tpabayflyer

[ATTACH=CONFIG]512954[/ATTACH]Good news is I Replaced a few leaking hoses and now can clearly see water leaking out of a little "overflow"? hole on the side of the pump...... Fuel pump oil reservoir contaminated with water so obvious a bad seal...... Going to bring it to an alternator repair place and see if they can do it or just bite the bullet and go new or get a standard pump and just go electric for the fuel...... Bad news is my O2 sensor fouled out after 2 minutes of running and I pulled it and it was WET?? motor was running fine? Exhaust is used 496 Aluminum with water rail that was supposedly pressure checked and used in a lake in Wisconsin...... Of course I spent plenty of cash having it all ceramic coated...... Leak is on port side and I have not checked starboard yet.... Going To pull both risers and take a peak inside... Also going to pull the plugs for a check. Here are more motor details......

Cam is relatively mild on duration 228/[email protected] with a 114 LSA

Stock aluminum 496 HO exhaust and stainless risers, new gaskets no turbulators

1" phenolic spacer sandwiched in between manifold(4 gaskets) with riser and O2 bung is right above manifold exit(collector)...

Riser has rubber hose on the end with an old style 454 cast elbow to direct water away from engine. I would not expect any reversion?

For what's its worth, the starboard side exhaust flows more water than the port? it looks like this is normal and not a real issue as the exhaust was always just warm to the touch. The motor is on a stand and running on the hose.........

Is there an easy way to pressure check the manifolds? Maybe just plug the hoses and fill the water jackets up and see if the level drops? I would assume the risers are ok being stainless but I would think at this point I should check them as well?

I guess I would rather find this out now before installing the engine in the boat so I have easy access to everything on the engine....... Maybe this will be an excuse to get a real exhaust? Thanks........ TBF

mike tkach

iTrader: (3)

replacing the seals in the sea pump is a breeze if you have a small press and you can get the seals from any merc dealer.i recomend perssure checking the manifolds.water on the plugs while running on the garden hose indicates a pretty bad leak somewhere.is it possible that the exhaust manifolds have an internal leak,beilg from wisconson id say it is a posability.i am not sure if the 496 manifolds are better as far as reversion but the cam is pretty mild.hopefully eddie young will chime in on this.

Griff

Was this run on a stand??? If so, is it possible that the angle the engine is sitting is not the same as if it were in a boat??? That could cause water to revert more easily.

tpabayflyer

Yes, on a stand on level concrete..... I have a pair of the cast aluminum, old style exhaust angles that normally direct the flow to the Y pipe installed. Its about an 80* angle and does not seem to be much different from the angle in the Corsa CC..... My marine guy said if there is a manifold crack it will get worse when it heats up........ And I am just running on a stand with no load at all. I will check everything out tomorrow morning.

As far as pump seal goes, I am game to try to put a new seal in. Under the round grey seal where the pump wear plate rides on there appears to be a seal underneath it...... it looks like crap... if I could replace that seal I bet I would be in business. I looked on ebasic power website and saw this seal for about $10.... www.ebasicpower.com/pc/GLM85080/MERC that would be a lot better than $600+ for a new one!

tpabayflyer

Mike, I forgot to ask how would you pressure check the manifolds? I do have an air compressor....... seal up all the ports and apply air and listen for leaks????

mike tkach

iTrader: (3)

just rig up a way to connect your garden hose to the inlet on the bottom and plug off the top and turn on the water,if it comes out in the ports it,s bad.

tpabayflyer

Thanks Mike, will check back in tmrw with results.......

Griff

Or pressure it up with air to about 30psi and dunk it in water and look for bubbles.

tpabayflyer

Pulled risers and manifolds today and every exhaust port is wet......pulled plugs and cranked the motor.... Spayed wd-40 all over everything after wiping down the exhaust valves and ports and oiled the cylinders.....how in the hell does this happen? Risers were all wet inside... Checked dipstick and it's a bit milky and about a 1/8 qt higher so oil/filter gets changed pronto.....the heads I have use a raised port design and there is a mismatch on the exhaust where the manifold extends about 1/4 inch below the port. Every port had a 1/4" of water sitting in the bottom of the exhaust manifold........ What the eff??? I did not have a chance to pressure check the manifolds and risers yet but I will do iton monday if I don't get too pissed and dump this shXX it the ocean......

mike tkach

iTrader: (3)

i have no experiance useing the 496 manifolds but your cam might have reversion problems with standard 454-502 manifolds.from your above post i would say it is reversion.