[dvnr] advise needed oil leak

[Daniel Sellers]

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>
wrote:

> 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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>>