I thought my BW35 had a serious problem

Re: My BW35 has got a serious problem

Barten said:
Thanks Harvey. I gues you are right in that I have a tendency to go over the top and then thing sometimes get complicated. On the other hand, This time I could have just changed the broken shaft, and then the other side would probably have broken quite soon.
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You're absolutely correct about the second shaft. That would have snapped very soon.


Barten said:
Whether I shall change both the diff bearing is questionable, I think when I have it all open, I 'll do it as a precaution. The shaft bearings I will definitely change. The one on the broken side was not good.
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If you change the diff carrier bearings then you're probably going to have to reset the crownwheel/pinion backlash and the running clearance in the casing, so personally I'd closely examine the bearings, and if there aren't any visible faults, re-use them. I've never had problems with those. Same goes for the output shaft bearings, they're not prone to problems, and they can be turned in your hand to feel any rough spots, but the good thing with those is that changing them doesn't require any setting up afterwards.


Barten said:
But I will leave the rest of it as is. Your diagnose was very correct though, and saved me a lot of trouble. I could have been dismantling the BW35 now if it was not for your advise. Thanks!
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No problem.


Barten said:
There was one thing I did not understand in your second post to me : "and so don't put it in PARK otherwise you'll snap the pawl off"
What is the pawl? I did put it in park before that post, so what could have happened?
Regards, Barten
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There is a pawl on the output shaft of the BW35 that holds the car and stops it from rolling in PARK, if the diff is broken as in your case, and you drive through the box (so you see the speedo working) and then put it in PARK, then the rotating output shaft snaps the end of the pawl.
 
Re: My BW35 has got a serious problem

Thanks for that Harvey. Is there a way I may check if it is snapped now! Currently jacked rear end and no differential.
Regards, Barten
 
Re: My BW35 has got a serious problem

Barten said:
Thanks for that Harvey. Is there a way I may check if it is snapped now! Currently jacked rear end and no differential.
Regards, Barten
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Put the box in PARK, and try to turn the propshaft, if it doesn't turn, you're OK.
 
I got my new driveshaft and bearings thuesday. Only 4 days from England to Norway. I have been busy at work this week, but tomorrow I will fit the parts and hopefully put it all back together. I have got hold of some new oil I think is suitable for the diff. It is Castrol Axle EPX 80w-90. Any thought on the suitability of this oil in the diff?
Regards, Barten
 
Top work. Love that twisted shaft, I took one out of the midget that looked like that. They're a lot longer in that car, and like to snap while reversing, as they work harden in one direction.

Very useful pics, I've got loads of backlash in my diff so might be doing something similar too....
 
Today I started to reassemble my differential. The old driveshaft is to the left!

I pressed in a New bearing into the RHS housing, put on a New seal and drove the ddriveshaft into the bearing using my 20 ton press and the thrust collars as distance pieces. When starting to enter the shaft, I put on the new thrust collar and pressed it in Place With max 5 ton.


Then I had a major setback. The LHS housing was Next and I pressed in a new bearing. It was tight to begin With, then it just dropped in the last half cm. I could move it half a cm With my hands. My theory is that the bearing on that side (it was definitely faulty) has created heat and widened the bearing housing. I think I need a new bearing housing. Shait!

I took the new bearing out again, and tried the ok used one from the RHS. Just the same result, it was loose to move.
Any good advise except getting hold of a new bearing housing? (I Guess that is the only option) unless a really clever bodge can be done.
regards, Barten
 

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Hi Barten,

Why did need to replace the thrust collars? Do the old ones suffer damage during the removal process, or is there another reason? Are new thrust collars readily available?

Ron.
 
Hi Ron,
I did not have the correct Equipment to be able to remove them without damaging them. And I have a set of New thrust collars. Think I bought them from Steve Walker long time ago.
Regards, Barten
 
Hi, just prise the inner plastic band/disc out with a small screwdriver so the oil in the diff can get
to the bearing, we used to do this with any bearings in similar situations. Personally I think oil is a
better lubricant than (minimal) grease for bearings like this.

Colin
 
That is an idea. What is the consensus on this modifikation I wonder? As i have said further up, the lhs bearing was not good. I have had annoying bearing whine this summer, and checked the wheel bearings thoroughly without finding anything. It must have been the lhs driveshaft bearing. That one is open in both sides. I dont know if any others have used these sealed type bearings? If not I guess i have to be the guinea pig and use them as they are. I thought they were just dust seals, but they look to be quite sealing.
Regards, Barten
 
I'd prise out the inner side so the bearing gets splash lubricated as it would have originally. If you leave the other side in it may act as an extra seal.
 
Today my brown beauty was finally back on the road. The job took a long time to do and I had to order parts 4 times because i did not have the full overview over what was needed. I got hold of a good secondhand driveshaft assembly from Wins. That had a good bearing, so I did not change that. I reassembled the diff and filled with the correct amount of oil. Then I got the shingles desease for Christmas. I also found out that the outer driveshaft universal joints had seen much Better days. So last week I ordered the 4 Universal joints and when they arrived thuesday I went for it. Changed all the universal joints. The 2 inner joints were bone dry. The new ones has got grease nipples, the old ones did not. So after reassembling it all, I bled the aft brakes by having the wife to pump and hold for me. Took a 20 mile run tonight on mainly dry roads with some ice patches. It felt very smooth and everything seems to work well. Happy with that. Thanks to all that gave me advise during the job, it helped a lot!
Regards, Barten
 
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