Search found 770 matches

by ndevans
Thu Nov 14, 2019 9:53 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Nothing to report on my part, I'm afraid. I've not had time, last couple of weekends, and this weekend, are taken up with running events (as in racing).
Probably late Nov-early Dec I'll start to make more progress.

Cheers N
by ndevans
Mon Nov 04, 2019 6:43 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Thanks Phil. Before I go too much further, two questions. 1-am I right in thinking that using the marking compound to check and adjust the meshing pattern removes the need to use the dial indicator and slip gauge to measure the pinion height wrt the cage bearing seats, as described in the BMC manual...
by ndevans
Mon Nov 04, 2019 3:57 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

The yellow marking compound used in the link above to determine the tooth meshing is available from English Diff sales@englishdiff.com It is supplied with an application brush as part of the purchase. It also comes with instructions for use and examples of right and wrong tooth pattern. Also this t...
by ndevans
Sun Nov 03, 2019 5:03 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Right, thanks, I now have a better understanding!

I will get the pinion out of the 4.22 this week, and find out what sort of spacer I have.

Cheers N
by ndevans
Sun Nov 03, 2019 4:41 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Declan-so if I understand you correctly, you are suggesting using a shim to take up the wear in the bearings?
by ndevans
Sun Nov 03, 2019 3:19 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Phil, Declan, First of all, thanks for your time and patience in explaining (more than once!) to me. As regards setting the pinion height-I've tried setting the preload, with the pinion fully assembled with crush or solid spacers, and I couldn't get it to more than about 3-4inlb without exceeding th...
by ndevans
Sat Nov 02, 2019 9:39 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Ah....I hadn't thought of that! I'm a little confused though. As I understand it, you set the pinion height by adding/subtracting shims under the pinion head, but the preload on the pinion must be right before you measure the height. If the pinion height is not right, you have to dismantle again, th...
by ndevans
Sat Nov 02, 2019 4:45 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Yes, I've worked that out. They are one shot. I'll just have to go carefully. However, the 4.22 diff may have a solid spacer. There's only one way to find out.
by ndevans
Sat Nov 02, 2019 3:54 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

It does, thanks Paul. I guess the clue is in the name!
by ndevans
Fri Nov 01, 2019 10:34 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Reading back through the posts, I understand now that a pinion with a crush spacer does not need shims. So in the next few days, I am going to tap out the pinion on my 4.22:1 diff, see what sort of spacer it has, and renew it if it's a crush spacer, or adjust the shims if it's a solid spacer. Hopefu...
by ndevans
Fri Nov 01, 2019 4:26 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

It's annoying that the BMC manual only covers the solid spacer type. Well mine does, anyway.
by ndevans
Fri Nov 01, 2019 4:16 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Ok thanks. So, the question is, am I missing a shim, or do crush spacers not need shims?
by ndevans
Fri Nov 01, 2019 3:19 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Where was it fitted? Did you have a solid spacer?
by ndevans
Thu Oct 31, 2019 10:57 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Right, I see now. Confusingly, my hardcopy of the manual shows the shim between spacer and outer bearing as item 27, but my electronic copy shows it as item 29! Back to the spacers. I am a little unsure now. What I thought was a 21mm spacer and a shim between the crush washer and the pinion head, no...
by ndevans
Thu Oct 31, 2019 4:00 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Interestingly, the diagram in the the BMC manual, section HH, page 2, suggests that there is no shim between the solid spacer and the inner bearing, only a thrust washer between the inner bearing and the pinion head. Which is right?

Cheers N
by ndevans
Thu Oct 31, 2019 12:29 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

The BMC manual does talk about using a washer of "known thickness" when reassembling. You then use the dial indicator reading & the markings on the pinion head to increase or decrease the washer thickness, in order to set the pinion height correctly.
by ndevans
Thu Oct 31, 2019 10:09 am
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

PoolGuy wrote:
Thu Oct 31, 2019 9:47 am
Edit. Mr Evans may have solved it.
That'll be a first!

I haven't actually had them apart yet, but it looks like there may be a shim under the solid spacer. Will report later today.

cheers N
by ndevans
Thu Oct 31, 2019 9:42 am
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

There is. Think this photo may explain. IMG_20191031_090317~2.jpg This is the pinion from my 3.9:1 diff. Between the crush spacer and the pinion inner bearing is another spacer. The crush spacer has been crushed to approx.19mm, and the two combined measure just under 41mm. The solid spacer is marked...
by ndevans
Thu Oct 31, 2019 8:34 am
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Wow. That's no small difference.
by ndevans
Wed Oct 30, 2019 4:56 pm
Forum: Mechanical
Topic: Differential overhaul
Replies: 173
Views: 4172

Re: Differential overhaul

Ok thanks Phil. I'm prepared to buy another oil seal if necessary, I'd just like to avoid it.

So does the inner race just tap out?

And, if I have a crush spacer fitted, is it ok to fit a solid spacer and shims instead? I have a new crush spacer, just out of interest would like to know.

Cheers N