Recent Posts

Pages: « 1 2 3 4 5 6 7 8 9 10 »
71
Thank you!
72
General Douglas Discussion / Re: RA on aussie fleabay
« Last post by Dave on 04 May 2024 at 19:47  »
It's going to be interesting to see the next move. The seller will be encouraged by the 60% increase in the final bids by what looks like, two new bidders.
73
Thanks for posting the above documents Steve.

Some cropped and rotated versions.

Douglas 1927 EW600






Douglas A29, D29, F29








Douglas 1927 Models



74
General Douglas Discussion / Re: Correct magneto for 1913 Douglas?
« Last post by Dave on 04 May 2024 at 18:02  »
75
General Douglas Discussion / Re: Douglas t6 tank pads
« Last post by Radzziu on 04 May 2024 at 14:02  »
If you are a member of the LDMCC, the tank rubbers can be obtained from the prewar spares scheme (item 40 in the spares list). The rubbers fit on steel plates that have a single bolt fixing to the side of the tank. I have attached a photo of the side of a T6 prior to restoration showing the single fixing for tank rubber.

  Regards,
               Eddie.
On this moment not available from the the club
76
General Douglas Discussion / Re: Douglas t6 tank pads
« Last post by eddie on 04 May 2024 at 13:41  »
If you are a member of the LDMCC, the tank rubbers can be obtained from the prewar spares scheme (item 40 in the spares list). The rubbers fit on steel plates that have a single bolt fixing to the side of the tank. I have attached a photo of the side of a T6 prior to restoration showing the single fixing for the tank rubber.

  Regards,
               Eddie.
77
General Douglas Discussion / Douglas t6 tank pads
« Last post by Radzziu on 04 May 2024 at 13:07  »
Hello everyone, my Douglas tank is under repair, and the tank pads were not original.
Does anyone have any photos of how the original pads are fitted to the fuel tank?
Also be good if somone have fuel tank foto without pads
Greetings from Scotland
78
General Douglas Discussion / Re: RA on aussie fleabay
« Last post by cardan on 04 May 2024 at 09:57  »
Unsold again, this time "$16,100" "reserve not met".
79
General Douglas Discussion / Re: Rare Pistons
« Last post by graham-xrfx on 04 May 2024 at 09:03  »
Here I am about to explore the more insane end of what folk might do to fix up an old Douglas engine. Given that we are now up the creek without the proverbial paddle, I have been giving some thought to possible ways forward. The pretty shocking price of replacements, about double what (Ron?) paid for his not so long ago, suggests JP Pistons simply do not want the work to make them, though at least they do have the casting. Arguably, for what I am about to propose, it could cost even more, but my time on these, and the machining facilities, and various folks expertise is free.

David (DJS) has offered a couple of T5 +0.030" pistons that look about right, differing only in the position of the oil control ring arrangement. My original pistons have a series of 8 holes immediately below the second ring slot, and then 12 more holes under a full oil control ring positioned 5mm from the bottom of the piston skirt. They also look like they have been through the wars, and as they are, are not really OK to use on a re-bore build. Thus we get to plan A. I know this will sound a bit extreme, and I am not sure the scheme is even viable, but it goes something like this..

1. Turn them down, removing 0.005" in general, using the correct taper-turn.

2. Dress the ring slots to be correct for the new diameter.

3. Selectively make the "oval, using strips of emery cloth, to relieve the skirts by the correct amount at 90° to the wrist pin axis.

4 Provide it with a new set of rings, gapped to suit the +0.020 bore.

About the only thing left is the question of the oil control ring being different.
(Yes - we can all see that only one piston has what is left of an oil control ring. The other seems to have a collection of any old thin rings that will fit)!
I was thinking to use the same kind of oil ring as fitted into the original skirt, but in the higher position.
There might need to be some kind of shim ring slot adjustment, or, if the oil ring slot is too narrow, then turn it out to fit.

I don't know how low the oil ring has to sweep to reach the point it can fetch oil up from the crankcase, normally through the little holes in the skirt behind the ring, but perhaps adding a little 2-stroke oil to the fuel can be precaution measure.

At least, in messing with these, we start with very little to lose if we mess up in the attempt.
Might there be folk in the forum who have attempted something like this?

Plan B
It seems that it is quite possible to weld on pistons, the better way being TIG. Also, the weld needs to be the right alloy, best found by using metal from old pistons. The notion is to start with a new set of +0.020 pistons, and "add" enough metal to the crown, then turn it into a hemisphere, mill the valve clearances to correspond to where the clearances already are, and then do some hand filing/shaping.

The first picture is of Davis's donor pistons.

The second picture is of my original set after the first (pre COVID era) stripdown, showing the broken first slot rings. They were a little scored, but seemed OK to put back into a standard bore which had been lightly honed to clean up.

The third picture is of a piston for that same rebuild,

The fourth picture is of the corrosion that led to the ring breakage first time around, and the stuck top ring failure this time, motivating the re-bore.

I completely accept that experts in this forum may well tell me this plan is somewhat dodgy, if not completely non-viable. It may be that I end up going where nobody else would, and that is OK. You can all see the ensuing  débâcle posted here!


80
General Douglas Discussion / Re: Correct magneto for 1913 Douglas?
« Last post by cardan on 04 May 2024 at 08:37  »
Here's a ZA2, ex Douglas going by the drive gear.

https://www.ebay.co.uk/itm/156182668036

Leon
Pages: « 1 2 3 4 5 6 7 8 9 10 »