givemethebighammer
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| posted on 6/7/03 at 09:37 PM |
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b*gger, one of my Dellorto DHLA carbs...
Just when things were looking good
One of the carbs has a problem with the accelerator pump / jet (basically doesn't work !)
anyone know of a good website or book that tells you how to strip these things ?
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Sideways 2 Victory
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| posted on 6/7/03 at 11:18 PM |
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Hiya
I dont have any web links
But I have an exploded view diagram with labelled parts for dhla 40's if that would help?
ATB
Dave
www.nurburgring.org
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Peteff
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| posted on 7/7/03 at 09:28 AM |
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Chris Gibbons had them on his old engine.
He posted the supplier once but I can't remember it. Try contacting him.
yours, Pete.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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ChrisW
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| posted on 7/7/03 at 09:43 AM |
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I believe there is a Haynes book on the subject?
Chris
My gaff my rules
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Mix
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| posted on 7/7/03 at 11:29 AM |
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I have just checked the Haynes carburettor manual, it does not cover your carbs, (unless it refers to them by a different name). Sorry! but at least
you don't have to go to a bookshop to find out.
Mick
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timf
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| posted on 7/7/03 at 11:39 AM |
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veloce do a book by des hamill
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Dave Ashurst
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| posted on 7/7/03 at 12:01 PM |
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I have dismantled and reassembled my Weber DCOE's several times.. they are similar to your Dellortos
Dave Andrews site has some good free advice on set up of Dellortos DHLA's, though not an exploded diagram, nor stripping details.
Looking at that though, it strikes me how similar dellorto dhla's are to weber dcoe's.
http://members.aol.com/dvandrews/dellorto.htm
In that case if it's only one pump jet that's not working then the jet itself might be blocked (rather than a sticky accelerator pump
piston which would affect both the jets on one carb).
I guess you have tried removing the pumpjet cover screw, pulling the jet out and blasting both it and the hole it came out of with solvent. No
substitute for a full service bu might be worth a go in the meantime?
[Edited on 7/7/03 by Dave Ashurst]
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givemethebighammer
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| posted on 7/7/03 at 02:29 PM |
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Thanks, I would be very grateful for any diagrams etc. I think it is a sticky accelerator pump piston as neither of the jets works. I did think that I
might get them serviced but it was quite expensive. I have been warned off the pattern service kits and the genuine Dellorto ones are £49 per carb,
cleaning and fitting of the kits is £36 per hour and will need about 1.5 hours per carb.... If I can get a manual and do them myself I could save some
money and learn something at the same time.
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Dave Ashurst
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| posted on 7/7/03 at 06:44 PM |
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Hi Mr Bighammer
I found a dellorto 40 exploded view and instructions (in the RS1600 part of a MK1 Escort Mexico and RS models manual in case you happen to have one to
hand).
I thought I remembered seeing something on the bookshelf ! I'll copy and post it when I can. (Our scanner's not connected to this
computer at present so I'll try to do it tomorrow at work.)
Meanwhile have a look. The pump is under the body of the carb and can be removed from the outside. It's a diaphragm pump, not the weber
piston-type so there's a possibility of a damaged diaphragm needing replacement I guess. Presumably you'll find the pump lever leading to
the pump housing on the bottom of the carb.
It says here (and I guess the carb's upside-down at this point):
18 Loosen and remove the accelerator pump rod adjusting nuts.
Taking care to retain the pump rod spring and the spring retaining washer remove the accelerator pump cover fixing screws and lift off the cover
together with the diaphragm and diaphragm spring.
19 Loosen evenly the four pump body fixing screws and lift off the body taking care not to damage the rubber washer beneath it.
20 Remove the inlet valve complete with rubber O-ring from the pump body.
And that's all there is to it!
On my webers the inlet valve is a small brass screw with a slotted hole through the middle and a tiny captive bead or similar that allows free flow of
petrol one way only.
I imagine this one is similar. Clean and test it. If the valve is gummed open the pump would just push and pull fuel through it rather than force it
properly through the jets. If the carb has been exposed to high temperature (in a fuel fire for example) the plastic bead in the inlet valve can melt
and then you need a new valve (dont ask, I just know, OK?  ).
The pump jets are under the covers shown in the diagram on Dave Andrews site. The manual says:
13 Remove the pump jet plug (two per carb) and the pump jet noting the presence of two gaskets. One fibre washer on the plug and one O ring on the
jet.
regards
Dave
[Edited on 13/7/03 by Dave Ashurst]
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givemethebighammer
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| posted on 7/7/03 at 09:06 PM |
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thanks I shall look at it this weekend. Definately not been heat damaged, took the carbs off a running lotus elite, just rust and general muck in that
engine bay !!
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rayroni
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| posted on 8/7/03 at 11:52 AM |
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try:-
http://www.racecar.co.uk/dellorto/
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givemethebighammer
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| posted on 8/7/03 at 09:56 PM |
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thanks spoke to these people earlier in the week, prices for spares seem reasonable
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Dave Ashurst
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| posted on 10/7/03 at 11:58 AM |
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bighammer, i have photocopy, u have u2u
dave
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givemethebighammer
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| posted on 13/7/03 at 06:21 PM |
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thanks for the photocopy Dave , I am going to try and service them myself.
What can possibly go wrong ?????
Famous last words.............
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