Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: Stromberg CD 150 help please!
prawnabie

posted on 28/9/16 at 12:27 PM Reply With Quote
Stromberg CD 150 help please!

Hi all,

I have a 13/60 Herald with a single CD150 on that I have just replaced the diaphragm on but I think that the piston is sticking as I can only get the metallic "click" of it hitting the casting when I flick it up against the diaphragm quickly so it comes back down with some force. If I lift it up with my finger and let it go, it stops about a mm or 2 away from the bottom of the carb body. Also, if the piston is lifted up too far, the diaphragm will turn inside out and the piston need to be pushed back down through the dashpot damper hole.

The above all happens whether the entire jet assy is in place or not, the piston also isn't binding on the body anywhere. The diaphragm is also installed correctly with the tabs lining up with the holes in the carb body.

Does anyone have any experience of this???

Thanks,
Shaun

View User's Profile View All Posts By User U2U Member
r1_pete

posted on 28/9/16 at 12:34 PM Reply With Quote
Obvious thing first, have you got the return spring installed?
View User's Profile E-Mail User Visit User's Homepage View All Posts By User U2U Member
prawnabie

posted on 28/9/16 at 01:14 PM Reply With Quote
Yeah that is in, but it is more of a slinky spring that a return spring!
View User's Profile View All Posts By User U2U Member
britishtrident

posted on 28/9/16 at 01:35 PM Reply With Quote
Is it the early type (fixed needle) or the later type (floating needle) if the early type you may need to re-centre the jet following the procedure in the manual if later type just slackening slightly the four screws on the dashpot giving it a very gentle tap on the side and very carefully re-tighten using a diagonal tightening pattern 1/2 turn on each screw at at time.

If that doesn't work after a couple of attempts you have either a bent needle or the centre guide is gunged up or you are fitting the dashpot the wrong way round.





[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]

View User's Profile View All Posts By User U2U Member
britishtrident

posted on 28/9/16 at 01:37 PM Reply With Quote
Is it the early type (fixed needle) or the later type (floating needle) if the early type you may need to re-centre the jet following the procedure in the manual if later type just slackening slightly the four screws on the dashpot giving it a very gentle tap on the side and very carefully re-tighten using a diagonal tightening pattern 1/4 turn on each screw at at time.

If that doesn't work after a couple of attempts you have either a bent needle or the centre guide is gunged up or you are fitting the dashpot the wrong way round.





[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]

View User's Profile View All Posts By User U2U Member
Smoking Frog

posted on 28/9/16 at 03:23 PM Reply With Quote
quote:

the diaphragm will turn inside out


quote:

it stops about a mm or 2 away from the bottom of the carb body



Do you have the correct diaphragm?

View User's Profile View All Posts By User U2U Member
rusty nuts

posted on 28/9/16 at 05:48 PM Reply With Quote
If the piston is sticking with the jet assembly removed have you checked the piston slides freely in the cover with both parts removed from the car? If it's free itmight be worth rotating the cover 90 degrees at a time to see if that helps. If that fails then try a different diaphragm .
View User's Profile View All Posts By User U2U Member
prawnabie

posted on 28/9/16 at 07:50 PM Reply With Quote
Hi all,

I have had a better look today, the needle is bent, but as above I dont have the jet housing installed so that's not the problem, I also have the dashpot cover on the correct way round, with the lump on the neck facing the air filter.

I have replaced the new diaphragm with the old one - they are exactly the same size, the only difference begin the old one is a bit more "supple" due to age and the piston slides up and down perfectly!! I am going to go with the old diaphragm whilst I research into it a bit more!

Thanks for all the replies!

View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.