[dvnr] advise needed oil leak

[Frank Mohr]

Could use both sealers however you still need the grunt. If you have a older style impact driver the kind you hit with a hammer I’d use that. 

Sent from my iPhone

> On Mar 25, 2020, at 5:44 PM, William F. Dudley Jr. via DVNR <dvnr at casano.com> wrote:
> 
> 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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> <drilled_engine_mount_1k.jpg>
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