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Douglas 1913 Model P motorcycle

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Douglas 1915 3 Spd-Gearbox and Clutch

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Lat Fuller

2025-07-20, 02:39:50
I am pretty desperate for a rear cylinder for my veteran Douglas 1917 2 3/4hp "W" model.   I there is anyone who may have one of these that can be re-sleeved or know where I may find one I would be very pleased for the help.  I have a number of engine parts that I can exchange such as matching crankcases, conrods, crankshaft, flywheel etc. Any help appreciated.

Lat Fuller

2025-06-04, 05:57:00
Does anyone have the specifications for the oil inlet valve spring for early 2 3/4 engines - Part number 424.   I have tried to order one from the club spares but apparently Jeff Swan is indisposed at the moment.

skapoor

2025-05-19, 09:23:12
I am looking for a carburettor for veteran Douglas motorcycle engine-13651. Could you please help me with this?

oil pump?

Started by tom hoek, 03 Feb 2012 at 10:38

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tom hoek

Hello bikers
Have another question
You know what this is for oil pump?  its from a  350 cc Douglas A32 1932
engine.
And how it works?

And how high should the oil level in the crankcase?

see photos

Greetings from tom



Larger view

Doug

#1
Tom,

The pump and timing cover is suitable for the A31 and A32. It is a dry-sump system, so there is no oil level in the crankcase. There is a oil level in the timing chest, sufficient for the lower cam gear wheel to dip in. The level is set by a drilled hole in the back wall. Excess oil flows into the crankcase chamber and is scavenged to the compartment in the petrol tank.

The oil pump does not supply oil directly to the crankshaft. It supplies oil to a spray-bar that drips oil into the path of the connecting rods. Shallow grooves on the leading edge of the crankshaft center web lead the oil into the side of the connecting rob bearings.

The attached illustrations should demonstrate what is going on in the three-stage pump.

Regards,
-Doug






tom hoek

Hello doug

Thanks for the pictures and explanations
it is very clear to me now  :D

greetings from Tom

Daren W Australia

too many dougli not enough time!

Alan Cun

Looks like the pump for 600 EW or E 29