The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Carb Maintenance
PostPosted: Wed May 20, 2015 5:50 pm 
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Location: Coventry
Been Tinkering a bit this afternoon and noticed the carb chamber needed a bit of oil both sides, Haynes manual says top up to filler line but as far as I can see there is no filler line? Also is there any maintenance needed for the float chambers as doesn't mention this in the manual?
Cheers Rich..

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1981 Dolomite 1500 Auto


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 Post subject: Re: Carb Maintenance
PostPosted: Thu May 28, 2015 8:02 am 
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Joined: Tue Oct 03, 2006 5:52 pm
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Location: Halifax, West Yorkshire
Just top up the dashpot to the top of the piston that the plunger goes into. It doesn't matter too much if you put a bit too much in because the screw cap has a smale hole so any excess will be forced out when the piston goes up. My recommendation is to use ATF but any oil that is thinner than engine oil will do. One of my Club Triumph friends used a mix of 20W50 engine oil and 3-in-1 type oil in his racing Spitfire in his dashpots (he was running the 1500 lump with the SU HS4s at the time). The reason for using a thinner oil is to improve response when the piston moves up when the throttle is opened.

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Toledo Man

West Yorkshire Area Organiser & forum moderator
Meetings take place on the first Wednesday of the month at 8.00pm at The Old Brickworks, Wakefield Road, Drighlington, Bradford, BD11 1EA

1972 Dolomite 1850 auto (NYE 751L - Now for sale)
2003 Volvo XC90 D5 SE (PX53 OVZ - The daily driver)
2009 Mercedes-Benz W204 C200 CDI Sport (BJ58 NCV - The 2nd car)
1991 Toyota Celica GT (J481 ONB - another project car)
Former stable of SAY 414M (1974 Toledo), GRH 244D (1966 1300fwd), CDB 324L (1973 1500fwd), GGN 573J (1971 1500fwd), DCP 625S (1977 Dolomite 1300) & LCG 367N (1975 Dolomite Sprint) plus 5 Acclaims and that's just the Triumphs!

Check my blog at http://triumphtoledo.blogspot.com
My YouTube Channel with a bit of Dolomite content.

"There is only one way to avoid criticsm: Do nothing, say nothing and BE nothing." Aristotle


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 Post subject: Re: Carb Maintenance
PostPosted: Thu May 28, 2015 2:42 pm 
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Joined: Tue Mar 17, 2015 5:12 pm
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Location: Coventry
Have topped the oil up in the pots, but wondered if there was any maintenance needed for the other chamber / float pots?
Cheers Rich..


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 Post subject: Re: Carb Maintenance
PostPosted: Sun Jun 07, 2015 10:34 pm 
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If the car is running fine then you don't have to do anything else.

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Toledo Man

West Yorkshire Area Organiser & forum moderator
Meetings take place on the first Wednesday of the month at 8.00pm at The Old Brickworks, Wakefield Road, Drighlington, Bradford, BD11 1EA

1972 Dolomite 1850 auto (NYE 751L - Now for sale)
2003 Volvo XC90 D5 SE (PX53 OVZ - The daily driver)
2009 Mercedes-Benz W204 C200 CDI Sport (BJ58 NCV - The 2nd car)
1991 Toyota Celica GT (J481 ONB - another project car)
Former stable of SAY 414M (1974 Toledo), GRH 244D (1966 1300fwd), CDB 324L (1973 1500fwd), GGN 573J (1971 1500fwd), DCP 625S (1977 Dolomite 1300) & LCG 367N (1975 Dolomite Sprint) plus 5 Acclaims and that's just the Triumphs!

Check my blog at http://triumphtoledo.blogspot.com
My YouTube Channel with a bit of Dolomite content.

"There is only one way to avoid criticsm: Do nothing, say nothing and BE nothing." Aristotle


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 Post subject: Re: Carb Maintenance
PostPosted: Mon Jun 08, 2015 7:49 am 
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Joined: Tue Mar 17, 2015 5:12 pm
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Location: Coventry
Ok great , 1000 miles since I got her and running fine.
Cheers Rich..

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1981 Dolomite 1500 Auto


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 Post subject: Re: Carb Maintenance
PostPosted: Fri Jun 19, 2015 8:29 am 
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Joined: Sun Oct 26, 2008 7:26 am
Posts: 2473
I would say use engine oil.
Too thin an oil lets the piston rise too quickly, which means there is less enrichment during acceleration (SU carbs are more complicated than they look. When you accelerate the piston moves down, this gives more vacuum over the jet and enrichens the mixture. The fact the needle gives a weaker mixture with the lower piston is trumped by the vacuum)

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Clive Senior
Brighton


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 Post subject: Re: Carb Maintenance
PostPosted: Fri Jun 19, 2015 10:16 am 
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Joined: Mon Nov 07, 2011 9:57 am
Posts: 713
Location: Dorset
I tended to use whatever was nearest. I've used ATF, 3in1, 20w50... There probably is a small difference but it's nothing that I noticed/concerned me. I can tell you that "bugger, forgot to put oil in the dashpots" is quite noticeable though ;)

Steve


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