• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

Axle Shaft Installation Difficulty - Help Sought

Scargo

Member
Country flag
Offline
A few months ago I picked up a 3.7 pumpkin for my Sprite to replace the 4.2. I finally got around to installing it over the last couple of days, and everything went fine until I went to install the left side axle shaft. The right side slid fully into place with ease but the left would not go in without the persuasion of a BFH. Prior to fitting the pumpkin to the axle housing, I did a trial fit of the axles while I had the pumpkin on the bench and both axles slid into place without issue.

I'd like to know if anyone here can suggest what the issue may have been with getting the left axle to slide all the way in once on the car. Also, given the fact that I had to force the axle into place, am I to expect some sort of trouble with the diff once I put the car back on the road.
 

Randyz

Member
Country flag
Offline
It may be possible that the axle housing is bent. I've never personally experienced this, but a very particular racecar builder/machinist friend insisted that bent axle housings were a major problem for Spridgets. He actually had a fixture built for checking and straightening axle housings. Unfortunately, he's retired now and sold off all of his equipment. I get concerned whenever a BFH is required to assemble anything!
 
OP
S

Scargo

Member
Country flag
Offline
The axles that came out to the old diff did so with ease and went in a couple of years ago with absolutely no effort.
 

Madflyer

Jedi Knight
Country flag
Offline
No EFFORT that is the key to most anything. I do not know if the shaft is keyed and I am sure you tried rotating diff and shaft Question does it start but not go to seat of housing? Does it rotate after you beat it in? I worry you may have damage carrier bearings depending how hard you hit and the number of times. It is also not uncommon for one axle to be longer that the other . Madflyer
 
OP
S

Scargo

Member
Country flag
Offline
The axle is fully seated, the screws are in place and the wheels are tightened down. Everything rotates fine by hand and under engine power up on jack stands.

[FONT=Arial, Helvetica, sans-serif]I had both hubs off the car in order to install slightly longer wheel studs in order to accommodate 3/8" spacers. The bearings never came out of the hubs. I'm wondering if one or more of the new wheel studs on that side of the car took up a bit crooked going in, although I cannot imagine that being possible. The reason I am thinking (and hoping) it may be stud related, is because it was at the point when the axle flange first came into contact with the end of the studs, that the problem surfaced.[/FONT]
 
OP
S

Scargo

Member
Country flag
Offline
This morning I removed the wheel and inspected the studs. They are all parallel with one another and I see no signs of marring on any of the threads. Given that, I placed the flange of a spare axle facing backwards onto the threads and it went on with absolutely no friction. So, my theory about the axle getting hung up on misaligned threads does not hold water. The end of the axle shaft was obviously hitting an obstruction inside the diff.


Again the diff seems to be operating without issue. While turning the brake drum by hand the driveshaft turns and when I ran it thru the gears, both wheels turned (right side more than the left side) and there were no obvious problems and no noise or vibration of any type.


I am asking the question .... should I road test it?
 

Joe Schlosser

Jedi Warrior
Silver
Country flag
Offline
Axle shaft should not require any force to install in the Axle although sometimes the last little bit requires a good push to slide over the last bit of the studs
Axle Splines fit into the 3.9 diff on the bench with no difficulty, Correct??
When inserting axle into diff with with new studs it is tight and requires a hammer to seat fully.
The only change was removing and reinstalling the hub with longer studs. Most likly something to do with the hub
Is the hub installed fully, that is completely square? Try removing the hub and see if the axle slides into the diff easily. If so there is an issue with the hub. With the hub off how does the axle fit on the hub?
 
OP
S

Scargo

Member
Country flag
Offline
Joe ... to answer your questions:

Axle Splines fit into the 3.9 diff on the bench with no difficulty, Correct?? I would not describe it as with "no" difficulty. Thinking back, one side inserted with total ease while the other side presented a bit more of a challenge. Unfortunately, I do not recall which side was more difficult but my money is on the left side.

Is the hub installed fully, that is completely square? I have to assume so, but that is only looking by eye. I have no way to actually measure it for squareness, but I do believe it is fully seated. Could the hub actually be installed without being perfectly square?

With the hub off how does the axle fit on the hub? I have not yet removed the hub and axle assembly.
 
OP
S

Scargo

Member
Country flag
Offline
Here's an update:

This morning I pulled the axle out, which was not as easy as one would normally expect it to be. I inspected the splines and they appeared to be in good condition. I tried to determine if the hub was rotating true by spinning it as fast as I could by hand. It appeared to run true, at least according to my eyes and without using any instruments. The bearing looked to be fully seated.

So I put a little bit of oil on the end of the spline of a spare axle and although it went in with a little more effort than normal, it went in easier than the other axle did a few days ago. I pulled it back out and after oiling the end of the permanent axle, I reinstalled it, again with a little more effort than one would expect, but with less effort than it took the other day. I thought this to be a positive sign in the right direction.

With the axle back in place, I rotated the drum and everything was working as it should. I then ran it thru the gears and still, no apparent issues. I then road tested it and all appears fine. No noises, whining or howling so I am going to leave well enough alone.

I want to thank all of you gents for chiming in with your opinions and suggestions. It was good hearing from everyone on what the perceived issue may have been and how to solve it.

By the way; I am loving this 3.7 gear as compared to the 4.2 which I removed. It has transformed the car.
 
Similar threads
Thread starter Title Forum Replies Date
svtmikey GT6 New axle shaft flanges too big [rotoflex] Triumph 3
RJS TR4/4A Grease for IRS Axle Shaft Splines Triumph 5
losmorob Rear axle shaft identification Spridgets 4
longbridgehealey oil from rear axle shaft Spridgets 16
LBCs_since_1988 TR6 TR6 Axle Shaft Failure Revisited Triumph 7
G Lesson learned in rear axle shaft removal Spridgets 2
F Removing Axle Half Shaft [Tube Type] MG 4
T More advise needed. This time the axle shaft..... Triumph 0
C TR2/3/3A TR2 Axle/wheel bearing removal Triumph 2
drooartz Rebuilding rear axle Spridgets 10
M TR2/3/3A Speedy Sleeve Repair Sleeves for Rear Axle Pinion and Half Shafts Triumph 1
CJD TR2/3/3A Lockheed Axle Triumph 8
M TR2/3/3A Re-Assembling Rear Axle Outer Bearing and Hub Triumph 1
M TR2/3/3A Rear Axle Bearing Grease Triumph 5
J TR6 Differential / Rear Axle Triumph 1
Tr3aguy TR2/3/3A Rear Axle Rebuild Triumph 3
G Trans Axle Parts Lotus 20
M TR2/3/3A Identifying Rear Axle Leak Source Triumph 12
T Axle spline lengths Spridgets 0
BN6_2197 Rear Axle rearing up Austin Healey 12
K Rear Axle Breathers Austin Healey 9
S Axle leak at backing plate Austin Healey 26
BN6_2197 Removing connecting link between shock absorber and rear axle Austin Healey 4
D Wanted TR4A Live axle frame Triumph Classifieds 0
John Turney BN4 to Early BJ8 Rear Axle Austin Healey 12
P TR2/3/3A Rear axle hub dis-assembly Triumph 1
S Rear axle - small leak .....? Austin Healey 7
T TR2/3/3A Will cable ties hold rear axle rubber buffer securely? Triumph 7
S Gearbox and axle serial numbers Austin Healey 7
P MGB Noisy Rear Axle / Differential MG 1
R Rear Axle Restoration Austin Healey 6
Rut TR4/4A 67 TR4a irs to live axle Triumph 18
Lin Rear Axle Hub Nuts Austin Healey 3
E For Sale Tr3 rear axle, rear end Triumph Classifieds 6
jfarris TR2/3/3A Changing rear wheel studs in a later Girling axle Triumph 3
K TR2/3/3A The rear axle "tube" seal replacement. Triumph 6
C Size of axle bearing nut Austin Healey 11
warwick-steve Oil for rear axle? Austin Healey 3
J Wanted Need tr3 rear axle housing Triumph Classifieds 0
KVH TR4/4A Do I Have an Axle Problem Triumph 11
Sarastro General TR How is the axle tube attached to the diff housing? Triumph 16
T TR4/4A Replacing in situ oils sealing gearbox and rear axle Triumph 18
Michael Oritt Wanted Wanted: Left side axle tube tip Spridgets Classified 0
gfholl Axle failure Spridgets 18
B How often should you change the rear rear axle oil Austin Healey 9
regularman Gear leaking from axle housing into rear brake drum Spridgets 3
Jim_Gruber Source for 3" cotter pins for bump rubber on BE Rear axle Spridgets 5
T TR2/3/3A Rear Axle Vent Triumph 12
Jim_Stevens TR2/3/3A Axle to leaf spring torque Triumph 2
Jim_Gruber Removing the Rear Axle Seal Spridgets 4

Similar threads

Top