Douglasmotorcycles.net
General => General Douglas Discussion => Topic started by: LATDOUGNUT on 29 May 2010 at 09:47
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Hello All,
I have had a small batch of EW 350 oil pump drive gears commissioned. Please see attached photo. They were made in 3 % Nickel Chrome steel, case hardened just skin deep and tempered and the hole was ground to fit the pump shaft. I have 3 surplus gears that I can sell @ Euro 40 each plus P&P. I have a Paypal account (+4% of the total amount if paid by Paypal). If anyone is interested please email me off group. I also have 1 surplus EW 350 gear lever made in Chrome steel on a CNC milling machine and ground -- ready for plating @ Euro 60 if anyone is interested. Photo attached.
LATDOUGNUT
(https://www.douglasmotorcycles.net/aa-files/images/latdougnut/2010/EW%20oil%20pump%20gears-750.jpg)
(https://www.douglasmotorcycles.net/aa-files/images/latdougnut/2010/EW%20gear%20change%20lever-750.jpg)
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Note that there were 20 and 24 tooth versions of the 350EW pump gear. Douglas apparently changed to a 20 tooth gear of a slightly coarser pitch (not sure when) to get more depth of engagement and alleviate the stripped gear problem. The two types are not interchangeable; unless you replace the mating drive worm at the same time. So if replacing the oil pump gear, make a note of the number of teeth and replace with one of the same tooth count. I can not get a tooth count off of these, but the look like the 24 tooth gears. Which are the type that often most need replacing.
-Doug
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Hello Doug,
Thank you for clarifying the number of gears issue -- mine are the 24 teeth type.
LATDOUGNUT
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Hello Latdougnut, is there any chance you have an oil pump gear available? Mine is stripped. It has 24 teeth.
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HELLO RRINOZ,
YOUR OIL PUMP GEAR WAS POSTED YESTERDAY. PLEASE ADVISE WHEN YOU RECEIVE IT.
JURIS
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my worm gear is a 10 pitch...my oil pump gear ( that I have is 20 teeth...)
is this a match???
my 20 tooth pinion is missing half the teeth...I have made a new 20 tooth.....but doesn't seem to mesh very well...??
also..on a 26 ew..is there a spring and ball in the end of the crank?? or a flapper valve?? fixing crew??
all I have is a the end of the crank...and the worm...
once I read this post I may have to make a 24 tooth...se if that meshes any better
any advice at all would be wonderful
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HI,
THE PUMP GEAR IN MY EW350 HAS 24 TEETH. I MADE A SMALL BATCH OF THOSE, BUT ALL ARE SOLD NOW. IF I REMEMBER RIGHT THE CRANK END HOLE ON MY DOUGLAS HAD A BRONZE JET WITH A HOLE AND A SPRING. IT IS INTENDED TO METER OIL FLOW TO THE CRANK. THE JET HAS THROUGH HOLES FROM THE SIDES AND ONE HOLE GOING INTO THE CRANK END.
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latdougnut
thanks heaps for the advice...another part I didnt even know I was missing...the quill to connect the oil feed...I knew something had to be in there...connect the oil pump to the crank... a picture and some dimensions of that part would be great
the oil pump drive...I am going to cut a worm gear...I have one but lots of rust pits...and being hardened..the pinion wouldn't last long
a bout of the flu has held up my gear cutting..
got my #5 b.a. die from tracey tools...so now I can make the little pin for the oil pump...either make from en36 or silver steel?? any thoughts..???
so anxious to get this side of the motor done...then I can start on the other side