I experience a similar condition.  Mine is compounded by the HP pump shims
weeping oil.  I'd be willing to try a new dipstick first if one was
available and not too costly.  Truly I probably only need the dipstick
gasket.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD

On Jul 5, 2017 11:56 AM, "Howard and Skippy via CnC-List" <
cnc-list@cnc-list.com> wrote:

> Hello All,
>     For the last few years, I had a significant loss of oil whenever I ran
> the engine for more than a few minutes. During 1 run through Hell's Gate
> back to home waters in Raritan Bay, the oil light and buzzer sounded
> (naturally at the worst time). We hoisted the sails and sailed down the
> East River - not recommended! When in Raritan Bay the wind died, I got a
> tow from SeaTow back to the mooring. This convinced me to rebuild the
> engine over last winter, however, after a great deal of trouble shooting
> and having multiple eyes look at the situation, we noticed that the bulk of
> the oil was accumulating on the side of the engine with the dip stick. The
> dip stick slid in easily. Further exploration led to the conclusion that
> the source of the oil leak was, in fact, the dip stick. Finding a new
> replacement for an old 3GM was a task as all the dealers said none were
> available. An old salty engine repair man I met at the Annapolis boat show
> told me he could get one. He did. I now have a tight seal and no oil leak!
> If you have an old Yanmar and it has a mystery leak, check your dipstick
> for proper fit.
> Howard Paul, Skipper of Knot Again 35-3
>
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