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This is on a Ford 5.8 Ltr with an OMC OD. Have you cleaned and resurfaced exhaust manifolds? I have a few other posts about this. The motor was running hot but only on the port side exhaust and riser. The engine temp was right in the middle. On removal, there was rust and a partial blockage in...

I'll find that Permatex gasket remover. Thanks for the tip.

Yes, I'd use the double nut method to remove them.

Bondo and Lou, thanks for the tips. Should I soak the gaskets with a Goo- Gone or something similar for a few days to soften them up prior to trying to remove them and cleaning up the surfaces? I could also start with a hard plastic scraper/putty knife and then only use a razor blade as...

Picture please. Wouldn't you have to be very careful not to go too deep and create a low spot that doesn't seal?

I think that you mean cleaning the block, right? You had earlier said that the exhaust manifolds must be replaced. What would you suggest for cleaning the engine block and the mounting surface?

Here are pictures of the starboard side. Any comments or observations?

I'm replacing the risers/elbows and exhaust manifolds on a Ford/OMC Cobra 5.8 Ltr I started this with the post: "Overheating Possibly Caused by Restricted Thermostat Housing Port". Now I know that the thermostat housing may have been contributing to the overheating but I will change the risers...

I'm planning on changing the impeller anyway, so if spinning it dry for a few turns hurt it, no big deal

Update: I did the compression check: All spark plugs Removed, the lead to the coil disconnected (and protected with electrical tape). No water connected. Throttle wide open, and carb held open with a screwdriver. I left the fuel pump connected. Around 6 cranks of the engine to get a steady...

I'm in saltwater, Southern California. This boat was in a lake for the first 21 years, then in a saltwater marina for 4 years. I've had it for 9 years. I keep it on a trailer and always flush it out after use. I have also been using Salt-Away for the last 5 years. The risers were pretty rusted...

5.8 Ltr Ford, OMC OD. 1991 I'm changing the risers/elbows. I already have those. I am considering replacing the exhaust manifolds as well. The motor has been running fine. It starts easily, has plenty of power, and doesn't burn oil. Just to be sure, if there were cracks in an Exhaust Manifold...

Can I do a Compression Check with the Risers Off? 5.8 Ltr Ford. I removed the risers (Elbows) because I will replace them. (See other post "Overheating Possibly Caused by Restricted Thermostat Housing Port") I'd like to do a compression check before I spend a lot of money. The boat has been...

I don't know what you mean by "2XS with bondo". Why would the manifolds cost me a new engine? I am planning on changing the Elbows/Risers. If I file the manifolds flat why wouldn't they seal? I will look for a metered bypass hole for the thermostat, but how sure are you that there is one...

Here are pictures: The first one shows the green material. The next 2 show the manifolds after cleaning them up as best I could.

91 5,8 Ltr OMC/Penta V8. I'm changing the Elbows/Risers. I was overheating only on the port side. See other post I'm cleaning the mounting surface on the top of the exhaust manifold where the gasket will be, and on the port side there is a very hard sealant or something. BTW, that is the side...

I'm cleaning the mounting surface on the top of the exhaust manifold where the gasket will be, and on the port side there is a very hard sealant or something. BTW, that is the side that was overheating. The sealer (?) is lime green and comes off with a lot of scraping. Could it be a filler used...

One of the suppliers says his fits a 5.7 but 19192 and on. My boat is a 92 but with a 91 motor: Ford 351 Cu In Model 584APLRGD Serial No. T01224704 Did something change in 92?

Lou, thanks, you have been a great resource for years. I have not been on since the gimbal bearing/ housing/ bellows repair a while ago. She has been running well. The exhaust manifolds look better than the elbows but I will try to clean them out. I can prevent large pieces of rust from falling...