I own a 34' sailboat that has a 1985 Yanmar 3GM30F that needs repaired.
Can't get the rpms out of it that I had in the past plus I am blowing some
black smoke and while in the slip if I give it hard throttle I can see black
floating on the water. This all occurred after the injector pump was
replaced and adjusted by a yard mechanic. My max rpm's in the past was
3200 -3300 which could be more but is limited by the throttle hitting my
steering pedestal guard. Right now I am getting just 2800 rpms max.

After the suggestion from the mechanic I replaced the old fuel with new
fuel and filters and some hoses were replaced. Fuel line is clean. Fuel
tank pickup is clean and not clogged, tank is clean. I am tired of playing
with the problem. It has been almost 2 months since I have been on the
water. I am looking for recommendations on a good marina for repairs
somewhere from Annapolis North to Pooles Island.

Thanks

Since your engine worked before I am going to make a guess here and say that
the fuel timing is off. There is a shim pack that goes under the injector
pump to time when the fuel enters the engine. Shimmed to high and the fuel
enters later and you get less power. Shimmed to little and the fuel enters
to early and you get problems.


"Ron" wrote in message
...
I own a 34' sailboat that has a 1985 Yanmar 3GM30F that needs repaired.
Can't get the rpms out of it that I had in the past plus I am blowing some
black smoke and while in the slip if I give it hard throttle I can see
black
floating on the water. This all occurred after the injector pump was
replaced and adjusted by a yard mechanic. My max rpm's in the past was
3200 -3300 which could be more but is limited by the throttle hitting my
steering pedestal guard. Right now I am getting just 2800 rpms max.

After the suggestion from the mechanic I replaced the old fuel with new
fuel and filters and some hoses were replaced. Fuel line is clean. Fuel
tank pickup is clean and not clogged, tank is clean. I am tired of
playing
with the problem. It has been almost 2 months since I have been on the
water. I am looking for recommendations on a good marina for repairs
somewhere from Annapolis North to Pooles Island.

Thanks

"Ron" writes:
I own a 34' sailboat that has a 1985 Yanmar 3GM30F that needs repaired.
Can't get the rpms out of it that I had in the past plus I am blowing some
black smoke and while in the slip if I give it hard throttle I can see
black
floating on the water. This all occurred after the injector pump was
replaced and adjusted by a yard mechanic.

Sounds like a timing problem.

Some else has already suggested the solution.

Mack Boring awaits your money.

Lew

Ron,

Please, don't do anything rash.

To start with, if you paid this mechanic to service the injection pump
(why this happened is another question) then the job as contracted is
not complete.

Part of any injection pump R&R is the setting the pump to the specified
timing, calibration for maximum fuel delivery, maximum no-load speed and
idle speed. He isn't done.

If their service people suggested that this was the cure for what ever
your problems were, then they owe you at least an explanation why it
wasn't better when they left and probably some corrective action as a
part of work done at the original agreed cost.

Black smoke indicates a current combustion problem that has not been
corrected. The throttle lever can probably be adjusted so the speed is
not limited by the pedestal guard.

The black soot floating on the water could be from lots of different
combustion related problems or could just be the soot that accumulated
in the muffler, but given the responses you have gotten from these
jokers I think your choice to find another service facility is well founded.

Matt Colie
(One of the licenses is Chief Engineer Steam or Motor -unlimited)
Lifelong Waterman, Licensed Mariner, and Perpetual Sailor



Ron wrote:

I own a 34' sailboat that has a 1985 Yanmar 3GM30F that needs repaired.
Can't get the rpms out of it that I had in the past plus I am blowing some
black smoke and while in the slip if I give it hard throttle I can see black
floating on the water. This all occurred after the injector pump was
replaced and adjusted by a yard mechanic. My max rpm's in the past was
3200 -3300 which could be more but is limited by the throttle hitting my
steering pedestal guard. Right now I am getting just 2800 rpms max.

After the suggestion from the mechanic I replaced the old fuel with new
fuel and filters and some hoses were replaced. Fuel line is clean. Fuel
tank pickup is clean and not clogged, tank is clean. I am tired of playing
with the problem. It has been almost 2 months since I have been on the
water. I am looking for recommendations on a good marina for repairs
somewhere from Annapolis North to Pooles Island.

Thanks

Our 2GM had similar symtoms - without the advantage of a new pump.
Sent the injectors off to Mac Boring for refurbishing, and all is
pretty much well again.
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