Fuel Pumps

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Re: Fuel Pumps

Postby JohnC » Fri Jul 06, 2018 4:58 pm

mike17 wrote:.But however I adjust the idle screw she dies on me

Mike ....... Glad to hear you are getting somewhere with it now ........... can I ask which screw are you referring to, as there are two adjusting screws that have to be adjusted to set the revs at idle.
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Re: Fuel Pumps

Postby mike17 » Fri Jul 06, 2018 5:16 pm

Hi John, only knew about one..
I've been adjusting (from x3 turns) out the bigger screw with the visable spring..but doesn't seem to have much effect...on the revs..is there another one on the same carb...I known the one just below and forward is the mixture screw (usually covered with a plastic plug)
Haven't played with that yet.
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Re: Fuel Pumps

Postby JohnC » Fri Jul 06, 2018 7:05 pm

OK ....... so you know about the larger screw adjuster and the smaller one for mixture adjustment.
With regard to the larger screw ...... that is to set the revs, but turn an eighth of a turn at a time and pause each time as it takes a few seconds for any adjustment to take effect with carburettors.
From memory, I think screwing it in reduces the revs and out to increase the revs.
The trick is to run the engine till it is at normal operating temperature ...... immobilise the Accelerated Idle by removing one of the connectors from the solenoid valve RHS of the engine ( it has vacuum pipes attached to it ) ..... set the revs at around 1000 with the larger adjuster, then adjust the mixture screw (small one) incrementally pausing between adjustments for the engine to settle.
You have to try screwing in and out ...... but you will be guided by the change of revs each time you make an adjustment.
If the revs start to climb, keep adjusting the Rev adjuster to maintain 1000 revs ...... should the revs fall while adjusting the mixture, then stop and adjust the other way ...... what you are looking for is to peak the revs with the mixture adjuster while keeping the revs at 1000.
Once you have found that point, you can lower the revs to around 850 to 900 revs.
You cannot go much further with that adjustment without an exhaust gas analyser ...... but my method should be good enough to get you going.
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Re: Fuel Pumps

Postby mike17 » Fri Jul 06, 2018 9:43 pm

Thanks John...its a big learning curve for me...I spent the first years of ownership scared of adjusting or playing with anything on the carbs...on the old adage if its not broke don't ...
I've got a Renault workshop manual that cost me a few boxes of cigars
to get when Bath Renault Performance garage closed down..I think there were only 6 performance alpine ones in UK.
but its a bit vague about the carbs set up..well to me anyhow..
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Re: Fuel Pumps

Postby mike17 » Fri Jul 06, 2018 9:53 pm

PS - should the main carb butterflies move when reving them engine manually when up to temp and thermostat has opened..a daft question as ..yes..but for some reason my main carb seems stuck...page B-33
Says - under 35 Ceei last para..
- the throttle butterflies of the dual barrel carb (N) should follow the movement of link (11)...mine don't as far as I can see...I think the French to English translation was a bit random in the 80's..haa
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Re: Fuel Pumps

Postby JohnC » Sat Jul 07, 2018 7:32 am

mike17 wrote:PS - should the main carb butterflies move when reving them engine manually

No ....... you will not be able to see the twin butterflies to move by revving the engine when stationary.

Says - under 35 Ceei last para..
- the throttle butterflies of the dual barrel carb (N) should follow the movement of link (11)...mine don't as far as I can see..

That is right ....... the butterflies are operated by vacuum but will only open to the degree of the position of how much acceleration you are applying to the throttle pedal.
You will notice that link 11 is attached to the underside of the throttle wheel ....... therefore if the wheel is in half throttle position, the twin butterflies will only be able to open to half throttle. The wheel acts as a stop for the vacuum operated butterflies ....... if there was no stop, the butterflies would open fully once you come off idle.
I hope this makes sense to you.

PS. For bedtime reading, as you have a W/S manual, pages B-30 & B-31 is worth reading & absorbing. ;)
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Re: Fuel Pumps

Postby mike17 » Sat Jul 07, 2018 1:56 pm

Hi John just saw your reply..thanks..I took the main carb off this morning to give it a clean up & oil, and to check nothing was jaming....I wish I'd kept my mecano set...u need the spanners in it...getting all the linkages apart is bit of a game..but...after putting g it all back together I think she's running even better...thing is I can't really remember what the engine sounded like as it was so long ago...getting there slowly..
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