Mercruiser 5.0 manifold maintenance.

[PGALLAGH]

Removed, sanded, cleaned, and painted my 2005 mercruiser 5.0 dry joint manifolds. Shop wanted $2500 to replace, but after disassembly, not bad at all!!! Now I am wondering if I can reuse the gaskets between manifolds, spacers, and risers. New are $120 for the set of 4. Can they be reused with a high temp RTV copper gasket maker bead on each surface?

 

[achris]

Re: Mercruiser 5.0 manifold maintenance.

Removed, sanded, cleaned, and painted my 2005 mercruiser 5.0 dry joint manifolds. Shop wanted $2500 to replace, but after disassembly, not bad at all!!! Now I am wondering if I can reuse the gaskets between manifolds, spacers, and risers. New are $120 for the set of 4. Can they be reused with a high temp RTV copper gasket maker bead on each surface?

No, no, no, no, no, no, no and NO!

Consider yourself lucky... I have to pay $120 EACH for those gaskets....

Chris.........

 

[PGALLAGH]

Re: Mercruiser 5.0 manifold maintenance.

A simple oil drip has cratered into a new impeller, gimbal bearing, and bellows rebuild, an engine removal and oil pan replacement, and thankfully NOT a new set of manifolds. I guess I can suck up another $120. Thanks for the voice of reason.

 

[PGALLAGH]

Re: Mercruiser 5.0 manifold maintenance.

Update, just found replacement gaskets on ebay for above and below each metal gasket(that you reuse), for $5.99 per metal gasket, total of $24 for the whole job.

A simple oil drip has cratered into a new impeller, gimbal bearing, and bellows rebuild, an engine removal and oil pan replacement, and thankfully NOT a new set of manifolds. I guess I can suck up another $120. Thanks for the voice of reason.

 

[achris]

Re: Mercruiser 5.0 manifold maintenance.

Update, just found replacement gaskets on ebay for above and below each metal gasket(that you reuse), for $5.99 per metal gasket, total of $24 for the whole job.

Post a link, they may be the wrong gaskets... I've never heard of a gasket for the metal plate...

 

[PGALLAGH]

Re: Mercruiser 5.0 manifold maintenance.

Mercruiser Dry Joint Exhaust Riser Gasket 27 864850A02 27 864547A02 27 864549A02 | eBay

 

[achris]

Re: Mercruiser 5.0 manifold maintenance.

Yep, that look like the right gaskets for the dry-joint system... I'm not sure I'd trust them though. Let us know how it works out for you.... If they don't leak, might be worth me getting a few sets....

Chris........

 

[Don S]

Re: Mercruiser 5.0 manifold maintenance.

There are 4 styles of that gasket, and the cheap thing you are looking at can only be used between the exhaust elbow and a extension riser. NEVER between a manifold and the elbow, or between the manifold and the extension riser.

 

[PGALLAGH]

Re: Mercruiser 5.0 manifold maintenance.

There are 4 styles of that gasket, and the cheap thing you are looking at can only be used between the exhaust elbow and a extension riser. NEVER between a manifold and the elbow, or between the manifold and the extension riser.

So I can use the ones I bought between the riser and elbow, and found the metal dry joint gasket for $23 on eBay for between the manifold and riser. Thanks guys!

 

[Don S]

Re: Mercruiser 5.0 manifold maintenance.

Are you buying the right ones? That's the question.

We have no idea how your cooling system is plumbed.

View attachment dryjoint gaskets.pdf

 

[PGALLAGH]

Re: Mercruiser 5.0 manifold maintenance.

I have a 2005 mercruiser 5.0, 220 hp, serial num 0w049629. It has 2 gaskets each side, one with open holes between the riser and elbow, and one with a restrictor between the manifold and riser. Boat lives in the driveway, but plays in the ocean.

 

[achris]

Re: Mercruiser 5.0 manifold maintenance.

There are 4 styles of that gasket, and the cheap thing you are looking at can only be used between the exhaust elbow and a extension riser. NEVER between a manifold and the elbow, or between the manifold and the extension riser.

I think he intends to scrape off the old gasket and re-use the metal plate, using those cheap *** gaskets... Personally, not what I'd do. I'm all for saving money (I just paid $61 for the trim pump reservoir from the OEM (Parker-Oildyne), Merc want over $200 for it in Australia ), but not if the possible consequence is a stuffed engine...

Chris.......