[dvnr] advise needed oil leak

[Frank Mohr]

Bill 
I have a feeling you’re going to try and fix that leak externally. If it works please let us know. 
Frank

Sent from my iPhone

> On Mar 25, 2020, at 2:54 PM, Daniel Sellers via DVNR <dvnr at casano.com> 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>
>> 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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