1993 5.0 l Ford OMC Cobra Riser, these look o.k.?

[holgo123]

Since I have everything apart and am getting ready to install a rebuilt engine, should I take the exhaust manifolds/risers apart and inspect and replace the gaskets? They look good without any signs of leaking... The boat has about 300 hours on it... I don't want to do it if uneccesary...

 

[Bondo]

Re: Maintenance Question, 1993 5.0 l Ford OMC Cobra

Re: Maintenance Question, 1993 5.0 l Ford OMC Cobra

Ayuh,.... I would.....

And,..
If the gasket mating Surfaces are at All compromised,...

I'd replace'em.....

 

[holgo123]

Re: Maintenance Question, 1993 5.0 l Ford OMC Cobra

Re: Maintenance Question, 1993 5.0 l Ford OMC Cobra

I took them apart and cleaned the old gaskets off... That was a chore... The mating surfaces look nice after I got all of the gasket material off... What kind of gasket sealent do you use on them? I have some VersaChem Gasket Sealent/Super Tack. Can I use it?

 

[holgo123]

Re: 1993 5.0 l Ford OMC Cobra Riser, these look o.k.?

Do these risers and manifolds look o.k.?

 

[bjcsc]

Re: 1993 5.0 l Ford OMC Cobra Riser, these look o.k.?

They look good to me. In fact, that's about as good as they can look. Check them to make sure they're flat and run a tap into the threads to clean them up (be careful not to bottom the tap out and break it off). I use Permatex Hylomar HPF. I don't like the new metal coated gaskets that don't require sealant. While they seal just fine, they do so in such a small amount of the mating surface area that the rest of it degrades. I checked mine after a year because I never fully trusted the new gaskets when they came out. I went back to the old style with sealant after I saw what they were doing to the mating surfaces - YMMV...