The Triumph Dolomite Club - Discussion Forum

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 Post subject: Carb Maintenance
PostPosted: Wed May 20, 2015 4:50 pm 
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Posts: 251
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

1971 Toledo 4 door


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 Post subject: Re: Carb Maintenance
PostPosted: Thu May 28, 2015 7:02 am 
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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 1st Wednesday of every month at The Hollies Sports & Social Club, 12 Hough Lane, Bramley, Leeds, LS13 3NE
1972 Dolomite 1850 auto (NYE 751L - The rolling restoration)
2008 Citroën C4 Grand Picasso 2.0 HDi Exclusive (MA08 WCL - the modern)
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

"I can help you stop smoking in bed. Buy a water bed and fill it with petrol." - Bob Monkhouse OBE (1928-2003)


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 Post subject: Re: Carb Maintenance
PostPosted: Thu May 28, 2015 1:42 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 9:34 pm 
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Location: Halifax, West Yorkshire
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 1st Wednesday of every month at The Hollies Sports & Social Club, 12 Hough Lane, Bramley, Leeds, LS13 3NE
1972 Dolomite 1850 auto (NYE 751L - The rolling restoration)
2008 Citroën C4 Grand Picasso 2.0 HDi Exclusive (MA08 WCL - the modern)
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

"I can help you stop smoking in bed. Buy a water bed and fill it with petrol." - Bob Monkhouse OBE (1928-2003)


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 Post subject: Re: Carb Maintenance
PostPosted: Mon Jun 08, 2015 6:49 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

1971 Toledo 4 door


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 Post subject: Re: Carb Maintenance
PostPosted: Fri Jun 19, 2015 7:29 am 
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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
Driving Toledo fitted with slant 4, sprint OD box and axle. Needs fettling!


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 Post subject: Re: Carb Maintenance
PostPosted: Fri Jun 19, 2015 9:16 am 
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Joined: Mon Nov 07, 2011 9:57 am
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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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1978 Triumph Dolomite MX-5 Build (Project) viewtopic.php?f=19&t=29239
1959 Morris Oxford IV Traveller in Red/Cream (Daily)


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