Confusion reigns

[LEE240ZPERTH]

Guys

I have a 1970 240 that has recently undergone a restoration job, one of the last things to do is fix the speedo, a nice easy job or so I thought.

Here is the problem, I have an original gearbox, I know this because when I asked Nissan for the front and rear oil seals prior to re fitting the g/box they gave me the wrong ones and they did'nt fit, I took them back and he confirmed that they were not for a 1970 box, he ordered the correct ones and they were fitted without a problem.

I then got the same guy to order the speedo drive gear and housing which had to come from Japan, once they arrived I took the car to a mechanic friend of mine who rang me within half an hour and said I had been given the wrong part, I made a quick call to Nissan with the purpose of giving them a bit of abuse for the second screw up but was told I had been given the correct part (after they had double checked)

Does anyone have a picture of what the correct drive gear and housing look like for my Zed.

Any help is much appreciated.

Lee

[zeiss150]

Well I looked into it a little bit and from what I can guess If you have a 70 240 and its a 4 speed you should have a 3.54:1 R180 rear end. The speedo gears are color coded....

Yellow = 3.36:1

Black = 3.54:1

Blue = 3.70:1

white = 3.90:1

red = 4.11:1

purple = 4.38:1

so the long and short of it is that you need a Yellow speedo gear ... unless you have an automatic transmition then you would need a black gear. Suposedly if you have an auto tran in 70 it came with a 3.54 instead of the 3.36 with the 4 speed. I didn't think they made an auto trans for the 70 240 ... but what do I know :stupid:

matt-

[halz]

...and for a '70 5-speed?

[datto_240z]

zeiss150, Australian manual gearboxes got the 5 speed. Only America got the 4 speed. I guess the 5 speed would still have colour coding similar. I donno.

Cheer'z'

Chris

[zeiss150]

Hey datto,

Good to know! the trans doesn't really make a differance. It's the differential that determines the speedo gear.

Matt-

[LanceM]

Right on that the colors are all the same for the different transmissions, the spedo drive gears change between all the manuals. The housings that hold the gear are different between the 4 and 5 speeds and I believe but am not sure between the series 1 and 2 4 speed.

[biker]

Give this site a go Lee

Should give you a good idea - currently about to change out mine. Doesn't matter about the color only the number of teeth.

Biker:classic:

http://geocities.com/zgarage2001/engine.html

[Zedrally]

There are 2 types of 5 speed boxes [in Aus that I know of]:-

The early 5 speed boxes where a flange fit. ie bolt on to the trans shaft.

The later boxes and more common [in Aus] is a sleeve fit.

I had no idea that the speedo gear carrier was different as I've never had the different types side by side?

[zeiss150]

The grear sleevs are different because the gears have different amout of teeth. The more teeth the gear has the bigger the gear, and a less amount of teeth has a smaller gear. So with a bigger gear you need an offset so it will mesh with the trans. with a smaller gear you need the opisit offset so it will mesh with the trans.

The gears are deffinatly color coded. it works like this

yellow =16 tooth

black =17 tooth

blue =18 tooth

white = 19 tooth

red = 20 tooth

purple = 21 tooth

you can't get a red spedo gear with 16 teeth... it would have 20.

once again the trans doesn't matter its the differential that determins the speedo gear you need.

Belive me I know, I had to figure this crap out on my own :mad:

I curently own the yellow, black, blue, and red speedo gears:stupid:

By the way if your ever thinking about picking up a used diff from the junk yard you can just pull the speedo gear out and check the color to see what gear ratio the diff has.

Hope this helped

Matt-

[LEE240ZPERTH]

Thanks for all the help guy's, very much appreciated, I think my problem is that I have the right drive gear (white) but possibly the wrong housing, it's going back to the workshop tomorrow anyway and I am getting the mechanic to see if he can fit the new gear using the existing housing.

Hopefully everything will go ok, then I can go back to Nissan with the housing and see if they sold me another wrong part:stupid:

The info that was given regards this problem was interesting, thanks again.

Lee