Author Topic: A10 anti wet sumping ball valve modification to A65 setup photos and dimensions  (Read 520 times)

Online chaterlea25

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Hi All,
Starting a new topic on this so hopefully these modification photos can be found in future

The spring and ball are as supplied by SRM, the spring is 1in. long (25.4mm) and ball is 1/4in. diameter
The oil gallery hole is enlarged to 5/16in, (7.9mm) diameter
The gallery depth to the face of the grub screw is 13/16in. (20.5mm)
There is no countersink or recess in the rear face of the SRM pump,
The ball seats against the pump face, even a very light "tap" on the ball will widen the sealing face noticeably
There is enough space around the ball for the oil to flow around it to the crankshaft bearings

Addendum,
I dismantled the cases today and measured the length of the plug that is fitted when modding to the A65 setup
The plug measures + - 17.5mm.

John
1961 Super Rocket
1963 RGS (ongoing)

Offline Daithi

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Lovely work John 👍 Are you doing that bearing conversion yourself?
Dave

Online chaterlea25

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Hi Daithi,
Quote
Are you doing that bearing conversion yourself?

No, that was SRM's work
I have rebuilt quite a few A engines with bush and needle roller conversions
Calculating the time involved and jigs that would need making it makes sense to me to hand the work to
people who do this every day
Having visited their workshop and seeing the tooling and machines they use, I feel I would be very hard pressed to equal their results

John
1961 Super Rocket
1963 RGS (ongoing)

Offline Daithi

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Hi John, sorry, just read your posts in the "wet sump/mag cut out" thread. The ball and spring mod is one I would attempt myself.
BTW, I wonder if you can recommend a good machinist to do a timing bush and big ends? I have never used a reamer on a timing side bush but am thinking about it... a lot.  *eek*
Thanks, Dave

Offline kiwipom

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hi guys, dont know where i got this from but shows removal of existing ball and spring from pump side, also information from SRM when i purchased a new pump,  may or may not be helpful info, cheers
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Online muskrat

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G'day kiwipom.
I would not try (in situ) to open up the hole to remove the ball and spring as one can not be 110% sure any swarf doesn't get into the oilway to the bearing/bush and prv. 3/8" is too large, 5/16" is the correct size.

Thanks John  *yeah*
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
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Online RDfella

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Kiwipom - I think musky misunderstood you post. As I read it you are suggesting a way to service the existing spring and valve, and the collar is to bring the hole back to normal size. Sounds worth investigating. but I'd really like to see a dimensioned section of that oil gallery before doing that. If someone were to section an old scrap casing, then we could produce drawings / dimemsions for these modifications.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Online RDfella

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Thanks for that info, Chaterlea. Very helpful and informative. Just what we need to better understand the issues involved.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Offline Swarfcut

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   On behalf of fellow sufferers, I raise a toast to the enlightenment furnished by Chaterlea John.
 Swarfy.

Online chaterlea25

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Hi All,

 
Quote
On behalf of fellow sufferers, I raise a toast to the enlightenment furnished by Chaterlea John.
 Swarfy.

 *red* *red* *red*
Embarrassed to say that the RGS engine is still in kit form having had the bottom end converted to needle roller, crank ground, dynamic balance, MAP rods, Wiseco pistons etc, etc  back in 2011/12

Some of the strip down disasters here,
https://www.a7a10.net/forum/index.php?topic=4556.msg30787#msg30787

Hoping to get stuck into my own projects over the next 12 months
John


1961 Super Rocket
1963 RGS (ongoing)

Online chaterlea25

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Hi All,
I modified the original post to add the measured length of the plug that is fitted behind the spring
it measures 17.5mm  + or -

John
1961 Super Rocket
1963 RGS (ongoing)

Online RDfella

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Following on from Kiwipom's suggestion, does anyone know the dimensions of the bore for the original grubscrew / spring / ball?
The idea of accessing this by opening the oil hole from the pump side and then refitting the oriiginal spring & ball by using a sleeve for the ball to seat against is certainly appealing.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Online duTch

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Quote
Following on from Kiwipom's suggestion, does anyone know the dimensions of the bore for the original grubscrew / spring / ball?....

 I would expect that to be only enough to allow the 1/4" ball to be 'free to move'   *dunno*
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
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Online muskrat

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G'day RD.
See reply #5 ^^^^^
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7