Rebuilding the Datsun 240Z half shafts or Drive Shafts (per Datsun FSM) – is indeed a do-it-yourself project. There are tons of references on the internet, and I’ve made several of the links available below.
I have rebuilt the half shafts in my 1971 Datsun 240Z. I took a bunch of photos of the dis-assembly and re-assembly, and added copious notes about my experience.
Factory Service Manual Pages
First, here are scans of the 1971 Datsun 240Z FSM Half Shaft Manual Pages RA-10 through RA-14. (28mb)
It makes sense familiarize yourself with the major components
The Replacement Parts
Universal Joints (#s 10, 12, 13 & 14)
Rubber boot (# 5) and front-and-rear boot bands (#’s 6)
Here are all the parts ready for installation. Two extra u-joints are for the drive shaft.
Everything was not as it seemed! Read the caution, below.
Removing the half shafts
Jack the rear of the car onto axle stands. You will need to remove the 8 bolts (4 at each end) that secure the half-shaft at the differential end and at the rear wheel. If you start by the wheel, leave two bolts & nuts in place (finger tight) so the half-shaft is not flopping around while you try to remove the bolts at the other end. Not an issue if you start at the differential end.
You will need to remove one bolt, spin the shaft, remove one bolt, spin the shaft, repeat.
The connection at the differential end required some work with my 2.5 pound sledge hammer to get the two parts to separate. There isn’t a lot of ‘swinging room’ and the joint is very near the diff, so be careful and patient. Many years and a little bit of rust is all it takes.
Removing the U-Joints
I found this great reference on removing U-Joints from ClassicZCars.com.
“Change a U-Joint with a hammer” http://youtu.be/8jpME2VD1oA.
Installing a U-Joint (with a press): http://youtu.be/aE9aNHFehqw
240z half shaft U-joints part 1 – YouTube
I used a vise and my 2.5 pound sledge hammer to remove the u-joints. Worked fine. Go slow, make sure everything is lined up.
Dis-assembly of the half-shafts
Re-assembly of half-shafts
By this definition, I am now a “half-shaft expert”. Please learn from my mistakes and follow the learnings in the slideshow below.
Remember to grease the U-joints. Here is a helpful hint from EuroDat
When I first purchased the car
Here is what one of the half-shaft U-joints looked like when I first bought the car. It is pretty obvious that the u-joints were already leaking a LOT of grease back then.