Re: [OMC-Boats] Carb Issue? Or maybe Water issue?

Thanks again for the tip Jeff. I replaced the hoses with clear ones and
could track the water flow in and out of the bell housing. Pretty neat.

In my driveway I hooked up the sterndrive to a garden hose and idled fast
at around 1500-2000rpm. The water temp gradually increased to 130, 140,
150. Water flow was great and I felt the hoses to check the temperature.
Facing the engine, the hose on the lower left side was twice as warm as the
right side, and consequently the BARR exhaust manifold was hot to the
touch, the other side warm.

I waited a bit longer and increased throttle, I noticed the water flow on
the warmer side slowed down to a stream, the other side seem to stay about
the same. Very strange. Temp gradually increased to 160, 170, 180 before I
backed it down.

Maybe overheating was the reason the boat coughed when running all out. We
have taken the boat out many times just cruising, and then maybe a trip
through the speed zone, then back to idle again and not a problem. Longer
runs seem to be a different story.

-Gas can was vented
-Airflow was excellent
-Fires and runs great
-Carb seems be working fine
-BARR exhaust manifolds are clean inside and were new 2 years ago
-water stream out of stern was cool to warm

Maybe a bad thermostat or housing? Why would one side be warmer than the
other. Anybody got any ideas?

Jeff L

----------------------------------------
From: "jd" <jdood@...>
Sent: Sunday, June 28, 2009 9:18 AM
To: "Evinrude & Johnson Boats of the 1960's and 70's"
<omc-boats@...>
Subject: Re: [OMC-Boats] Carb Issue? Or maybe Water issue?

On Jun 26, 2009, at 3:41 PM, Jeff LaCoste wrote:

> After many weeks of slower rides around the lake, last week I took
> the 1964 Johnson Deluxe V6 155hp out into open water to run it and
> see what would happen. Got off to a slow start and steadily climbed
> up to 3/4 throttle for a couple miles when it started to cough,
> once, then twice, so we slowed and turned back for the dock. It
> seemed to be running smooth once again, so we increased the speed
> and once again it coughed and sputtered.
>
> We took off the cover and idled for a bit and after a while it quit
> and wouldn't start. We waited and tried again but nothing. We
> thought maybe over heating, or no gas. We noticed the Barr exhaust
> manifolds were a little warmer than usual, bottom hoses were warm,
> top were cooler. Thermostat was replaced last year. We were getting
> good flow from the back stream. Water flow seemed a little low in
> the large water Gates hose when squeezed.

a cool tip i picked up from someone on this list last year......change
out your hoses to clear hoses. I did all mine, didn't take that
long, Home Depot has hosing, heat hasn't seemed to be an issue
with melting etc. Instantly shows you the water moving through the
engine and where. And it just looks neat seeing the water
circulating around. I still have mine on and plan to keep them
on until i get everything solid.
>
>
> When cranking the engine we couldn't see much fuel going into the
> carb. Fuel was supplied by a 6 gallon tank (temporary while
> refurbishing the old tank) connected to the mechanical fuel pump.
>
> The other day I go out to start troubleshooting, get in the boat,
> turn on the water to the stern drive, and it fires right up! Go
> figure.
>
> Could be overheating. Maybe the float needs to be adjusted, if so do
> I bend the tang up or down? Last year I replaced the float with a
> new one that had a pinhole.
>
> anyone have any thoughts before I try it out again this weekend?

just curious, probably unrelated - but is your cowling vented?

>
>
> thanks.
> Jeff
>
>
>
>
> _______________________________________________
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Received on Sunday, 28 June 2009