Jump to content
Sign in to follow this  
boxofbits

Brass filings in my Overdrive

Recommended Posts

Evening All

While overhauling my TR4a gearbox I've noticed some brass filings residing in the lower front section of the overdrive unit. The only brass component I can see in the immediate vicinity is the brass bush which supports the mainshaft when inserted into the overdrive, but this doesn't look particularly worn.

It might be that they have migrated in the oil flow from another part of the overdrive, so without stripping the unit which works really well, I wondered if anyone has seen this before and it's most likely origin?

Regards

Kevin

 

image.jpeg

image.jpeg

Share this post


Link to post
Share on other sites

There's GOLD in them thar overdrives! I gonna stake my claim!

Share this post


Link to post
Share on other sites

That's a lot...not seen that in the overdrive before but had something similar in the box when the old style top hat bush had split in two and worn itself away....

Share this post


Link to post
Share on other sites
2 hours ago, Chilliman said:

That's a lot...not seen that in the overdrive before but had something similar in the box when the old style top hat bush had split in two and worn itself away....

Hi John

Funnily enough I did change the top hat bush, but not because it was worn. I changed it for a steel bush with a slightly wider thrust washer by about 0.005". The bush itself is in remarkable condition, and I cannot see any scuffing on the overdrive shaft bush. Unless its remnants from a previous repair, but would think they would've flushed it through?

Kevin

Share this post


Link to post
Share on other sites

I agree - you'd certainly like to think it is not the remnants of a previous repair, I would think the next most likely candidate in the overdrive unit would be the thrust washer at the base of the uni directional clutch which can break up...?

Share this post


Link to post
Share on other sites

My thoughts would be item 104 in the overdrive section of the Moss parts book. If these are slightly too large the planet gears happily machine them to size leaving traces of brass. It should be the right size now.

Share this post


Link to post
Share on other sites

Hi John/Tim

It looks like your diagnosis might be correct. Tim I think you may have been referring to the TR5/6 'A' type O/D as item 104, while I've been looking at the plate for the TR4a which I would think is the same item no: 66. However, the notes do bring some TRepidation!

66  THRUST WASHER

Notes: Total destruction of the thrust washer and its adjusting washers is a common occurrence, and will require skilled rectification to the casing and bushes. See less

500610

£18.00

Kevin

Share this post


Link to post
Share on other sites
2 hours ago, jerrytr5 said:

Syncro cones?

Jerry

Synchro's look good Jerry ( Dave thinks its gold:rolleyes:)

Kevin

Share this post


Link to post
Share on other sites

Kevin,

Yes, it is item 104 in the Moss TR6 parts book and if you are lucky it will have been machined to size but if not it will be broken. My overdrive was lucky.

Tim 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...

Important Information

Please familiarise yourself with our Terms and Conditions. By using this site, you agree to the following: Terms of Use.