Author Topic: Post big bang - Whitsend A10  (Read 5107 times)

Offline charles whitfield

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Re: Post big bang - Whitsend A10
« Reply #15 on: 16.05. 2014 00:26 »
Hmmm, but if I kept going right on my Peninsula journey - I would have arrived home  *conf*

!! avoid all left hand journeys

Online KiwiGF

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Re: Post big bang - Whitsend A10
« Reply #16 on: 16.05. 2014 02:52 »
A big end failure after so few miles is concerning.  Does the other big end show signs of wear?

Oil supply failure to the big ends sounds a likely root cause. Is the srm feed arrangement in good condition?

Is the top end work needed unrelated?

New Zealand

1956 A10 Golden Flash  (1st finished project)
1949 B31 rigid “400cc”  (2nd finished project)
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Offline charles whitfield

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Re: Post big bang - Whitsend A10
« Reply #17 on: 16.05. 2014 08:01 »
Hi KiwiGF
I tend to agree - As far as I can see the oil system is in A1 condition, but I have not yet taken the oil pump apart - it feels fine though when I turn it. Hence my suspicion about the end plug leaking and loosing pressure
The drive side big end is showing slight signs  - it could just be the result of debris from t'other though - I will post some pictures later, but now need to go to work to earn the repair tokens
The top end work is needed since the broken con rod a) caused a cracked barrel skirt and b) rammed the piston into the head
As the valves tried to open against the piston crown, it dramatically bent the push rods, I have yet to see if the valves are distorted in any way - I am mentally preparing for the worst, but can't bear to look yet
But it WILL run again
   

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Re: Post big bang - Whitsend A10
« Reply #18 on: 16.05. 2014 13:08 »
Well said Charles keep on with the progress reports regards Bob.
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Re: Post big bang - Whitsend A10
« Reply #19 on: 16.05. 2014 21:55 »
I'm afraid to say the valves will be RS as well Charles.
Similar to my A65 blow up, rod little end missing. Could that have started the ball rolling. Mine was making a rattle for some time before it went bang, the big end bearings weren't too bad.
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
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Offline charles whitfield

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Re: Post big bang - Whitsend A10
« Reply #20 on: 16.05. 2014 22:05 »
I filled the head with alcohol to see if it leaked tonight
Good news - only rubbish came out
 *smiley4*   

Offline chaterlea25

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Re: Post big bang - Whitsend A10
« Reply #21 on: 16.05. 2014 22:16 »
Hi Charles,
The failure had to be due to a lack of oil pressure
You said that the bike was left idle for 5 years, ?
If left idle the oil pump bodies can grow and jam the gears !, equally the mazac can go porus and leak all the oil out *eek*
Have you checked the pressure relief valve?
I would have thought that if loose the crank plug would have been blown outwards by the oil pressure???

HTH
John
1961 Super Rocket
1963 RGS (ongoing)

Offline charles whitfield

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Re: Post big bang - Whitsend A10
« Reply #22 on: 16.05. 2014 22:46 »
Hmmmm - some interesting points there, thanks 
Yes, a lack of oil pressure is the big issue
Just been to check the oil pump and all as fine - in fact when I ran it up there was a very healthy oil return to the tank (spent ages kicking it over with the plugs out til it did so)
now for the relief valve - I will have a look and let you know
Cheers
Charles     

Offline WozzA

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Re: Post big bang - Whitsend A10
« Reply #23 on: 16.05. 2014 22:47 »
I filled the head with alcohol to see if it leaked tonight
Good news - only rubbish came out
 *smiley4*   
I have the same problem ..   *beer*
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Online orabanda

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Re: Post big bang - Whitsend A10
« Reply #24 on: 17.05. 2014 00:43 »
I was told the bike would go faster if you shaved the head; well it didn't - but my ears were colder!

Offline a10 gf

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Re: Post big bang - Whitsend A10
« Reply #25 on: 17.05. 2014 02:02 »
Quote
I am mentally preparing for the worst, but can't bear to look yet
But it WILL run again
*good3*


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Offline duTch

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Re: Post big bang - Whitsend A10
« Reply #26 on: 17.05. 2014 09:14 »

 
Quote
I filled the head with alcohol to see if it leaked tonight
Good news - only rubbish came out
 *smiley4*   

 Yea got the jump on me there Wozza- I wozza thunkin' the same thang....!!! *beer*
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Re: Post big bang - Whitsend A10
« Reply #27 on: 18.05. 2014 11:36 »
Your broken bits (posted in another topic http://www.a7a10.net/forum/index.php?action=dlattach;topic=8385.0;attach=25186;image) look a lot like my A65's bits.
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
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Offline charles whitfield

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Re: Post big bang - Whitsend A10
« Reply #28 on: 18.05. 2014 20:35 »
Any-one know what this is?   

Offline RichardL

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Re: Post big bang - Whitsend A10
« Reply #29 on: 18.05. 2014 20:44 »
The freeze plug from your Chevrolet?