Author Topic: EW600 timing case screws  (Read 1147 times)

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Offline geomellish

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EW600 timing case screws
« on: 11 Apr 2018 at 12:27 »
My engine rebuild is nearly complete (see but somehow I have managed to lose one of the timing case screws.

This previous discussions on this forum might indicate the raised head countersunk screws are 3/16 x 27 tpi for all the twenties Douglases. However my screws which appear to be the originals, are larger at 7/32 x 25 tpi.  This is another odd size, presumably Douglas produced. Does anyone have any information about this (or indeed have a spare)?  I wondered if I could take a metric M6 6mm, 25 tpi screw and pare it down a little then run a very tight die down it.

Regards, George

Offline Doug

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Re: EW600 timing case screws
« Reply #1 on: 11 Apr 2018 at 22:13 »

Douglas used a 7/32-24 on a few things like the flat head countersunk screws holding the rear plate onto the EW clutch and some suspended 2-3/4hp fuel tanks that used a countersunk, dome head screw. But they kept with the 3/16-27 thread for the timing cover long past the EW era. 

It sounds like your timing cover may have been re-tapped for 2-3/4hp petrol tank screws.