[Mg-mmm] KN0389 gearbox, J2 rear housing

[BOB GRUNAU]

Hi Ray,
I used The J2 Howell book and found the KN gearbox quite easy to strip
following his instructions. I stripped it from the back.
Hardest part was working up nerve to open it up.
I had done my PA box several years ago and it worked out OK though the gears
are worn and so noisy.

I don't know if a 3 speed M type is the same/similar, but I think anyone can
rebuild these gearboxes.

Waiting for a flood of KN 5/12 odometer gear offers  :-)
Bob
Bob Grunau
150 Pinewood Trail
Mississauga, Ontario
Canada, L5G-2L1
905-274-4136
grunau.garage at sympatico.ca


  -----Original Message-----
  From: spook01 at comcast.net [mailto:spook01 at comcast.net]
  Sent: Sunday, February 06, 2011 2:23 PM
  To: BOB GRUNAU; mg-mmm at autox.team.net
  Subject: Re: [Mg-mmm] KN0389 gearbox, J2 rear housing


  Well, Since we're on the subject....who can rebuild my m type 3 speed?
  Ray

  Sent from my Verizon Wireless Phone

  ----- Reply message -----
  From: "BOB GRUNAU" <grunau.garage at sympatico.ca>
  Date: Sun, Feb 6, 2011 11:09
  Subject: [Mg-mmm] KN0389 gearbox, J2 rear housing
  To: <mg-mmm at autox.team.net>

  Hi Guys,
  Pretty quiet on the NAMMM scene so a few questions:

  1-I have KN0389 gearbox apart and most of it is in excellent "as new "
  condition. I am replacing the ball bearings. These are SKF6207-1RS front
and
  R&M MJ7/8 rear. No problem buying the front metric bearing. However the
rear
  MJ7/8" inch bearing is still available from some suppliers , but SKF say
  none in North America and not going to import anymore. So anyone planning
to
  rebuild the Wolsely MMM gearbox should source the rear ball bearing early.
  SKF number is RMS7.

  2-The odometer gears in KN0389 gearbox are stripped and I need a new gear
on
  the mainshaft and new pinion to drive the cable. The numbers are 5/12, 5
  teeth on the mainshaft and 12 on the pinion. I understand these are the
same
  gears as in the N Type cars. P Type cars use 4/10 gears, and I will install
  this set if I can find a pair.
  Anybody have either 5/12 or 4/10 speedo/odometer gears for sale?? THanks.

  3-I have a J2 new block and am trying to source a new rear engine housing
  the has the 'EARS " and bolts onto the block with 6 bolts. I think I have a
  line on an MG M Type housing. Can anybody confirm the M housing is the same
  as J2? At first glance, by photos, they appear the same.

  Thanks from snowy Canada for any advice and help.
  Best regards, Bob
  Bob Grunau
  150 Pinewood Trail
  Mississauga, Ontario
  Canada, L5G-2L1
  905-274-4136
  grunau.garage at sympatico.ca
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