British-Cars.org

Welcome to the DMR Site for British Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MG Y Type - Crown wheel & pinion identification

Help! I recently aquired a small job lot of MG spares and was told that anongst them were two 3.9 to 1 ratio CW&Ps suitable for uprating the YB. I planned to hold these as spares for my YB. Not so. The ratios are correct but part numbers are unknown to me (or Niel Cairns). One set is stamped 11/43. ATB7237 and ATB 7238 and the other is 11/43 BTB 457/458(outer diff casing for this one is ATB7182)
Can any of you guys out there help me ID these spares so I can pass them on to another user.Thanks.
Keith D Herkes

Sorry guys, got some of info all wrong.(old age creeping in).
They are NOT both the same ratio.
First CW&P details as stated, but also stamped MOWOG.
Second item is a complete Diff assembly.Outer casing ATB 7182. Crown wheel stamped MOWOG BTB 458. 9/41. This is therefore 4.55 to 1 ratio.
Keith D Herkes

Keith - they sound like Z-type Magnette or similar period car parts. The ZB used 9/41 and several other cars, Wolseleys, Austins, etc, used the 11/43. So did the MGB. I'll have a closer look in the daylight tomorrow at some similar bits I have lying around and see if the part numbers match at all.

Malcolm
Malcolm Robertson

Keith - my ZA diff housing has ATB 7182 cast on the casing, but the cwp assembly is ATB 7057 (that's a 4.875:1). Sounds like you have a ZB diff with the 9/41 4.55:1 ratio. You would expect the housings to be the same. Can't help with the 3.9 though, but my earlier comments stand.

The Magnette was the first MG to use the new Austin-derived, BMC componentry, such as the B-series motor. I presume the diffs were also Austin-derived and continued to be very widely used throughout the whole BMC-range. Weren't the Y, TD and TF, the last to use the Nuffield XPAG engines and diffs?

By the way, you will find that the diffs used three different types of splines in the sun gears - coarse (such as on the Magnette), fine and very fine - depending on which car they went into (just to make tacking down the source just a bit harder!).

Malcolm
Malcolm Robertson

Hi Malcomb.
Thanks for the information.These parts are proving somewhat harder to clearly identify that I first thought it would. But I'm sure I'll get there eventually. Any other thought from anybody welcome.
Keith D Herkes

This thread was discussed between 09/10/2006 and 16/10/2006

MG MG Y Type index

This thread is from the archives. Join this live forum now