• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

TR4/4A TR4 IRS boot instalation

Share this page

T

TexasKnucklehead

Jedi Knight
Country flag
Offline
Moss part 680-100 is rubber boot with one side bigger than the other for each of the IRS half shafts. I assume the only way to install it is to cut the smaller end? Is there some trick to install these? How can the small end fit over the nut?
 
You shouldn't cut anything. Put it on as you fit the two pieces together, can't do it with everything in place.
 
Right. But with the halves split, I can slip the small end of the boot onto the splined shaft. But in order to assemble, the locking collar nut has to be threaded onto the other shaft half. How do you get the boot around the nut?
 
I'm missing something. I did have two different versions of the male end of the shaft. As I remember one had nothing, the other was threaded with a collar (sleeve) that threaded on the shaft for a seal. No nut.
 
Maybe pictures would help, but I recall it was something like:

1. Disassemble the halfshafts, including taking the "nut" off. There is a cork seal and a split washer inside the cap that you take out, then the cap slides off.
2. Put the boot over the smaller shaft.
3. Put the cap back in place.
4. Assemble the halfshaft, slide the wide end of the boot into the thicker shaft.
 
Here are some pictures of one of my spare axles showing the boot pulled back from the large end.

dcp_1812.jpg

dcp_1815.jpg

dcp_1814.jpg


Scott
 
sail said:
I'm missing something. I did have two different versions of the male end of the shaft. As I remember one had nothing, the other was threaded with a collar (sleeve) that threaded on the shaft for a seal. No nut.
Click to expand...

Richard,

Sounds like one of yours was a TR6 half-shaft (without the nut).

Scott
 
Scott, yes one like your pict and one w/o the cap. Something happened back there, the trailing arm was also cobbled with a TR6 arm. Marvin Gruber came up with the correct trailing arm and I stuck with the 6 half shaft.
I still don't see the problem with attaching the boot. Pict?
 
Doh! I didn't know the nut (cap) came off. I picked some hard grease out of there. I guess I need to look a little harder.

It always makes more sense when someone tells you what should have been obvious.

Thanks a bunch. I'm a little embarrassed now...
 
TexasKnucklehead said:
It always makes more sense when someone tells you what should have been obvious.

Thanks a bunch. I'm a little embarrassed now...
Click to expand...

No worries, I'm pretty sure that most of us have been there/done that!

-Darrell
 
The part I failed to see was the split washer and nut (locking collar) in the center of the picture.
All is right in the world again...half-shaft_nut.jpg
 
TexasKnucklehead said:
The part I failed to see was the split washer and nut (locking collar) in the center of the picture.
Click to expand...

There should also be a cork washer/seal in there, which may have long since perished. Someone have me a hunk of quad o-ring material (the profile was like four o-rings together, sort of a square with rounded corners and grooves along the sides). I used that to make some new seals. Of course, it is all inside the boot, but I think the idea is to keep the grease down on the splines instead of migrating away.
 
TexasKnucklehead said:
The part I failed to see was the split washer and nut (locking collar) in the center of the picture.
All is right in the world again...
Click to expand...

Did someone install a TR4A half-shaft on your TR6 or did you add a TR4A to your collection and forget to let us know? :smile:

Scott
 
I had the same issue on my TR4A. Passenger side rear had the threaded collar holding the half shaft together. (Couldn't find any washer or anything to put in it and after talking to several repair shops, they told me that there isn't a washer in there, it was just old hardened grease.) I just recently undid the driver side rear only to find that the half shaft parts did not have a threaded collar at all. It just freely pulled apart. Not sure why or that it matters but it is curious and unexplained. The rear shock link was bent and two of the bolts holding the trailing arm bracket to the frame were very hard to thread the nuts off like they had been bent or stretched ever so little. Maybe there had been some damage to this side and the half shaft had been replaced. Don't know and can't tell. Curious.............................
 
Back
Top