Bristol Cars - Owners and Enthusiasts Forum  

Go Back   Bristol Cars - Owners and Enthusiasts Forum > Bristol Forums > 6 cyl Bristol cars

6 cyl Bristol cars Type 400 to Type 406

403 rear Suspension

Reply
 
Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 05-05-20, 04:41 PM
Member
 
Join Date: Feb 2016
Posts: 4
Default 403 rear Suspension

Want to top up the oil in the rear units, is the filler plug the very large bolt and if so any tips as to how to undo as it is very tight. Intend putting Penrite Steering Box Lub in if I ever find my way in.
Reply With Quote
  #2 (permalink)  
Old 05-05-20, 08:50 PM
Member
 
Join Date: Oct 2010
Posts: 7
Default

Hi Don,
You need to be careful with this one because no dirt at all must get inside the unit when you undo the top nut and that nut which is the filler cap is some light alloy and all 4 of them on my 400 were oxidised and hard to shift-you have to do the front ones too- the light alloy was easy to burr so apply wd40 and give it lots of time to work and use the right socket or a ring spanner-can’t remember size but can check tomorrow if no one posts it in meantime. Next time it’s an easy job and probably best to check levels twice a year because they can leak.
Finally Millers Oils do a ‘shock absorber oil light’ which is the right viscosity. You need to leave a small air gap between the oil level and the bottom of filler neck- best check manual for correct advice but from memory 1/4”
Stay safe (and sane)
Daniel

Last edited by Daniel; 06-05-20 at 09:03 AM.
Reply With Quote
  #3 (permalink)  
Old 05-05-20, 10:25 PM
Member
 
Join Date: Jul 2008
Location: Sydney, Australia
Posts: 324
Default

Don
Daniel's post refers to the 400 suspension units that have shock absorbers incorporated in them . They just need to be filled to the correct level with Shock oil and check regularly as the seals often leak.

The 403 use the same alloy body as the 400 and the Penrite steering box lube can be used but its very difficult to fill as it does not really flow.
I suggest you remove one of the large plugs on the side of the unit and clean the unit out the best you can . You will need the correct ring spanner to undo the plug. I found that using a large "G" clamp to hold the ring spanner on to the large plug stops the ring spanner from slipping off and damaging the plug. They are very tight !!!
To fill with the steering box lube, as Daniel mentioned make sure you clean the outside of the body thoroughly , then using a large oil syringe force the lube through the small plug on the outside of the body , that is after removing the filler plug at the top to allow the air to escape.

If they continue to leak they will require removal from the chassis and a complete strip down with new seals and probably bearings. But worth a try first .

Geoff
Reply With Quote
  #4 (permalink)  
Old 06-05-20, 11:06 AM
Member
 
Join Date: Feb 2016
Posts: 4
Default

Thanks Geoff and Daniel very useful.
I think my best plan is to find a suitable socket or ring key (mine are just too small) soak with WD40 and then carefully try and free the thread, meanwhile while it's on the jack will check rear axle level (which I do quite often anyway).
Wish me luck and thanks again.

Don
Reply With Quote
  #5 (permalink)  
Old 07-05-20, 01:22 PM
Member
 
Join Date: Nov 2011
Posts: 15
Default

from recollection, it might be 3/8 bsf head and so take an 18mm spanner quite well - The Classic Mechanic: MM, AF, BSW, BSF Spanner Conversion Chart

however, be careful, because the plug you are trying to undo is aluminium and very easy to damage. before realising this, I tried to undo mine with an impact wrench, and ended up having to take off the whole unit...
Reply With Quote
  #6 (permalink)  
Old 13-05-20, 02:03 PM
Member
 
Join Date: Oct 2010
Posts: 7
Default Socket size

Always bearing in mind my car is a 400 not 403, the caps on my car’s dampers fitted an 11/16 AF socket snugly- which is obviously wrong but worked!
Reply With Quote
  #7 (permalink)  
Old 13-05-20, 02:54 PM
Member
 
Join Date: Feb 2016
Posts: 4
Default

Decided not to remove large plugs to clean out unit but made do with removing the top plug (no problem) and filling with Steering box lub, using a hair dryer to make the oil run easier. Thanks everyone for your advice, looking forward to getting back on the road when normality returns.

Don
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


All times are GMT. The time now is 08:05 AM.


This is the live site

Search Engine Friendly URLs by vBSEO 3.6.0 PL2