• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)

Zenith Stromberg O ring question


On the ZS CD 175 with adjustable needle; is the o ring that seals the needle a round profile or is it a square profile? I ask because I've got an assortment of o rings, and if I don't have to buy something new, that's a good thing.
Thanks for any info.


I have only taken one Stromberg with adjustable needle apart and I remember it being a round section o-ring.


Country flag
I agree with Doug, it's been a day or two since I tore into one and recall it being round.


Great Pumpkin
Country flag
O-Ring has a round profile. And a bugger to get the retaining star washer out. I've found a long hooked pick to be the best tool to get that retainer into a vertical position in the tube to then pull it out the rest of the way.

EDIT: Be sure any o-ring you use is immune to the effects of ethanol fuels. The job is such a PITA I'd say spend the money for a rebuild kit so you only have to do it once. :wink:


Thanks for the info. Yes, familiar with the effects of alcohol on rubber fuel system parts. I think I can get Viton in the right size locally, so that should be just fine. Also needs to be immune to oil, so it's a double whammy.


If a seal is OK with gas having ethanol, the oil won't be a problem for it.

If you don't find the Viton seals locally, try McMaster-Carr (mcmaster.com). McMaster has almost any industrial component you can imagine. They are not the cheapest but they do have a HUGE inventory of supplies.


Senior Member
Hey bfitz, is this for your Jensen? If so, yes it's the rounded profile. I did it on mine a few years ago.


Staff member
Country flag
BTW not sure if I have offered this before or not but, I do have the Haynes ZS carb book in PDF. PM me your address and I will be happy to send it on.


Great Pumpkin - R.I.P
On the Stag ZS carbs, I was able to tap out the adjusting screw using an unsharpened wooden pencil for a drift. Stuck the wooden end in the hole, then rapped the eraser end on the bench. Walked right out. I used round replacements in Buna-N as that's what I had on hand.
Similar threads
Thread starter Title Forum Replies Date
T TR6 My '74 TR6 Zenith Stromberg Carbs Float Bowls Leaking Gas Triumph 11
T TR6 Carb Vacuum Port- TR6 Zenith-Stromberg Carbs Triumph 2
Merlin63Tr4 TR4/4A Cracked Zenith-Stromberg float assemblies Triumph 13
Zimmycobra TR4/4A Zenith Stromberg questions Triumph 13
L zenith-stromberg carbs Lotus 11
Airfix Wedge TR8 Zenith Stromberg carbs slow deceleration Triumph 1
W Zenith stromberg carbs Jaguar 3
R Zenith Stromberg CD 175 float replacements? Triumph 3
eschneider TR4/4A TR4 Zenith-Stromberg CD175 tuning question Triumph 4
M zenith stromberg? Triumph 1
martx-5 Zenith Stromberg Carbs Triumph 4
M zenith stromberg 175 cd Triumph 24
M zenith stromberg 175cd Triumph 0
M zenith stromberg 175 cd. Triumph 7
R Zenith Stromberg Running Lean - Up-date MG 1
R Zenith Stromberg Running Lean MG 7
glemon "Fixing" Zenith Stromberg Emission Control Carbs MG 4
I Zenith stromberg metering needle removal help Triumph 9
I zenith stromberg float brass plug removal help Triumph 14
I TR6 69 TR6 Zenith Stromberg carb help Triumph 1
J Zenith Stromberg question MG 4
C MGB 1979 MGB Zenith Stromberg Carburetor MG 3
H Zenith Stromberg CD 175 Too rich Triumph 7
Bret Yet another Zenith Stromberg replacement choice MG 6
S Zenith Stromberg Mixture Adjuster Restoration & Tools 13
G TR6 Zenith Stromberg [1973 TR6] help Triumph 5
sparkydave Fixing Zenith-Stromberg needle adjuster Spridgets 5
bluemiata90 zenith stromberg cold start adjustment Triumph 5
John75 Intro and Zenith Stromberg question Triumph 8
A Zenith-Stromberg tuning & parts MG 20
77_MG_Midget Zenith Stromberg Carbs Spridgets 6
R Zenith Stromberg basic adjustment Triumph 1
7 Zenith Stromberg Question??? Triumph 6
7 Rebuilding Zenith Stromberg MG 6
Bret Zenith Stromberg 175CD vs. SU HIF44? MG 13
doc50 For Sale Zenith carb, fits many cars. Other British Classifieds 0
sparkydave Zenith auto choke coming loose Spridgets 2
C TR6 Zenith Strombers won't start when warm. Triumph 2
sparkydave Zenith auto choke coming loose Spridgets 3
A Zenith 175 CD's Triumph 19
A Zenith 175CD carbs Triumph 9
CZ_Dave Zenith Carb MG 13
B Question- Spridget & MGB Zenith flanges? Spridgets 2
Ofcalipka Zenith single carb problems MG 62
2wrench Anybody running a BP270 cam with Zenith carbs? Triumph 2
H conversion from Zenith to SU Triumph 5
M zenith float adjustment 1979 MG 1
jerrybny Front Zenith carb overflowing Triumph 20
mgbmedic Single Zenith Carb- Results MG 1
mgbmedic Single zenith carb is a joke... MG 19

Similar threads