[dvnr] advise needed oil leak
bsafr at aol.com
bsafr at aol.com
Wed Mar 25 18:56:50 EDT 2020
Nice job Bill. You could have worked on the tunnel digging teams when they bulit the Transcontinental Railway!
Though Im sure its not necessary, what does the group think of the use of a suitably threaded socket head screw to replace the standard one, in addition to the sealants being considered? I know, I know.... Level 3.
Brian
-----Original Message-----
From: William F. Dudley Jr. via DVNR <dvnr at casano.com>
To: Daniel Sellers <dansellers45 at gmail.com>
Cc: DVNR <dvnr at casano.com>
Sent: Wed, Mar 25, 2020 5:44 pm
Subject: Re: [dvnr] advise needed oil leak
Dan et al,
Dan's measurements and my crude measurement technique (working on
the motor IN THE BIKE) were sufficient to get my pilot drill
close, and then by some drill bit abuse I was eventually able
to drill a .400 hole right over the leaky screw. See attached
picture.
I have successfully removed the screw (it was "tight-ish", but
certainly no struggle to remove).
To re-assemble:
1. should I put lock-tite on the threads (after cleaning screw
and hole with brake cleaner) ?
2. should I put Yamabond on the shank of the screw near the head?
3. what torque should I apply to the screw? Is there a number,
or is "big grunt with screwdriver" good enough?
Thanks,
Bill Dudley
On 3/25/20 3:53 PM, Daniel Sellers wrote:
> OK Mr Dudley
> The dimensions for the screw hole on an 850 Commando that pertain to
> your dimension "X" and "Y" are:
> X = 1.885"
> Y= 2.44"
> Mind you I am measuring from two different planes but dimensions are
> taken from one plane. I compared the dimensions to a 750 Atlas and they
> are the same.
>
> Good Luck with the oil leak.
>
> Cheerio
> dan
>
>
>
> On Wed, Mar 25, 2020 at 2:34 PM Daniel Sellers <dansellers45 at gmail.com
> <mailto:dansellers45 at gmail.com>> wrote:
>
> OK Mr Dudley
>
> On Tue, Mar 24, 2020 at 8:22 PM richard casey <saxmanrich at gmail.com
> <mailto:saxmanrich at gmail.com>> wrote:
>
> I second what Mr Sellers has stated.
>
> On Tue, Mar 24, 2020 at 7:03 PM Daniel Sellers via DVNR
> <dvnr at casano.com <mailto:dvnr at casano.com>> wrote:
>
> Bill
> The screw circled in red is one of two machine screws that
> fasten the left
> and right crankcase halves together independent of the
> larger bolts that
> fasten the engine to the cradle. The oil is likely leaking
> from the same
> location and some coming from the crankcase half joint and
> some getting out
> of the same leak an weeping out the screw hole. Did the
> bolts mounting the
> engine to the cradle work loose? Good luck sealing a leak
> externally after
> oil has gotten between the existing seal between the case
> and sealant. You
> might be able to reduce the leak by tightening the 1/4"
> machine screw and
> mounting bolts.
>
> These are my thoughts. I'm sure you will have some experts
> explain it
> better.
>
> Dan Sellers
>
> On Tue, Mar 24, 2020 at 5:47 PM William F. Dudley Jr. via DVNR <
> dvnr at casano.com <mailto:dvnr at casano.com>> wrote:
>
> > Hi,
> >
> > My 71 Commando is weeping oil out of the motor.
> >
> > There are two leaks. One is the case joint between left and
> > right halves, aft of the oil drain/oil screen.
> >
> > The other one is from the screw around which I have drawn
> > a red circle in the attached photo.
> >
> > I don't want to disassemble the entire motorcycle for these
> > stupid leaks. I can goober up the case on the seam with some
> > RTV and stop that leak, but the one at the screw is harder,
> > since the screw is hidden behind the engine mounting plate.
> > (I also have some more sophisticated means to seal that leak
> > on the seam. So I may not end up goobering it up with RTV.)
> >
> > I thought that if I drilled a hole in the engine mounting
> plate,
> > right over that screw, then I could then sort out that leak
> > one way or another.
> >
> > Questions:
> >
> > 1. what does that screw do? Does it just plug an oil way
> after
> > the factory drilled the oil way during manufacturing?
> >
> > 2. Does anyone have a Commando case not mounted in a
> motorcycle
> > from which they could measure 'X' and 'Y' as shown on my
> drawing?
> > That will help me locate where to drill.
> >
> > I plan on putting a stainless plate between the engine
> mounting
> > plate and the crankcase when I drill, so that I don't
> overshoot
> > and make a mess of the case.
> >
> > Thanks,
> > --
> > Bill Dudley
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