Author Topic: A10 new restoration, Engine  (Read 5348 times)

Online Greybeard

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Re: A10 new restoration, Engine
« Reply #90 on: 01.07. 2016 10:14 »
If it turns out that you need to split the cases you have the opportunity to clean the crankshaft sludge trap, check the timing side bush and drive side bearing and seal. You will feel a lot happier riding the bike knowing what the bottom end is like. You really need to know that the engine isn't going to self destruct because you didn't check these things.
As a bonus you get to fit the rocker box again!!  *good3*

Offline polly

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Re: A10 new restoration, Engine
« Reply #91 on: 01.07. 2016 10:18 »
Yes the dreaded rocker box.

Taking the bottom end apart prob. has some challenging jobs too.

Offline polly

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Re: A10 new restoration, Engine
« Reply #92 on: 01.07. 2016 17:10 »
Maybe good news or just more bad .

I was polishing the bike today and noticed that the dynamo was loose.

After taking the cover off I found the chain off ,so I took the time to see if there was any end float on the crank and found almost nothing....
The nut on the dynamo was loose and the tab/locking washer was broken up and sitting at the bottom [pieces looking just like the ones I found on the sump magnet]
Could some of it found its way into the crank case ?I dont know how the timing chest drains.

Offline polly

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Re: A10 new restoration, Engine
« Reply #93 on: 01.07. 2016 17:45 »
It seems to be just congealed grease all over the place in that area.

Online RichardL

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Re: A10 new restoration, Engine
« Reply #94 on: 01.07. 2016 17:49 »
There should be no way into the crankcase from the dynamo chamber. On the other hand, no play in the crank MIGHT mean you could ride for a bit (I'm assuming no responsibility here). Were you just eyeballing the movement or did you use Muskrat's method with a dial indicator?

Richard L.
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Offline polly

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Re: A10 new restoration, Engine
« Reply #95 on: 01.07. 2016 17:54 »
just eye ball

Offline polly

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Re: A10 new restoration, Engine
« Reply #96 on: 01.07. 2016 18:02 »
I got a chain and a few new tab washers and gaskets coming from priory magnetos that should be here Monday.

The bike just seems to run so good [a little noisy on the tappets ]  but I guess it would till something goes pop
 

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Offline KiwiGF

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Re: A10 new restoration, Engine
« Reply #98 on: 01.07. 2016 20:29 »
In my experience end float of the crank can be felt rather than eyeballed, even 002" end float will make a definite clunk when you push/pull the crank. You can just about see the movement of a few thou as well.

It's Obviously more accurate to measure it though, but if any shims have fallen apart the extra sideways movement should be obvious. I've not had to make a decision on what excessive end float would be enough to make me strip an engine for that issue alone....maybe 005" *dunno*

Up and down movement of the crank I reckon is a really a measure job as the clearance is less and the weight of the crank etc makes it difficult to detect movement by feel, if you can feel it then I reckon it's almost certainly strip down time, but obviously it's worth measuring it before making that decision.
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Offline bikerboy

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Re: A10 new restoration, Engine
« Reply #99 on: 02.07. 2016 02:49 »
There is no way for the washer from the dynamo to make its way into the crankcase whilst in a running state. The chain area is sealed and btw it should contain grease.

BTW trust you to have a show the weekend I am away :(

Offline East_Coast_BSA

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Re: A10 new restoration, Engine
« Reply #100 on: 02.07. 2016 06:59 »
When my bearing decided to spin and digest my shims, I pulled the primary cover off and gave the crank a good pull with my hand.  It moved and made a very distinct "clunk", it was easy to feel.  When I put on a dial indicator, it was about .015".  I would have guessed at least .050 by the sound of the clunk.

Offline polly

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Re: A10 new restoration, Engine
« Reply #101 on: 02.07. 2016 14:06 »
After cleaning everything up I found that the chain had cut its way into the case so I got a used belt drive off a friend this morning and fitted it . The gears fought me to get off but got there in the end.
So now watching f1 qualifying while polishing the outer cover then button it back up again. Her indoors getting ***** off with bike parts on her carpets .

 
Hopefully thats one less thing to worry about .

Offline polly

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Re: A10 new restoration, Engine
« Reply #102 on: 02.07. 2016 16:32 »
Back together and charging great.

Cant wait any longer I must take her for a blast ...

Online muskrat

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Re: A10 new restoration, Engine
« Reply #103 on: 02.07. 2016 21:43 »
That dynamo belt looks way too tight. You should be able to twist the belt 90 degrees easily with your fingers. This may seem very loose but it tightens considerably as the motor gets hot.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
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Offline polly

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Re: A10 new restoration, Engine
« Reply #104 on: 04.07. 2016 16:05 »
ok .....the bikes done ....every thing and every scrap of advice taken.


Thank you all   ..it runs like a scolded cat ..starts first kick ..and

ready to take to the show ...


https://youtu.be/LlPt0dqtJ_I