DHLA 45 P as received for repair and restoration.Seized idle mixture screws and non functioning
The other one.
DHLA 45 P. Lotus application. Post restoration and repair (seized idle miixture screw)
The other body: DHLA 45 P
The pair
Again
Clean inside and out: replated fixings and assembled with anti seize paste
Same set: note choke rod bush that was machined for the job (not available as a Dellorto spare part).
Concours set of early Webers
Concours DHLA's , manifolds etc
Doen't get much better that this!!
Pair of 40 DHLA's from a Imp engined competition Ginetta. In for CC service after a long layup, this necessitated milling out seized components before the comprehensive cleaning and overhaul process could start..
Same Ginetta carburettors. JRS: an engineering approach to carburettor cleaning and overhaul - no acids used here - just ultrasonics.
Lotus Elan: 40DHLA's for overhaul and restoration.
Same carburettors.
Work completed. As well as the usual work schedules, grainy throttle shaft operation necessitates further inspection. The result, a deformed shaft and worn bearings. All replaced.
Another pic of the same carburettors, showing replaced shaft and bearings. JRS: an engineering approach to carburettor services - tested quality.
Mk 2 Lotus Cortina 40 DCOE cartburettors, as received. Again for overhaul and restoration.
Work completed. JRS: tested quality.
Same pair as previous pic.
Four DCNF's from an Aston Martin, at JRS for CO. Work is complete. Faults galore but all should be resolved now. Weber supplied 3 DCNF variants to AML and it is ........
...of critical importance that the type is identified and the build and set up specification is correct for that type. To make things a little more difficult, customer had partially drilled out gallery plugs on one body in an attempt to find the reason for poor/impossible engine idle. Shaft bearings were very grainy indeed. These had been overhauled earlier in their life, but scant attention was paid to many of the awkward bits and pieces, all of which need to be completed if the work is to live up to the description of a Comprehensive Overhaul. This is hours and hours of work and simply best left to people who know what they are doing and who inclined to do the work properly. JRS trusted, tested service.
As received, a pair of DHLA's from an Elan Sprint: at JRS for assessment. Customer had been advised by a marque "expert" that the carburettors might well be worn out and should be replaced by a set of new Webers!!
The RH unit of the pair. Assessment complete and assembly sound, carrying no terminal issues at all. Comprehensive overhaul commenced.
In this case, wrong components were fitted, both with regard to size and type, float heights were hopeless and the pump assembly on one unit was not functional. Comprehensive overhaul undertaken ,float valves and pump diaphrams replaced and all issues resolved. JRS : an engineering approach to carburettor overhaul.
Same set.
48DHLA's and manifolds from a 1980 2.3 HSR Chevette, at JRS for restoration.
Problems included seized idle mixture screws (not uncommon !!!).
Original Magard.
Full overhaul and restoration complete. Fully operational and all problems resolved. New idle screws fitted afer milling out damaged originals. Pumps calibrated and completed assembly fuel tested. JRS - tested quality.
Manifolds re engineered to compliment the carburettors and ......
a Magard never looked better!!
Older 40 DHLA Dellortos from a 2litre Alfa Romeo, at JRS for restoration.
Split float posts on on cover damaged, so TIG work work required to remedy this fault.
The TIG ed and rebuilt split float post. Not the prettiest thing you ever saw, but it's properly aligned, more substantial than the original and does the job perfectly. This cover was useless without the repair:-damage usually caused by drifting out the float pin in the wrong direction. Always check float post condition before sending carburettors away for work!!!!
Not functional and not very pretty either. Work is proceeding...........
Complete
In addition to the usual restoration service, this set needed the float post repair referred to earlier and a repaired pump operating rod.
Restored carburettors looking very much better. Shine is freshly applied ACF fluid, used to preserve finishes. This will dry off to a matt sheen.
Pumps recalibrated to 9cc/20. All tested and returned by insured carrier. JRS: tested quality.
45 DCOE for an MGB.
More DHLA's from a 1969 Elan FHC SE. At JRS for a comprehensive overhaul.
These have been worked on before by an "acid dipper". Acid cleaning has left the usual matt finish. Washers are missing, shaft bearings are very grainy.
You can see the corrosion in the lower cover screw. All 6 of these had been replated ( but no linishing or polishing in preparation). Every other item had been ignored and left in place. Consequence is that shaft components are rusted solid, as are pump, pump covercover and aux, venturi screws. No wonder the bearings are noisy and rough. Yet another example of where half a job, is probably worse than no job at all. Now complete.......
.... after a LOT of work. These "soldered" main jets were replaced, the "grainy" shaft bearings turned out to be Weber open type and required replacement with correct type bearings, as did one shaft. Pumps were hopeless as were many other parts. CO completed, pumps correctly calibrated and each unit tested. Altogether a lot more work than should be required to complete a CO on a pair of DHLA's. JRS - tested quality.
Completed work.
Weber 36 IDF's at JRS for CO.
CO complete and fuel tested.
Yet more 48mm DHLA's and again from a 2.3 Chevette. Dellortos at JRS for CO and PR and the manifolds for re-engineering.
Work completed. CO and PR with manifolds re engineered to compliment the carburettors. Work sprayed with ACF preservative. Internally and externally, as good as you will find. Accurate pump recalibration and fuel tested before return by insured carrier. All this is included in the price. JRS - tested quality workmanship.
More DHLA's this time 45's from a 1983 2.2 Sunbeam Lotus S2, at JRS for CO. Initial view, as delivered.
Initial external inspection shows these, which do not look promising!! The other body is much the same.
Undersides, mucky but sound. Work is soaked in release fluids, bagged and then goes on the shelf to await its' turn.The images in this Gallery just show a few examples of work received at JRS and the various levels of service offered. It's all completed with care and to a stated, tested standard and this is generally not found elsewhere. The JRS difference is that JRS overhaul and restore carburettors and we do not do anything else. It is all that we do.. Contrast this with others who rarely state proceedures etc and for whom overhaul work is a sideline and restoration work, a rarity. Check the facts for yourself.
Initial concerns prove well founded - these idle screws are locked solid. Carburettors are useless unless this problem is resolved. A mistake duing this process can also render carburettors useless........
... but here we are with the removal work completed. The original problems are caused by dirt, debris and water getting into the top of idle mixture screw tower and from there down onto the threads in the body and the screw. If this happens, problems will arise very quickly indeed. Tackling the removal of these screws without the correct equipment is simply asking for trouble- a few mm's out and a carburettor can be ruined. It is an engineering task!! Why take any chances?
After a couple of hours or so on the Bridgeport mill, this is what's left of the 2 idle mixture screws. The shafts and tapered ends are untouched, the springs and washers are also untouched. The remains of the threaded heads are shown, the rest is simply metal swarf on the machine bed. This was the worst I have had to deal with so far. Chase the threads with the appropriate taps and job done. JRS - an ENGINEERING approach to carburettor overhaul and restoration.
and here is the completed work. Full manufacturer's rebuild kits used, floats accurately set, pump volumes calibrated to manufacturers recommended figures, idle screws backed off 3 full turns as a notional start setting and their towers sealed with tight fitting removeable and reuseable silicon sleeves.
CO concentrates on technical overhaul and internally, these are very clean. No acids or aggresive chemicals, just ultrasonics, care and attention. Years of experience helps!!
More of the same.
Comparing the instruments as received and as above, the CO level of service also improves the external appearance. Tested, repacked and returned by insured carrier with correspondence confirming the work completed. JRS - tested quality workmanship and service.
Yes, more 48mm Dellortos and again from a 2.3 Chevette.
With short manifolds, Magard and some dire inter-carburettor links.
Finished work. JRS - an engineering approach to carburettor restoration
Same set: Magard assembly looks superb. Operationally these are as good as they can be. Visually - judge for yourself. JRS - the firm that you can trust to complete your overhaul or restoration properly. Why take a chance?
40 DHLA's from an Alfetta GTV at JRS for CO. Nice original fitment units but............
......... the usual problems!! So, its Bridgeport time again for this..............
.and this. When you think everything has been discovered, then...........
.......this !!! Now, what is this all about?
The ultrasonic cleaning element of the CO complete and remains of idle screws: springs and washers intact, screw ends shown and the rest is on the Bridgeport bed.
CO complete. Shaft bearings were very grainy but cleaning, relubricating etc will give them a new lease of life. Silicon caps will seal off the idle towers. Floats set properly and pumps recalibrated to approved figures for this application. JRS: tested engineering approach to carburettor overhaul.
JRS: tested quality service and workmanship.
42 DCNF at JRS after CO. These butterflies and bores carried heavy carbon deposits, probably sufficient to prevent the proper operation of the carburettor.
Here are the idle, progression holes and cold start drillings. This is one of four 1970's carburettors .
Pair of 40 DHLA's in for CO. these were an Ebay purchase from someone who stated that they were "freshly serviced and ready for use". These are non emission 4 progression hole (ex AR) instruments. Apart from the fact that the internal build was a country mile from what my customer wanted, the throttle spindles were bent and the bearings heavily corroded. After a lot of work and expense...
...this is the result. Useless shafts and bearings in the foreground and all of the original parts not required in the bag on the LHS. These carburettors had been acid cleaned at some time and not very well at that. This is probably what did for the bearings. The bent shafts? Who knows..probably uninformed maintenance.
Just as a word of warning, new spindles cost £35 each, so, with bearings and butterfly screws, this is a heavy spend. Fitting is not included in the charge for a CO, so there is an additional labour chaarge as well. Ebay purchases???? Caveat emptor or buyer beware!!!!!
Pair of Webers from a Lotus Elan SE. Except they are not - the carburettors are a Weber model made for the Rootes Group for one of their Holbay developed cars - the numbers and other features tell me that. So, how to convert to use on the Elan? Carburettors at JRS for CO and modifications.
Work finished - here is one of the pair. As well as a Comprehensive Overhaul, modifications to the bodies and changes to other components have been made. Customer feedback is awaited with interest.
A pair of 45mm Dellortos from a Lotus Eclat, at JRS for CO.
Work complete, pumps re-calibrated, floats reset. New Dellorto build kits, including float valve assembly and pump diaphrams included in the price, as is insured return carriage. JRS - tested engineered approach to carburettor overhaul or restoration.
Another pair of 40 DHLA's in for overhaul. Included in the JRS charge of £280 for this work is the cost of the Dellorto overhaul kit shown which retails at £60 or so and insured return carriage, a further £22. As you can see, the kit includes pump diaphrams and float valve assemblies. When comparing costs and service, make sure you are comparing like with like. JRS - an engineering approach to carburettor overhaul and restoration.
Butterflies have been removed, throats have been thoroughly cleaned, bearings inspected and new butterfly screws and shaft nuts fitted.
The finished job. This is a Comprehensive Overhaul and no restoration services were requested. Still, huge improvment, visually and operationally, as good as you will get.
Here are all of the other refinished components after ultrasonics and re-engineering, awaiting the return of the steelwork from the platers.
Finished pair.
Close up of one of the pair.
Undersides just as good. Just a note; the original Dellorto shaft bearings were rubber sealed and as such waterproof. The replacements fitted to these were shielded bearings and NOT waterproof - thus grainy and internally corroded. Modern waterproof bearings are refitted by JRS. To do so, shafts have to be extracted and butterflies removed - check the previous pics for new shaft screws, installed with blue Loctite. JRS an engineering approach to carburettor overhaul and restoration.
