engine and drivetrain Getrag 240 M42 rear housing swap

[Sierpien]

I bought an M42 engine, and i`m going to put it in an 316 E21.

My question is, any body knows if the rear section of the M42 240 getrag can be swap with the e21 320i getrag rear section to run the mechanical speedo?

Answers will be apreciated!

[Preyupy]

The answer is NO, the 240 is a 2 piece housing and the 245 is a 3 piece housing. the shift rods and detents are in completly different places.

[Sierpien]

I forgot to mention something, the E21 320i gearbox, its a later Getrag 240.

So again, can i interchange rear sections between the 2 getrags 240?

[Preyupy]

I have never done a 240 but have done a lot of the 245's. My guess the easiest way will be to change the bell housing part of the geabox. If it is like the 245 the entire gear assembly comes out along with the rear cover, leaving just the input shaft bearing and the front countershaft bearing in the bell housing. It should just swap into the bell housing for the M42. I do this a lot with the 245's between the M10 4cyl and the M20 6 cyl transmissions.

You will need to check and set the shims for the end float of the gear stacks inside the cases once you change the bell housings.

[Colin]

I bought an M42 engine, and i`m going to put it in an 316 E21.

My question is, any body knows if the rear section of the M42 240 getrag can be swap with the e21 320i getrag rear section to run the mechanical speedo?

Answers will be apreciated!

I believe that you can.

[RogueDriver]

I had similar aspirations. I ended up with a GPS conversion done by a local speedo shop instead. Some of the info I found is here:

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,viewtopic/t,286395/highlight,m42/

and here:

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,viewtopic/t,331327/highlight,m42+cable/