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Assistance needed with Stromberg Carb.

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Assistance needed with Stromberg Carb. #1
rmouse Roger Mousley Salt Lake City, USA 1969 Triumph GT6+ (MkII) "Litte Blue"	Posted: August 02, 2011 10:48AM Registered: 1 year ago Posts: 59

I recently acquired a 1969 GT6 that has a 2.5 liter motor and Stromberg 175CD carbs, the carbs have two adjustment knobs on the bottom, can anyone tell me what each knob adjusts and a base setting for my car?
Images added for clarification
Thanks in advance

Edited 1 time(s). Last edit at 08/02/2011 12:35PM by rmouse.

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Re: Assistance needed with Stromberg Carb. #2
britsnspits Michael Stoliker Bethlehem, PA, USA 1976 Triumph Spitfire 1500 "The Phoenix" 1978 Triumph Spitfire 1500 "Lucky"	Posted: August 02, 2011 11:25AM Registered: 2 years ago Posts: 7,044

Roger,

You may want to repost this in the Spitfire GT6 forum. This forum is for old Triumphs that don't fit in other categories.

As to the adjuster on the bottom of the Stromberg carb, there isn't any. The slotted brass thing underneath is part of the main jet assembly that pokes through the bottom of the float bowl. There may be an idle air corrector screw on the side of the carb body, but all mixture adjustment is done with a special tool down through the top damper.

Mike

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Re: Assistance needed with Stromberg Carb. #3
rotoflex William Hooper 1972 Triumph GT6 - Mobile, AL, USA	Posted: August 31, 2011 08:54PM Registered: 1 year ago Posts: 10

Nice, those are the pre-CDSE Strombergs.

The adjusters on the bottom are for adjusting the mixture, via altering the position of the jet. Easier setup than the later emissions-compliant CDSE Strombergs, which adjusted with a tool inserted through the top of the dashpot.

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Re: Assistance needed with Stromberg Carb. #4
TR3driver Randall Y Los Angeles, USA	Posted: March 16, 2013 05:53PM Registered: 7 months ago Posts: 222

The bottommost hex (with the screwdriver slot in it) is the jet adjustment. Turning it in leans the mixture across the entire range (but is normally adjusted at idle).

The upper hex locks the jet bushing in place and shouldn't be touched unless you want to re-center the jet to the needle.

Here's a couple of pages I scanned from the manual. Sorry there isn't more, my scanner decided to quit.

https://docs.google.com/file/d/0B2H2NJt34OffRVo1MlNKRm9sUlU/edit?usp=sharing

Randall
56 TR3 TS13571L daily driver
71 Stag LE1473L awaiting engine rebuild
7? Stag awaiting gearbox rebuild

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