[dvnr] advise needed oil leak

[Daniel Sellers]

OK Mr Dudley

On Tue, Mar 24, 2020 at 8:22 PM richard casey <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>
> 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> 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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