Question about Boating
How do I replace exhaust maifold gasket on 2.0 liter, 140 hp GM mercruiser boat motor?
Locate the exhaust manifold, there will be 8 bolts attaching it to the engine block. Remove these bolts, they may need penetrating fluid to loosen them. Slide the manifold off the exhaust studs.
Remove the gaskets, scrub where they have been with a wire brush and refit new ones. Use some gasket sealant to affix them and replace the manifold. Start at the middle studs and work outwards in a criss-cross formation.
Torque up the studs to the correct settings (check the manual) and don't overdo it as you could crack the cylinder head (been there done that).
Start the motor and check for any leaks around the manifold, if so, check gaskets again for a good seal then try again.
Hope this helps and please vote for me :)
Posted on Jul 13, 2010
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Posted on Jan 02, 2017
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