496 HO water leakage mystery
07-13-2010, 09:06 PM
#11
Registered
Join Date: Jan 2003
Location: Pgh. Pa.
Posts: 853
Likes: 0
Received 0 Likes
on
0 Posts
Sir:
I would predict you are leaking water at the rear of your water pump while underway. I had mystery water also. No leak at rest or idle. If you can, crack open your engine hatch while someone else is operating the boat. Forward speed combined with water pump pressure will allow a weak valve on the rear of the water pump to leak. Peak inside and verity. The valve controls the quick drain system. It seems to be a frequent problem with the 496 power system. I had to replace the rear assembly on the water pump to stop the leak. Thank goodness for warranty.
I would predict you are leaking water at the rear of your water pump while underway. I had mystery water also. No leak at rest or idle. If you can, crack open your engine hatch while someone else is operating the boat. Forward speed combined with water pump pressure will allow a weak valve on the rear of the water pump to leak. Peak inside and verity. The valve controls the quick drain system. It seems to be a frequent problem with the 496 power system. I had to replace the rear assembly on the water pump to stop the leak. Thank goodness for warranty.
07-14-2010, 05:08 AM
#12
Registered
Thread Starter
One thing I have noticed is that when I pull the boat out of the water, my port side low water pick up will drip water out of it for days. The starboard one will only drip for a couple of hours. I wonder if this is a direct result of the other problem I'm having?
07-14-2010, 05:15 AM
#13
Registered
Thread Starter
This sounds like a good idea. I wonder if I might be able to get the pressure high enough on the hose this way?
07-14-2010, 07:52 AM
#15
Registered
Thread Starter
07-14-2010, 07:23 PM
#16
Registered
Join Date: Jan 2003
Location: Pgh. Pa.
Posts: 853
Likes: 0
Received 0 Likes
on
0 Posts
this is what I ment ,pump some air in the shreader valve and this will show you the answer,it should drain out all of the water ,then pull the ring next to the shreader to close the system.those valves are only for winterizing I had to remove mine as they went bad ,I bought some barbed fittings from teague that worked great I eliminated entire system it couldnt handle the pressure from running Imco lower at speeds near 100 mph I tried regulating the pressure created new issues
Last edited by crayolacrazy; 07-14-2010 at 07:40 PM.
07-14-2010, 09:08 PM
#17
Registered
Thread Starter
Are you saying that if I pump up the system with the schrader valvei t will pump water out of the areas that are leaking along with the normal dump spot?
07-15-2010, 06:42 AM
#18
Registered
Join Date: Aug 2006
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
It would puke the water into the bilge a pretty good amount above 3000 rpms or so. I was fortunate enought to be able to see both valves when running. I know a friend of mine just cut a quick piece of PVC to bypass his when his starboard one went bad to narrow it down.
07-15-2010, 07:30 AM
#19
Registered
Join Date: Jul 2007
Location: Lake Winnebago, MO, 43MM LOTO
Posts: 220
Likes: 0
Received 0 Likes
on
0 Posts
I had a mystery leak for 2 seasons checked everything several times over, check the speedo connection where it comes thru the transom on inside of the transom assmbly, your leak sounds very similar and my speedo worked fine, would spray water up on back of engine so I thought it was cooler or exhaust, could unplug the speedo on the outdrive and see if it stops, just and idea, goodluck
07-15-2010, 07:46 AM
#20
Gold Member
Gold Member
I had this happend to me a little blockage in the oil cooler,enough water passage not to overheat .blockage created pressure and the brass blowoffs under the exhaust would drain into the bilge when I would stop no leaks it took a long time to sort that out. I ended up putting sleeves in place of them as they went bad it seamed like springs in those gadgets got week,go for a run then feel those drains ,if you want to see where they drain pump air into the valve on front of the engine and it should push the water out of the spot Im talking about. SCHOOL OF HARD KNOCKS.hope this helps
