Hey, thanks for the advice! A question or two.

wrote:
Try this:

Get a plastic milk jug, cut it open so you can wipe it clean with a
rag. Put fuel in it. Get some clear tubing from Lowes or Home Depot.
Run the tubing to the fuel fitting on the inlet to your fuel pump.
Fill the tubing with fuel and allow it to siphon the fuel from the milk
jug. Start your engine. If it does not lose power as it did before,
then suspect your fuel filtration.
The Yanmar mechanical fuel pumps seem to go bad all the time. I got an
electrical pump from JC Whitney that I put in series with the
mechanical one. It is wired to the starter so it always provides low
pressure to the engine. It keeps the engine primed.
It sounds like you have both engine timing and fuel problems. Valve
timing is easy to set on this engine.

My buddy has a 2QM20 repair manual. It says the valve clearance should
be .15mm. My mechanic guy set it to that. Is that right? where can I get
the setting for the 2QM15?

Injection timing is a little
harder but a COMPETENT mechanic can do it.

We took it in to a shop who set both injectors to 100.

You can do it yourself if
you can follow the directions in the service manual.

For cold starting, use the decompression levers. Relieve compression
on one or both cylinders, get it turning then put in compression, this
will get things lubed well and moving before you are trying to work
against the compression.

You might also check your fuel return line. If it is blocked, you can
have problems. When you are priming the engine, remove it from the
fitting on the injectors, blow into it (a little diesel fuel in your
moth will not hurt you) to see if it is clear.

Take the exhaust hose off the exhaust manifold and run the exhaust into
a 5 gal bucket This will fill your cabin with smoke so be careful but
the idea is to see if your muffler is clogged..


Sorry for the dumb question, but how does this tell me if it's clogged?
Oh, it runs better after I take it off? Why in a bucket? I can see the
exhaust with water coming out below the transom.

Thanks!

--
Stephen

-------


For any proposition there is always some sufficiently narrow
interpretation of its terms, such that it turns out true, and
some sufficiently wide interpretation such that it turns out
false...concept stretching will refute *any* statement, and will
leave no true statement whatsoever.
-- Imre Lakatos

It's risky and often counterproductive to look for unseen second
guesses, expert or otherwise, when you are not doing the work yourself
& a shop is about to assess it firsthand. Unless they are grossly
incompetent, the best you may do with other input is to prejudice their
thinking & delay them in locating the real problem, or maybe **** them
off. If you don't trust them you shouldn't call them aboard. BTW a
disassembled & cleaned head is easily & inexpensively inspected for
cracks or similar flaws by penetrant dye-checking, requiring no x-ray.

wrote in
oups.com:

maybe **** them
off

You must admit, though, it _IS_ fun to point out the separated wires
leading to the run solenoid....seconds after you look in the hole he's been
pouring over for the last 3 hours...(c;

"I think that wire hanging there goes to that plug hanging there, don't you
think?", you ask innocently with a perfectly straight face. "Isn't blue
with the white stripe the run solenoid wire on this model?", as you quickly
back away towards the safety of the dock....(c;

The dead starting battery and dead house batteries that followed it will
recharge tonight...(sigh) It's only a 10A charger, you know.

--
Larry

Larry wrote:
wrote in
oups.com:

maybe **** them
off

You must admit, though, it _IS_ fun to point out the separated wires
leading to the run solenoid....seconds after you look in the hole he's been
pouring over for the last 3 hours...(c;

I suppose if one's idea of fun is a 3 x $80.hr = $240 additional cost
for a small joke, I should be looking for work with these generous,
rich people too. Please send email & plane tickets, I will handle the
rest. ;-)

I have found both as a ship fleet manager/Owner's rep and now a
part-time lowly yacht bilge contortionist, that the very best thing the
Owner or his rep can do in his own interests, is go away after initial
instructions and stay away or shut up until either asked for something
or until the work is completed. Then, if there are 3 hours of excess
charges on the draft account or preliminary bill slip for finding a
fooken wireG, it is dealt with THEN and refused. He who has the gold
makes the rules, not the process. This also avoids all problems or
claims of split responsibility. (i.e., "You are the yard or expert and
I don't think you will prevail in an arbitration over taking 3 hours to
find a solenoid wire with no interference by the Owner and no requests
for further information; I could trace out & draw a whole vessel's
wiring in 3 hours and you owe me dinner for telling you this along with
the reduction, too, plus another $100 for insulting me with your piece
of **** account.") :-)

This works all over the world, and builds good relationships - even
though you will not get the $100, dinner may be a hamburger, and you
know it.