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Conference terri::cars_uk

Title:Cars in the UK
Notice:Please read new conference charter 1.70
Moderator:COMICS::SHELLEYELD
Created:Sun Mar 06 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2584
Total number of notes:63384

1990.0. "Zenith/Stromberg Advice Needed" by CHEFS::BRIGGSR (Four Flat Tyres on a Muddy Road) Fri Jan 15 1993 09:20

    
    I have a problem with a Carburettor....
    
    Make: Zenith 175CD (Stromberg)
    
    Symptoms: 		-	Poor fuel consumption.
    			-	Loses oil in dashpot within about 50 miles.
    
    Actions to date:	-	New diaphragm
    			-	New needle and jet
    			-	Hometune
    
    Basically, the car goes fine and returns 29mpg on a long run (which is
    good for a Volvo 240). However, when the dashpot oil runs out the car
    runs roughly, has no pull below 2000 rpm and the consumption plummets.
    
    The carb probably needs a major overhaul but I'm wondering whether
    there is one component that may be the obvious cause of this. Even
    though the needle and jet have been replaced I still wouldn't discount
    them as I was dubious about the garage that did the job. They put new
    parts in but were they the RIGHT parts?
    
    Richard
T.RTitleUserPersonal
Name		DateLines
1990.1PEKING::SMITHRWErr.....Fri Jan 15 1993 10:216
    I think your problems are the result of no oil in the dashpot.  If you
    can stop the oil disappearing, the rest will sort itself out (imho).
    
    Richard
1990.2CHEFS::BRIGGSRFour Flat Tyres on a Muddy RoadFri Jan 15 1993 15:256
    
    hmmm.... I sort of came to that conclusion myself! Question is why does
    the oil dissappear?
    
    
    Richard
1990.3PEKING::SMITHRWErr.....Fri Jan 15 1993 16:419
    If it isn't pissing out all over the top of the carb, it must be
    getting sucked in. Look for knackered seals, O-rings etc somewhere
    between the dashpot and the choke.
    
    (That's choke, not strangler flap....)
    
    Richard
1990.4looseseal?SEDSWS::BARRETTooh I knowThu Jan 21 1993 16:565
    
    Had the same problem on a Stag which uses the same carbs,there is a
    seal at the bottom of the tube the dashpots go in which is held in
    by a star washer if I remember correctly.You will have to take the 
    main needle out also to get at it.
1990.5CHEFS::BRIGGSRFour Flat Tyres on a Muddy RoadFri Jan 22 1993 09:259
    
    Very interesting. Although the car was drinking fuel and belching smoke
    before I had the needle and jet replaced by the aforementioned back
    street garage (read 'cheap') I never experienced this problem. Maybe
    they damaged or didn't replace this seal you refer to. It could also
    explain why the car (with a full dashpot) only runs 'OK' as opposed to
    'good'. A damaged seal, presumably could effect mixture, vacuum etc.
    
    Richard