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michael p guidry
New member
Username: fishermanmike
Post Number: 1
Registered: 04-2009
| | Posted on Tuesday, April 28, 2009 - 11:02 am: | 
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I just purchased a 1989 21ft seaswirl. Powered by a 351 windsor ford. Can anyone here tell me the h.p. rating? Also, I came across a post where someone had hooked up the earmuffs on the lower unit and the engine completely flooded with water. What happened there? Last thing. Where to find a manual book on this engine. Thanks in advance. Mike |
oldmako
Advanced Member
Username: oldmako
Post Number: 115
Registered: 09-2004
| | Posted on Wednesday, April 29, 2009 - 09:36 am: |
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Hard to say on the HP...but my guess is 240. Unless it has GT40 heads...then more like 275-280.
The pressure from the hose forces water through the cooling system, then out the manifolds and up and through the risers.
Some risers allow this water to flow backward into the manifold where it then enters the exhaust valve in into the cyl. This is not necessarily a good thing for the engine.
Certain manufacturers designs allow this to happen. It doesn't on all. But, you don't have any way to know and the penalty for error is massive.
Solution: Don't hook up a hose. Rather suck cooling water from a drywall bucket into which you have jammed the hose. You will need to jury rig a short length of hose and a T fitting to do this. The benefit is that you can easily flush the system without danger, and you can easily add antifreeze when you go to winterize. The whole deal can be done for less than 5 bucks.
You can use a hose if you start the engine first and then turn on the water a second after the engine catches. Just prior to killing the engine, turn off the hose. That water pump impeller will fry itself in short order if you allow it to spin with no water. Don't ask me how I know this.
Since yours is an I/O, it's going to be a bit trickier as the raw water pick up pump in the lower unit is spinning. You may have to use the muffs. Just don't let the hose run with the engine off unless you that your risers do not permit back flow. I don't have this issue as mine is a straight IB. Somebody here will offer you additional info. |
michael p guidry
New member
Username: fishermanmike
Post Number: 3
Registered: 04-2009
| | Posted on Thursday, April 30, 2009 - 10:56 am: |
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thanks a million. |
James E. Harris
Member
Username: engineguy68
Post Number: 15
Registered: 03-2009
| | Posted on Wednesday, May 27, 2009 - 10:13 pm: |
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YOU don't say what kind of an outdrive you have, but if you go to NAPA you can probably find the SEALOC manual for the drive and the engine combination you have. |
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