75 Stern Drive again...
 

I have the 1975 formula thunderbird 19 footer mercruiser gm250 165 hp
that hasn't run well since the hurricane. i have been helped by the
group here also.

after all the cranking and plug changes, fuel supply change i know it
is the floats in the 1 bbl. mercruiser rochester carb. when the engine
runs the air/fuel adjustment screws do not work. the exhaust shows
signs of running rich by the black soot on the water.

the boat will run fine for a day and then not start for a few days. i
am searching now for a low cost 1 bbbl rochester carb for my boat.

anyone have a carb on the garage shelf ?

sonofadocker


Rand_man50 via BoatKB.com wrote:
OK, I got the previous problem figured out, but now it cranks forever and
wont start. When I spray starter fluid in the carb, it acts like its gonna
start. I cant see any gas being sprayed into the carb when its cranking or
when I pump the throttle, so I figure it's probably the fuel pump or a
clogged fuel line. I think the fuel pump is on the outside of the tank so
it's not hard to get to. How do I check to see if its good?

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75 Stern Drive again...
 

Shift cable adjustment. That's can be a bit tricky too as it not only puts
it into gear but to get them out of gear there are a couple switches that
interupt the ignition. Another rube goldburg if you ask me. The gears are
cut so the engine torque holds them in. But then when the prop is pushing
against the water you can't get it out of gear worth a damn. So they put
switches in that actually stall the engine for a second so you can get the
gears apart. The whole deal only works when it is in the water too. When
it is on land there is no resistance pushing back on the prop. Try just
adjusting the cable that goes to the out drive and not the one that comes
from the shifter. The plugs are screw in plugs, not grease fittings. They
will be flush. Sounds like you're doing pretty good so far :-) That free
boat might just be all right.

"Rand_man50 via BoatKB.com" u26765@uwe wrote in message
news:667d99a762e85@uwe...
I got some muffs and ran it for a while. I found the source of the
clattering.
It's coming from right behind the prop, like you said. It only does it in
neutral. Every time it clatters you can see the prop hop forward a little.
When I engage it in forward it stops making noise and the prop starts
spinning. when I try to put it in reverse at low rpm it clatters even
more.
If I turn up the throttle some it finally seems to drop into gear and
starts
spinning in reverse. I'll look for those grease plugs like you said.

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75 Stern Drive again...
 

Yeah, I can't believe how well everything has worked out so far. I'm just
waiting for something to blow up or catch on fire. You have been a really big
help so far, and I'm sure I will have more problems down the line, but I
think I'm done for the day at least.

Thanks again!

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