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S4 Stromberg Confusion

PostPosted: Thu May 08, 2014 7:56 pm
by peterexpart
I put the car back on the road today, Mot done, Insurance done Etc, however the engine seems to be running very rich. Removed the Carb tops and decided to check on the Needle settings but that is where the confusion starts !!.
I punched out both Needles with their holders, they are both Spring Loaded in a small Brass Body held into the Pistons with Grub Screws and each Brass Body has a small Cap Screw on the top which can be accessed through the piston body but the confusion is, should these Screws "adjust" the height of the Needle or are they just there to Cap off the Needle Housing, as it does not matter if they are screwed in or out, they do not touch the needle nor do they appear to come into contact with it at any time, is there something missing ???

Re: S4 Stromberg Confusion

PostPosted: Fri May 09, 2014 6:09 am
by 69S4
The top screws should thread into the brass needle holder and as you turn them should move the whole assembly - needle holder and needle, up or down. There should be a second grub screw on the side to stop the brass holder rotating.

The top screws come in two types - an allen head or a blade type (I've got one of each!) so you'll need the appropriate type of adjuster. There should be an O ring on each one to stop damping oil leakage and a spring clip on the top to hold the thing in place (which I don't have).

Starting point for the needle is with the bottom of the brass holder level with the bridge of the slide and one turn either way on the adjuster is about as much as you should need. If the adjuster does nothing its probably been turned too much and unscrewed itself.

Re: S4 Stromberg Confusion

PostPosted: Fri May 09, 2014 10:09 pm
by peterexpart
Thanks for that, have now re-set the Jet Heights, Needles and the Float Heights {again} and all seems to be back to normal, seems odd driving the car that has been off the road for 25 years, it does go surprisingly well but is a loud little bugger !!!