Author Topic: Post big bang - Whitsend A10  (Read 3782 times)

Offline charles whitfield

  • A's Best Friend
  • ***
  • Join Date: May 2014
  • Posts: 59
  • Karma: 0
  • Bore Da!
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

  • Last had an A10 in 1976, in 2011 it was time for my 2nd one. It was the project from HELL (but I learned a lot....)
  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 1449
  • Karma: 12
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 hot rod” (2nd finished project, + favourite bike)

1949 C11 rigid, but why!!! (cos it was cheap)

1937 B21, project missing parts, mission impossible?

GL1800 Goldwing, well, the wife likes it

KTM 950 ADV, cos it’s 100% nuts

1952 Armstrong Siddeley Whitley for rainy days (with wife

Offline charles whitfield

  • A's Best Friend
  • ***
  • Join Date: May 2014
  • Posts: 59
  • Karma: 0
  • Bore Da!
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
   

Offline Topdad

  • bob hebdon
  • Wise & Enlightened
  • *
  • Join Date: May 2011
  • Posts: 2235
  • Karma: 32
  • l
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.
" rules are made for the guidance of wise men and the blind obediance of fools"
United Kingdom

Offline muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8237
  • Karma: 106
  • Lake Conjola NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
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 now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline charles whitfield

  • A's Best Friend
  • ***
  • Join Date: May 2014
  • Posts: 59
  • Karma: 0
  • Bore Da!
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*   

Online chaterlea25

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 3212
  • Karma: 46
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

  • A's Best Friend
  • ***
  • Join Date: May 2014
  • Posts: 59
  • Karma: 0
  • Bore Da!
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     

Online WozzA

  • Wise & Enlightened
  • *
  • Join Date: Nov 2011
  • Posts: 1298
  • Karma: 16
  • Melbourne Australia
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*
'51 Golden Flash Plunger
'57 Golden Flash Swingarm

Melbourne
The biggest lie I tell myself is
"I don't need to write that down, I'll remember it"

Offline orabanda

  • Resident Legend
  • *****
  • Join Date: Nov 2008
  • Posts: 999
  • Karma: 21
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 a10gf

  • Wise & Enlightened
  • *
  • Join Date: Sep 2006
  • Posts: 2798
  • Karma: 42
  • West Coast, Norway & Alpes Maritimes, France
    • A10 GF
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*

A10 GF '53 My A10 website
"Success only gets you a ticket to a much more difficult task"

Offline duTch

  • Ricketty Rocketty Golden Flashback
  • Wise & Enlightened
  • *
  • Join Date: Oct 2011
  • Posts: 4540
  • Karma: 41
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*
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 muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8237
  • Karma: 106
  • Lake Conjola NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
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 now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline charles whitfield

  • A's Best Friend
  • ***
  • Join Date: May 2014
  • Posts: 59
  • Karma: 0
  • Bore Da!
Re: Post big bang - Whitsend A10
« Reply #28 on: 18.05. 2014 20:35 »
Any-one know what this is?   

Offline RichardL

  • Outside Chicago, IL
  • Wise & Enlightened
  • *
  • Join Date: Nov 2007
  • Posts: 5033
  • Karma: 48
Re: Post big bang - Whitsend A10
« Reply #29 on: 18.05. 2014 20:44 »
The freeze plug from your Chevrolet?
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.