What You Will Require
It is vital for your boat exhaust manifold to be changed every few years, so that it does not cause hot spots within the engine. This will lead to serious internal damage to the engine, which will then imply a costly overhaul or engine replacement. Changing your boat exhaust manifold can be an easy enough job, if you have the right tools and repair manual.
1: Take out Bolts for Boat Exhaust Manifold
Unlike a vehicle’s engine, you have fairly easy access to the boat exhaust manifold. Once the engine unit is open, you will see the exhaust ports on the side. All that is required is to remove a few bolts on the exhaust manifold itself to remove it. Use an open ended wrench to loosen the bolts. Once the bolts have been taken out, you will be able to remove the exhaust manifold. Make sure to put aside the bolts, so you can use them again.
Step 2: Check Exhaust Manifold Gaskets
When you are changing the boat exhaust manifold, chances are that you will be required to replace the gaskets also. However, this is not always the case. Take some time to check the gaskets, to see if they are still in workable condition. Check for how they fit, if the holes line up, and if there are any tears. If you notice any, then you will need to change them.
Step 3: Remove Manifold Gaskets
Take out the exhaust manifold gaskets is the part of the project that will take the most time. You must be very careful when scraping off the material, so you do not spoil the aluminum housing. Use a plastic scraper to take out the small pieces of exhaust manifold. Make sure that you only scrape in 1 direction, to lower the possibility of scratches.
Step 4: Install New Gaskets
Once the old manifold gaskets have been removed, you can install the new gasket kit. Dry fit all of the gaskets, to ensure that the kit you have is the right one for your boat engine. Look carefully at how they fit, and how the different holes line up. Any exhaust leaks will lower your engine’s power, so you want to make sure the gaskets fit perfectly. Apply some gasket sealer onto the manifold and set the gaskets in position.
Step 5: Mount Boat Exhaust Manifold
Put the new exhaust manifold in place. Without disturbing the gaskets underneath, put the new exhaust manifold onto the engine. Hold is steady in place, and thread the bolts into the correct holes. Start at 1 corner, and tighten until it is snug. Then go to the opposite corner. Continue alternating bolts until they are all snug. Then, tighten them all one-by-one.
Step 6: Run Boat Engine
Once the new boat exhaust manifold is tightened in position, start the engine and let it come to operating temperature. This will seal the exhaust gaskets into place, so they will fill any gaps left by air. Check to ensure there aren’t any exhaust leaks. If not, change the engine compartment cover and enjoy your boat for the summer.