Engine Overheat while hooked up to Flush Attatchment

[td95ma]

I finally got my 1971 rude up and running again, had her idle at about 500 rpm with a flush attatchements while I checked her over ran for about 15 minutes and then the hot horn started blaring....think I did somethign wrong with my water pump installation? I will have her in the water this weekend but I am wondering if I should drop the lower unit again to check things out....what do ya'll think?<br /><br />tommy

 

[DJ]

Re: Engine Overheat while hooked up to Flush Attatchment

tommy,<br /><br />It's not unusual for a crossflow to overheat "on the muffs". Especially if you have the type of muff that only feeds water from one side.<br /><br />Drop the unit in the lake and see.<br /><br />Your '71' doesn't have a "telltale" water pump water exit, thus it's hard to tell.<br /><br />A couple things to check.<br /><br />1. Does any cylinder head(s) get too hot to touch for a few seconds?<br /><br />2. Do you have a spray from the exhaust relief holes? They are located on the rear and top of the leg.<br /><br />You can also check the "hot horn" by locating and grounding the tan wire that goes to the heat sensor(s) in the head(s).<br /><br />The heat sensors are the components that look like they were glued into the cylinder heads.

 

[NEECAPRS]

Re: Engine Overheat while hooked up to Flush Attatchment

Tommy: I have a motor of another brand for which the muffs never worked-- couldn't get enough water into it. So, I put a large metal female hose repair end through the bottom of an aluminum chip-dip can that's about 5" dia, about 2" deep and strap it onto the lower unit very tight with bungee chord. Cover the other side's inlet holes with a rag under a plate of wood or whatever, then squirm the can dowm into place so it conforms to the lower unit's curve. Not pretty, but, works beautifully. Lasts forever! Hook up the hose and the pump picks up the prime quickly with little risk of burning.

 

[td95ma]

Re: Engine Overheat while hooked up to Flush Attatchment

Hey guys thatnks for the tips, I used an oversize barrel to create my slef a test tank and all was well. Ran idle for 20 minutes never got too hot to the touch lets just hope this is the end of my troubles its been a bumby road this year......Tommy Thanks for all the help this site saved me several times

 

[braindead0]

Re: Engine Overheat while hooked up to Flush Attatchment

This got me to thinking that perhaps I might experience the same with my '89 25hp Evinrude..<br /><br />What's the deal with a cross flow? I intend to fire it up (first time for me, and the previous owner had it stored in his basement since last year) Saturday, de-carbon and run it up a bit. <br /><br />Kinda wondering if I should use muffs, or a large trashcan (with water constantly flowing in of course). I don't plan on running it too long, just long enough to de-carbon and make sure that water is flowing.