4.3 Merc valve cover gasket replacement

[ShoalSurvivor]

Greetings - I found moisture around the valve cover seam. I suspect that the valve cover gasket needs to be replaced.

Questions:
This seems trivial to replace, but wanted to check to see if I'd get a "jack in the box" explosion upon removal.
Do I need to remove/reinstall the exhaust manifold to do this properly?
Should I do both at the same time?
What part number for the gasket?
What's the recommended "gasket sealant" approach?
Thanks!

original engine SN: L332123 replaced with: 2004 Mercruiser 4.3L 225hp 4bbl Quicksilver repower SN: 90004747 (#807736R11 / 03252004)
Alpha 1 Gen II - Transom: 0L517680 Drive: 0L192679 1.62 R (1.81R scratched on top) original drive may have been SN: L40356

 

[alldodge]

Yes, in most cases the exhaust manifold has to come off for clearance. Use gasket 27-827154 and torque dry to 106 in-lb

 

[Scott Danforth]

Greetings - I found moisture around the valve cover seam. I suspect that the valve cover gasket needs to be replaced.

Questions:
This seems trivial to replace, but wanted to check to see if I'd get a "jack in the box" explosion upon removal.
Do I need to remove/reinstall the exhaust manifold to do this properly?
Should I do both at the same time?
What part number for the gasket?
What's the recommended "gasket sealant" approach?
Thanks!

original engine SN: L332123 replaced with: 2004 Mercruiser 4.3L 225hp 4bbl Quicksilver repower SN: 90004747 (#807736R11 / 03252004)
Alpha 1 Gen II - Transom: 0L517680 Drive: 0L192679 1.62 R (1.81R scratched on top) original drive may have been SN: L40356

any felpro 4.3 liter gasket set available at any good automotive store would work

as for the removal of the manifold, yes, many times it is needed, however if you can get the two lower bolts out, some times you can **** it just right and pull it past the rockers.

 

[ShoalSurvivor]

Thanks, So I need to reorder all the exhaust gaskets, too.

 

[alldodge]

Thanks, So I need to reorder all the exhaust gaskets, too.

Yes, would be a good idea

 

[ShoalSurvivor]

I've got: 27-827154 for the valve cover gaskets.
Can someone verify the riser and manifold gaskets parts?

thanks!

 

[alldodge]

I've got: 27-827154 for the valve cover gaskets.
Can someone verify the riser and manifold gaskets parts?

thanks!

In post 1 you list your first motor as 0L332123 which shows all parts as
https://www.mercruiserparts.com/4-3l-gen--2-bbl-gm-262-v-6-1998-1

Exhaust manifold if one or two piece the gasket is 27-99757 (item 3)
https://www.mercruiserparts.com/bam/subassembly/31480/2694/130