Re: [omc-boats] Tuning engine out of the water?

From: Glenn Halweg <glennhalweg@...>
Date: Tue, 27 Jun 2006 00:56:37 -0500

On the subject of tuning out of water, it only takes 5 seconds to destroy
the impeller. Either method OMC adapter or radiator flush adapter will work
satisfactorily. If you have engine overheating problems while running on a
hose there is no way I'm aware of to check impeller operation. To check the
impeller have the boat in the water or the drive unit submerged. You remove
the hoses running from the intermediate housing to the thermostat housing
one at a time. You should have approximately one gallon flow in 30 seconds
at idle. Of course if you have a 4 cylinder engine there is only one hose.

----- Original Message -----
From: <lib1@...>
To: <omc-boats@...>
Sent: Monday, June 26, 2006 6:31 PM
Subject: Re: [omc-boats] Tuning engine out of the water?

> RE: Water adapters: Tempo Products used to make a spring loaded adapter
> that allowed a graden hose to supply water to the sterndrive water pickup,
> just aft of the prop. These are virtually unobtainable, unless you lucked
> into somebody's NOS. OMC also made a bolt on hose adapter, that replaces
> one of the end-caps. These are more plentiful than the Tempo-style but
> still fairly expensive (used or new).
> I like the radiator flush idea, but have never tried it. Seems like a
> sensible, affordable approach.
> Of all the precautions listed, the most important one is never start the
> engine dry. Even for 10 seconds. The 1200 -1500 max RPM while on
> "artifical" water is OK, but some times you're going to blip the throttle
> to check various enginme functions. The over-heating of "out-of-water"
> shift coils is overly cautious. They just don't get very hot. Unlike your
> coil ballast resistor if you leave the key on very long without the engine
> running.
> ----- Original Message -----
> From: "Ethan Brodsky" <brodskye@...>
> To: <omc-boats@...>
> Sent: Monday, June 26, 2006 9:46 AM
> Subject: Re: [omc-boats] Tuning engine out of the water?
>> On Sun, 25 Jun 2006, Tom Kennedy wrote:
>>> OK I've got another question...when I bought my boat (68 Sportsman 155),
>>> it had been sitting for a number of years outside without being prepared
>>> for storage. To make a long story short, I'm rebuilding the carb among
>>> a bunch of other things. I don't have access to water where I can
>>> tinker with the engine for an extended period (public access nearby is
>>> all). SO is there any safe way I can run the engine/drive out of the
>>> water while I tune/time it? There is no garden hose adapter (can this
>>> be purchased and fitted?) and the universal earmuff-style garden hose
>>> adapters don't work on these things.
>>> What to other landlocked owners do when they need to run the engine for
>>> repairs? Any advice is greatly appreciated!
>> I've bought a plastic "radiator flush fill adaptor" for $3 from an auto
>> parts store and installed it in one of the hoses running from the
>> intermediate housing to an exhaust manifold. It's a "Y" that allows
>> you to hook up a garden hose and pump water directly into the coolant
>> system, into effectively the same spot as the OEM flush adaptors
>> (mentioned
>> by others).
>> I'm always concerned about adjusting the flow correctly - too little
>> and you might starve the pumps, no much and the pressure might blow out
>> seals. I've never been sure how to do this properly, but I try to
>> adjust the valve so that I have a little water back-flowing out
>> the pickup during operation. Due to the restriction in the flush
>> fill adaptor I have, this is almost wide-open on the garden hose,
>> but an unrestricted adaptor would allow more flow. Or maybe this
>> isn't something to worry at all - I don't know.
>> The service manual also cautions against running the engine at high power
>> on a flush adaptor (though without resistance, you can't dissipate much
>> power anyway), and also against leaving it in gear for long periods of
>> time
>> (since the shift solenoids are water-cooled through immersion of the
>> lower
>> unit).
>> Ethan
>> --
>> Ethan Brodsky
>> UW FutureCar Team Paradigm: Two-Year FutureCar Challenge Winner
>> UW-Madison Clean Snowmobile Team: Winner of the 2004 SAE CSC
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Received on Tuesday, 27 June 2006

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