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#47595 - 06/03/06 10:16 am Lucas 18D2 distributor  
Joined: Jun 2006
Posts: 804
andrewinpopayan Offline
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andrewinpopayan  Offline
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Halifax, Butt end of Europe
Has anyone ever pulled one of these down to the bones? The one on my 1959 350cc 3TA hack has a bit of side to side slop and I wondered what sort of bearings were inside, my guess is its a couple of p/bronze sleeves but I would like to find out for sure, so if anyone has had one apart or knows of drawings please let me know

Andrew


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
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#47596 - 06/05/06 9:05 pm Re: Lucas 18D2 distributor  
Joined: Aug 2001
Posts: 6,666
Jon W. Whitley Online content
Jon W. Whitley  Online Content



Joined: Aug 2001
Posts: 6,666
Vermont
andrewinpopayan

The bushing on the drive end of the shaft appears to be of the bronze type.

beerchug


Jon W.


1957 6T Thunderbird 650
1971 TR6R Tiger 650
1955 Tiger 100 - Project
1970 BSA A65F 650 - Project

#47597 - 06/06/06 4:57 pm Re: Lucas 18D2 distributor  
Joined: Oct 2003
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RF Whatley Offline
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RF Whatley  Offline
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Posts: 11,108
North Georgia, USA
Jon is correct. The bushing is a plain one, and after installation should be reamed to the shaft size plus .001". Assemble with motor oil. While you have it chucked up in your lathe, you can also cut a groove for an oil seal under the AAU.

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#47598 - 06/06/06 5:40 pm Re: Lucas 18D2 distributor  
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andrewinpopayan Offline
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Posts: 804
Halifax, Butt end of Europe
Is the original bush pegged or is it just a press fit?


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47599 - 06/06/06 5:59 pm Re: Lucas 18D2 distributor  
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Posts: 315
cycarmark Offline
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cycarmark  Offline
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florida
The one in the 18D2 dizzy on my '59 3TA was a press fit.

#47600 - 06/06/06 6:13 pm Re: Lucas 18D2 distributor  
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andrewinpopayan Offline
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andrewinpopayan  Offline
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Halifax, Butt end of Europe
Thanks cycarmark, so it a long-ish p/bronze sleeve, press fitted into the body. I assume that the roll pin comes out of the drive gear, the drive gear can then be pulled off the shaft and the shaft withdrawn out of the body. Is there a retaining circlip at the bottom end of the bearing? I havent pulled mine to pieces yet its still on the bike (which runs well enough) its a "to-do" in the future.
I have a new oil pump coming in the post because I don't know hold old/worn the original is, maybe its been running around on the same one for almost 50 years?


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47601 - 06/06/06 7:16 pm Re: Lucas 18D2 distributor  
Joined: Jun 2006
Posts: 804
andrewinpopayan Offline
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andrewinpopayan  Offline
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Halifax, Butt end of Europe
AHA! located one, described as "oilite" bush, 18D2 also fitted to dozens of different machines, price 2.95 ($5)


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47602 - 06/07/06 12:52 am Re: Lucas 18D2 distributor  
Joined: Sep 2004
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EWebster Offline
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EWebster  Offline
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Okay, I will ask. What is with the "sworn enemy" of Joseph Lucas thing?

#47603 - 06/07/06 4:51 pm Re: Lucas 18D2 distributor  
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Posts: 804
andrewinpopayan Offline
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andrewinpopayan  Offline
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Halifax, Butt end of Europe
For the last 30+ years I have done battle with his devilish devices. Betweem themselves Mr Lucas, Darth Vader and "Brain" want to plunge the universe into eternal darkness.
My first battle was with one of his dynamo control boxes on my Panther, this was years before electronic controllers, anyway a bit of prodding around with my multimeter found the 0.3 ohm field resistor was open circuit (the black button looking thingy) rivetted to the main body, replaced it with a 10 watt wirewound---no further problems.
Second battle was an RM15 alternator on a C15, vibration had caused some coils to go short to the alternator chassis, so out came the silk covered enameled copper wire, 2 hours later a rewound better-than-new alternator, chucked his ?selenium? rectifier, fitted a butch silicon bridge rectifier and for good measure fitted a home-made voltage regulator and went 12 volt. I also fitted a sealed beam headlight unit of a "Mini", the 12 volt coil and a "Sparkrite" electronic ignition unit that still used the point, the coil was more like a Tesla coil smile .
Over the years I have worked on numerous brit bikes, almost always on the electrics.


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47604 - 06/07/06 4:55 pm Re: Lucas 18D2 distributor  
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andrewinpopayan Offline
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Halifax, Butt end of Europe
Part number for the bush is 70-4190, I also ordered a new inlet camshaft nut because it has the peg that drives the oil pump part number 70-1463, barring other problems they should see it good for the next 50 years


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47605 - 06/07/06 5:01 pm Re: Lucas 18D2 distributor  
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cycarmark Offline
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cycarmark  Offline
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florida
Actually I kinda like Lucas stuff. My first bike was a 165 Harley with a "crankshaft mounted, six pole, shunt wound generator" that made the Lucas stuff look easy! (that is until I got my 3TA with the combined lighting and ignition switch).

#47606 - 06/07/06 5:46 pm Re: Lucas 18D2 distributor  
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andrewinpopayan Offline
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Halifax, Butt end of Europe
My "Tronda" 3TA trophy trials was 12 volt when I got it, its using a 6 volt alternator wired as a 12 volt to a Boyer "powerbox" and I just fitted a 15000uF to even out the sparks at low revs with the lights on. Its still got the standard 18D2 with rotor arm, cap, copper cables and non supressed plugcaps. It all works well, IF I did ever get a distrib cap problem, I would probably fit a twin spark "foriegn" coil. I have cured all major oil leaks by fitting home-made gaskets, I bought some sheets of "alite" in different thickneses, made some copper washers and done various fine tune "tweaks". Is an around town hack, if I get chance I will post a foto. Next job is the seat, I am looking for some leopard/tiger skin colored "Rexine" and gonna carve a block of sponge with the wirecutter I use to make model aircraft wing cores.


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47607 - 06/07/06 5:54 pm Re: Lucas 18D2 distributor  
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cycarmark Offline
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florida
Mine is stock, except last year I fitted the Newtronic ignition system. It replaces the points with an optical sensor (keeps the old advance unit) and uses a dual output coil. It works great, and if I ever want to go back to points, I can. The original Lucas points lasted around 25,000 miles, but the reproduction points did not seem to last as long. I also fitted the MAP oil filter.

#47608 - 06/07/06 6:14 pm Re: Lucas 18D2 distributor  
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andrewinpopayan Offline
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andrewinpopayan  Offline
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Posts: 804
Halifax, Butt end of Europe
[img] [url=file:///home/andrewinpopayan/Desktop/imag0012.jpg]file:///home/andrewinpopayan/Desktop/imag0012.jpg[/url] [/img]


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47609 - 06/07/06 6:16 pm Re: Lucas 18D2 distributor  
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Posts: 804
andrewinpopayan Offline
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andrewinpopayan  Offline
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Posts: 804
Halifax, Butt end of Europe
mad damn computer is in league with Lucas


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47610 - 06/07/06 6:23 pm Re: Lucas 18D2 distributor  
Joined: May 2005
Posts: 3,753
shel Online content
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shel  Online Content
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ohio
Andrew, you can't post photos from your computer, you have to upload to a photo host first like www.photobucket.com and then post them here using the [img] tags just as you've done or click the image icon below the reply box


When given the choice between two evils I picked the one I haven't tried before
#47611 - 06/07/06 9:10 pm Re: Lucas 18D2 distributor  
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andrewinpopayan Offline
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Posts: 804
Halifax, Butt end of Europe
hmm, I'll leave that until later. Does your 3TA run hot, like can you fry eggs on it or have I forgotten how hot aircooled get?


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47612 - 06/07/06 9:15 pm Re: Lucas 18D2 distributor  
Joined: Jun 2006
Posts: 804
andrewinpopayan Offline
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Halifax, Butt end of Europe
I cleaned out the pressure release valve and fitted the new pump, the old one doesnt appear worn, no crud under the ball seats etc, wish it had a pressure guage tapping for a switch or guage so I can be sure the bearings are getting lubed. good squirt of oil coming back into the tank on fast tickover


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47613 - 06/07/06 9:25 pm Re: Lucas 18D2 distributor  
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andrewinpopayan Offline
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Posts: 804
Halifax, Butt end of Europe





That might do it


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47614 - 06/07/06 9:27 pm Re: Lucas 18D2 distributor  
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Posts: 804
andrewinpopayan Offline
BritBike Forum member
andrewinpopayan  Offline
BritBike Forum member

Joined: Jun 2006
Posts: 804
Halifax, Butt end of Europe


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
#47615 - 06/11/06 4:42 pm Re: Lucas 18D2 distributor  
Joined: Jun 2006
Posts: 804
andrewinpopayan Offline
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andrewinpopayan  Offline
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Halifax, Butt end of Europe
Anyone that needs a bearing, the size to buy is 16mm O/D 12mm I/D and 25mm long, a reference to a supplier would be QM21-25 for an oilite bush, but you will need access to a small lathe to "adjust" to fit. Mine ended up as 15.88mm O/D 12.42mm I/D and 24mm long made from a "Glacier Oilite" blank and soaked in EP80 @100C for 3 hours. I got the body hot in the oven to "oilsmoke" teperature and fitted the bearing straight from the freezer @ -25C a reasonble tight press fit with a valve spring compressor and the shaft lapped to fit with "Brasso" polish, my lathe is too small to carry the distributor body


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead

Moderated by  Alan_nc 


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