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

On Jun 28, 2009, at 7:46 PM, heavy wrote:

> 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 have the OMC cylindrical manifolds.....but same exact thing with
mine........left one is always hotter than right. we both have that
happening with the same year....perhaps that means its supposed to be
that way? anyone?

cold water comes in on bottom and heated water goes out the top of the
manifolds, so i think it's normal for top to be hotter. but one
side hotter than other side doesn't make sense.
>
>
> 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.

do you have the pivot cap with the garden hose adapter/connection?
i do. i recently sealed my pivot caps up to the point of zero
leakage....but i have zero tell tale now. not sure i ever had
one. thinking maybe the tell tale was on the stock pivot cap that
somewhere along the line got replaced with the garden hose pivot cap
>
>
> 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?

i took my thermostat completely out just to eliminate it as a
potential problem. your probs sound very similar to mine - clean
manifolds, starts great, rebuilt carb, good airflow with cowling
off. however.......i am now leaning towards some electrical thing for
my temp issue (*more on that in separate post)

>
>
> 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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>
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Received on Monday, 29 June 2009