Difference between plunger and swing arm layshaft

[a10rgs]

Hi,

can anybody tell me what the difference between the plunger G/B and the swing arm G/B layshaft is?

Regards
Uwe

[Swarfcut]

Quick answer is that dimensionally and splinewise they are identical, so either will fit.

BUT....pressed on layshaft pinion drive gears differ, the drive dogs have a different profile, and the locating circlip groove position is also different. As an assembly, these three parts ( layshaft, pinion and the third gear layshaft 23 tooth sliding gear) can be used for either box.

 S/A layshaft has oil spiral groove at blind bush end, Plunger is plain shaft.  Both carry the same speedo drive gear.

 Swarfy.

[a10rgs]

Hi Swarfy,

many thanks for your quick reply!

Uwe

[Swarfcut]

 I can also add that if you are careful positioning the pressed on layshaft pinion then the circlip can be left off, and just the layshaft swapped, leaving the original gears to run in their original position.

 That pinion can be difficult to change without a fair amount of force, (use a press rather than the big hammer and steel tube of the backyard maestro,) the circlip just serves to locate the pinion in a production setting. The layshaft endfloat depends on the pinion final position on the layshaft. There is an oilway drilling in both layshaft and pinion, try to get the two to line up. Pinion ends up a few thou proud of the layshaft splines, pinion face, not layshaft, bears against blind bush flange.

 Swarfy.

[a10rgs]

Hi Swarfy,

many thanks for this information particulary about the oil way line up!

Uwe