those as well *grins* *grins*

Online orabanda

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Re: Crankshaft shimming
« Reply #22 on: 05.06. 2018 14:05 »
I modify the retaining screw for the anti-sumping ball valve. From memory, the thread is 3/8 BSW.

To slightly increase the  spring loading on the ball I make the screw a little bit longer; think it was about 0.080". I also machine a little recess in the centre (create a shoulder) which the spring locates in centralises it under the ball).

Richard

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Re: Crankshaft shimming
« Reply #23 on: 05.06. 2018 15:14 »
Hay GB, you been using the Delorean again. The quote in your last post says 1974!!!!!
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Muskys Plunger A7

Online Greybeard

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Re: Crankshaft shimming
« Reply #24 on: 05.06. 2018 20:25 »
Hay GB, you been using the Delorean again. The quote in your last post says 1974!!!!!
Cheers
I guess I cocked up!

Offline duTch

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Re: Crankshaft shimming
« Reply #25 on: 05.06. 2018 23:29 »
 
Quote
Hay GB, you been using the Delorean again. The quote in your last post says 1974!!!!!  Cheers   

 Saw that and thought my eyes had totally cocked out.. *eek*. Remember,remember the 4th (or 5th) of November......

 
Quote
Quote from: BSA500 on November 05, 1974, 04:00:44

    ...looks like I have to make the grub screw for the anti syphon valve(67-1401) as nobody stocks them. In the wet sumping thread you will see I had left this part out and had been wet sumping for some strange reason *problem*

It's the same Whitworth thread as the cylinder block studs.

 I bought a spare plug & A65 spring from SRM, but was a couple of years ago....measured it at 16 T.P.I (3/8 ww), x 0.1735 long which is a nothing measurement between 11/64" & 3/16"

 **...sorry 'Off Topic'.... I've had an issue with my now 4yr old Macbook  where it saves files/pics on the 12/12 of whichever year I'm in- been onto Apple and spent a few hours on the phone doing 'screen-sharing' to sort it but no go. Is not a major issue until I had to prove I tried to pay my rego one day and couldn't get a connection-several times ..... *conf*
 Normal Programming will now resume......

 Pics;
 
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline BSA500

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Re: Crankshaft shimming
« Reply #26 on: 09.06. 2018 18:19 »
Crank grind done. One journal was 3 thou under the other. Could explain a lot

Offline BSA500

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Re: Crankshaft shimming
« Reply #27 on: 13.06. 2018 12:56 »
Why is it whenever I need big end shells that size has become the rarest of the rare size. I need -30 I know Draganfly have them but they would at £72 plus post. Also SRM do but again £54 plus post. *sad2*

Online RichardL

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Re: Crankshaft shimming
« Reply #28 on: 13.06. 2018 13:07 »
More and more we are in the bullet-biting business when it comes to paying for the parts we need. Oddly, or unfortunately, or naturally, the prices go up because of our own friends and members here. I have pondered the question as to if parts scarcity is, in part, due to the forum making it much easier and welcoming to restore our marques. We HAVE grown a bit since 2006.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Offline BSA500

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Re: Crankshaft shimming
« Reply #29 on: 13.06. 2018 13:22 »
I know what you mean,but the prices for these are quite reasonable from other trusted suppliers at around £30 but no stock. I had exactly the same problem years ago when I needed -20. Alot of the new shells are unbranded as well so some risk there.