help with my 496ho over heating!

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07-06-2011 | 08:47 PM

#11

pagerboy

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what about one of these wear plates?

http://metalartetc.com/shop/article_...t.html?pse=apq

07-06-2011 | 09:38 PM

#12

flying J

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From: LOTO 19 MM

If the "walls of the chamber" dont have groves it usually works the ends all get groves in them and yes you can use that plate. Is the damn thing pumping water out the exhaust???.....Pull a hose and start it up that will let you know. Plus I think the alarm is constant when you dont have water PSI

07-06-2011 | 11:00 PM

#13

pagerboy

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yes it is throwing water out the exhaust but it is steamy. dont look like its as much coming out the starboard motor. guess i could switch the pumps and see if it follows?

Last edited by pagerboy; 07-06-2011 at 11:10 PM.

07-07-2011 | 08:03 AM

#14

ZP'd

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Have you pulled the ends off the heat exchanger and blown out the cooling tubes?

They do get debris in them that will plug up some of the passaages over time.

07-07-2011 | 08:29 AM

#15

Baja_man

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From: Michigan

Quote:

Originally Posted by pagerboy

what about one of these wear plates?

http://metalartetc.com/shop/article_...t.html?pse=apq

Yes this will work...haven't heard of anyone using it but it does address the grooves at one end.

07-07-2011 | 08:29 AM

#16

Baja_342

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From: Northern, KY (Cincinnati) Lake St Clair, MI Norris Lake, TN

Quote:

Originally Posted by Baja_man

There should be no grooves what so ever...everything should be smooth....the ends will look like the grooves were machined but there not.....it is suppose to be smooth! The design of the brass sea pump is bad, once sand goes thru it and the temp begins to go up the circulation is down causing this. Just change the pump and don't do any further damge to the engine. Hardin marine makes a stainless replacement that is cheaper than the stock merc pump and is better.

http://www.hardin-marine.com/p-15774...d-502-mag.aspx

At those prices I think I'll just replace the entire pump annually with a $50 Sierra kit. Of course I boat in the Ohio river. Deep water around here and don't have concerns with picking up sand. I only have to dodge dead bodies

http://cgi.ebay.com/ebaymotors/Sierr...ssoriesQ5fGear

Last edited by Baja_342; 07-07-2011 at 08:33 AM.

07-07-2011 | 08:32 AM

#17

Unlimited jd

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From: Taunton Ma

Does it have a freshwater flush kit? Make sure that's closed all the way had this happen the other day

07-07-2011 | 08:37 AM

#18

Baja_man

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From: Michigan

Quote:

Originally Posted by Baja_302

http://cgi.ebay.com/ebaymotors/Sierr...ssoriesQ5fGear

I don't think that kit will work with this application, older style I think?

07-07-2011 | 09:20 AM

#19

pagerboy

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Quote:

Originally Posted by lil red

Does it have a freshwater flush kit? Make sure that's closed all the way had this happen the other day

Is the fresh water flush at the top of the engine compartment where you screw the hose straght to the boat? I did use this the day this all started and I ran the boat for about 15 min while it flushed! did that screw it up? are you sposed to run motor while hose is hooked up at that location?