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

From: David <odin@...>
Date: Tue, 27 Jun 2006 06:59:04 -0500

I would like to add that a quick way to check to see if the impeller is
working at all is to look at the top of the right hand (starboard)
side of the sterndrive - a stream of water should be shooting out of
the bottom of the endcap - it should be strong even at an idle - of
course the drive has to be in the water. Dave

Glenn Halweg wrote:

> 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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