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Clayton Dewandre -Another messy one...

Discussion in 'Harrington Alpine' started by bernd_st, Aug 31, 2019.

  1. bernd_st

    bernd_st Bronze Level Sponsor

    Just obtained another "good condition" Clayton Brake Servo from UK generating quite some fun .
    From the outside it looked rather clean but on the inside :mad:...
    Anyway the good news is that the diaphragm is still OK.

    By the way does anybody know a good tool for opening that dreaded holed center nut giving access to the hydraulics chamber ? IMG_20190831_150222.jpg IMG_20190831_150312.jpg
     
  2. alpine_64

    alpine_64 Donation Time

    Always wondered why rootes opted for the CDwe Servos on the Harrington ... They had 2 home grown comon options...
     
  3. bernd_st

    bernd_st Bronze Level Sponsor

    Several UK car makers used the Clayton's in the early 60's. This one actually came from a Triumph guy. Perhaps the Girling one wasn't finally developed or ready for masspro at that time.
    If I compare both however the Clayton is much better designed. Alu diecast housing - less weight, thicker and more durable diaphragm,etc. .On the other hand I suspect cost must have been higher that's why it was mainly offered as an option...
     
    Last edited: Sep 1, 2019
  4. Bill Blue

    Bill Blue Diamond Level Sponsor

    By the way does anybody know a good tool for opening that dreaded holed center nut giving access to the hydraulics chamber ?

    Looks like it takes a pin spanner. They are not very common on this side of the pond, I would probably make one. The tricky part is finding material of the proper size and temper to use as pins.

    Bill
     
  5. bernd_st

    bernd_st Bronze Level Sponsor

    Thanks. Yes a strong and durable pin spanner would be required. I made one myself out of a 1/2" steel water tube and two wires welded to it. However it didn't prove strong enough since the nut is well coroded into the thread. Contact corrosion of the different materials is a big issue with these Clayton's...
     
  6. Bill Blue

    Bill Blue Diamond Level Sponsor

    I'd try roll pins, large enough they would collapse a bit as they were driven into the holes. The pins are spring steel and pretty tough. The "wrench" portion could have slightly oversized hole so it would slide onto the pins. No welding allowed, the heat destroys the temper of the spring steel.

    Bill
     
  7. bernd_st

    bernd_st Bronze Level Sponsor

    Sounds like a plan. Will try it then...
     
  8. Barry

    Barry Platinum Level Sponsor

    Last edited: Sep 2, 2019
  9. bernd_st

    bernd_st Bronze Level Sponsor

    Interesting suggestion. However it doesn't work for this application since that dreaded nut sits deep in the vacuum chamber...
     
  10. Barry

    Barry Platinum Level Sponsor

  11. 65beam

    65beam Bronze Level Sponsor

    Go to your local hardware or home store and buy a basin wrench for use on kitchen faucets. Apply a little heat and loosen the nut.
     
  12. bernd_st

    bernd_st Bronze Level Sponsor

    Heat might work, but I'm doubtful regarding the basin wrench. Not easy to apply circular grip trip to the nut since it sits low in the hydraulik opening. Guess I need to find a suitable pin wrench still...
     
  13. bernd_st

    bernd_st Bronze Level Sponsor

    No proper tool found. Today I remembered my "wonder weapon" which is the centre piece of an old crossmember fulcrum pin. Spot-welded it to that dreaded nut. Quite some heat and brute force applied with a 3/4 spanner ultimately removed it. Found more rust horror underneath but made a big step forward :) IMG_20190907_203542.jpg

    P.S. Nothing to worry about: The pin will be cut off with an angle grinder later...
     
    Last edited: Sep 8, 2019
  14. bernd_st

    bernd_st Bronze Level Sponsor

    Just got a bunch of stainless No. 10 UNC slotted head screws which will replace the rotten vacuum chamber ones. They do fit excellently but wondering which size are the suction chamber ones. Either No. 8 or No. 6 UNC. Who can enlighten me ?
     
  15. bernd_st

    bernd_st Bronze Level Sponsor

    Nobody ?! Ok ultimately measured the diameter which is around 4mm, so they should be No.8 UNC's ...
     
  16. Limey

    Limey Diamond Level Sponsor

    Good luck Bernd. I had the same issue. In the end I sent it away to be bored and sleeved.

    Oddly enough I bought a NOS one this week as they don't come round to often. Didn't you find a NOS one this year as well?

    Oliver

    PS the Le Mans genuine engine block 'Sold' (?) for £4000 At least that is what the advert said

    IMG_1743.jpg
     
  17. 65beam

    65beam Bronze Level Sponsor

    The booster itself seems to be less complicated than the Girlings. This one has been modified and should never be a problem in the future. 101_0042.JPG
     
  18. bernd_st

    bernd_st Bronze Level Sponsor

    I wonder whether anybody out there has some long term Clayton useage experiences . But would believe they should work fine once properly rebuilt. At least much better than the dreaded "piston sticking" Girling ones..

    Oliver: Is there a good company in UK which you could recommend for a re-sleeve ? How much did you pay ? Can you pls. post a picture showing the front side

    P.S. Yes I ended up have 4 now (used / NOS) and trying to assemble at least one good one out of these. 2 have rotten cylinder bores, 1 misses the diaphragm, 3 miss the brake line adaptors and so on. At least a good parts pile to start from. Documentation is not much plus extremely difficult to find the proper seals. Somebody told me that Girling ones would partially fit but doubt that....

    P.P.S. 4k for the engine block is still much high , wonder whether the 3000 RW owner finally went for it...
     
    Last edited: Sep 27, 2019
  19. Limey

    Limey Diamond Level Sponsor

    Hi Bernd,

    Try http://www.pastparts.co.uk

    I think it was around £100 to have a stainless steel liner fitted, piston seals and a general clean and overhaul (I did not need the main diaphragm replacing tho')

    I can recommend 'Aluminium Brightener' for getting the castings nearly as good as new. Most Ali cleaner leave the metal dull. This stuff leaves it much brighter.

    If I was the US owner I would definitely have paid £4K because the engine he has know does not look like the original one to me....

    Oliver
     

    Attached Files:

  20. bernd_st

    bernd_st Bronze Level Sponsor

    Oliver,

    perfect , thanks for link. Will try them. Hope they can provide the rubber seals - the diaphragm certainly not. Alu brightener treatment to follow later...
     

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