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Post  getback Wed Jun 17, 2015 8:15 pm

I got one of these that I need a needle valve for I tried wen mac other McCoy 049 engine , they will only screw in about 2 turns I am guessing the thread pitch is difft. from glow ? any idea what will fit . Thanks McCoy Duro Glo needle  Mccoy_10 McCoy Duro Glo needle  Mccoy_11 Took a month of soaking to get it freed up cheers
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Post  Mark Boesen Thu Jun 18, 2015 5:03 am

An early Wen-Mac needle should work on a McCoy diesel, you might have a damaged, cross threaded needle or venturi.
Oil up the needle and pinch tight with paper towel and turn counter clockwise, then look at threads.
I just checked some old parts and a needle from a wen-mac (early 60's) worked fine in a McCoy diesel.
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Post  cox24711 Thu Jun 18, 2015 7:32 am

i have one for spare its yours for $3
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Post  Oldenginerod Thu Jun 18, 2015 9:26 am

Eric. Has this engine ever had a needle valve fitted since you had it? Maybe there's something stuck in the spray bar that's jamming it. Busted off needle tip maybe? Try to push a thin probe through from the nipple side.

Rod.
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Post  getback Thu Jun 18, 2015 1:22 pm

Thanks cox24711 , Rod the hole is clear , I took it to the shop and blasted it with some carb. cleaner and 90 psi air , you can see through it good . Mark I think maybe the venture is crossed threaded do you know what thread is ? Here are the ones I have tried are they old enough , I don't know ....  McCoy Duro Glo needle  Wen_ma10   Thanks , Eric Very Happy
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Post  Mark Boesen Thu Jun 18, 2015 3:14 pm

The Wen'Mac needle is actually from a mid sixties Wen-Mac, its the same threads as the McCoy diesel, i'm not sure thread size,

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Post  getback Thu Jun 18, 2015 5:39 pm

Thanks Mark it appears to be a no. 2 I hope its 2-56 I have that tap , if its not an odd ball I can fix it easily Very Happy
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Post  Ken Cook Thu Jun 18, 2015 6:18 pm

Eric, if all else fails, I'm sure you could retrofit a spraybar and needle valve to that engine. Kap Pak and Perfect made some replacement style needle valves with a spring like extension and a knurled knob on the end. These were universal for several older model engines like OK engines and Wasps etc. I'm sure the spraybar could press out easily and a substitute like a Cox needle spraybar and needle from a product engine could be used. I prefer to sleeve if needed by machining a bushing to the case and press the spraybar into it. While not pretty, JB weld can be used and will do a satisfactory job. JB weld can be cleaned up prior to drying the same way one cleans epoxy by using a cotton swab and alcohol. Do you have the diesel fuel for it? Ken
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Happy Re: McCoy Duro Glo needle

Post  getback Mon Jul 06, 2015 2:01 am

ok finally go around to trying to remove the needle valve  on this thing no tap I could find would fit so replace it is ,, all I had was a drill press so I chucked up a flat round punch in that baby and leveled the engine put some pressure on it and volia it moved , have not pulled it all the way out yet but was a lot easier than I thought it would bee . my first one but not my last     McCoy Duro Glo needle  Wp_20124 sorry no press pic was in a hurry between some other work , Thanks for egging me on to do this Wink
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Post  smooth_bill Mon Jul 06, 2015 6:31 am

Mark Boesen wrote:The Wen'Mac needle is actually from a mid sixties Wen-Mac, its the same threads as the McCoy diesel, i'm not sure thread size, ......

Hi Mark,

If I recall the McCoy needle valve is #2 X 72.

Recently bought another McCoy .049 diesel, and found after talking to the seller that it had never been run! No box or papers, but the price was right.

Bill
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Post  getback Mon Jul 06, 2015 11:05 am

Bill , I don't see 2x72 but there is a #2x64 http://www.harveytool.com/secure/Content/Documents/Tap_Drill_Chart.pdf the 56 would not go in , nice find on the McCoy (new) Very Happy Eric
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Happy Re: McCoy Duro Glo needle

Post  smooth_bill Wed Jul 08, 2015 12:52 am

getback wrote:Bill , I don't see 2x72 but there is a #2x64  http://www.harveytool.com/secure/Content/Documents/Tap_Drill_Chart.pdf the 56 would not go in , nice find on the McCoy (new) Very Happy  Eric

Hi Eric,

Oops! My mistake!

The McCoy .049 needle valves are 1-72, and not 2-72 as I said.

My brain cells are obviously fading with age!

Bill
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Post  getback Wed Jul 08, 2015 1:33 pm

Bill you are correct my screw gage messured a 2 but the dial o meter says a little under 1 >> if I had a microscope I mite could tell the thread pitch Very Happy McCoy Duro Glo needle  Thread10 Thank You , Eric Very Happy
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Post  smooth_bill Wed Jul 08, 2015 5:54 pm

getback wrote:Bill you are correct my screw gage messured a 2 but the dial o meter says a little under 1 >> if I had a microscope I mite could tell the thread pitch Very Happy

Eric,

I considered making substitute brass needles from 1-72 X 3/4" hex head machine screws. A 1/2" screw may even be long enough?

Fortunately, Mark Boesen was kind enough to give me one of the aftermarket needles he had at that time - thanks again Mark!

There are several articles on the forums about doing this with inexpensive shop tools.

As it turns out almost all the early USA made half A engines used the same needle thread.

Bill
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