It is vital for your boat exhaust manifold to be changed every few years, so that it doesn’t produce hot spots within the engine. This will result to serious internal damage to the engine that will then imply a costly overhaul or engine replacement. Changing your boat exhaust manifold can usually be an easy enough job, if you have the proper tools and your repair manual.
Step 1: Take off Bolts for Boat Exhaust Manifold
Unlike your vehicle’s engine, you have a fairly easy access to the boat exhaust manifold. The moment the engine compartment is opened up, you will observe the exhaust ports on the side. All that is required is to remove a few bolts on the exhaust manifold itself to take it off. Use an open ended wrench in loosening the bolts. The moment the bolts have been removed, you will be able to take out the exhaust manifold. Ensure to put aside the bolts, so you can make use of them again.
Step 2: Inspect Exhaust Manifold Gaskets
When you are replacing the boat exhaust manifold, chances are that you will have to chage the gaskets also. However, this is not always the situation. Take some time to check the gaskets, to observe if they are still in workable condition. Inspect for how they fit, if the holes rightly line up, and if there are any tears. If you observe any, then you will need to change them.
Step 3: Take off Manifold Gaskets
Taking off the exhaust manifold gaskets is the area of the project that will take the most time. You have to be very careful when scraping off the material, so you do not spoil the aluminum housing. Use a plastic scraper to remove the small pieces of exhaust manifold. Ensure that you only scrape in 1 direction, to lower the possibility of scratches.
Step 4: Mount New Gaskets
The moment the old manifold gaskets have been taken off, you can mount 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. Check carefully at how they fit, and how the different holes line up. Any exhaust leaks will reduce your engine’s power, so you want to ensure 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 position. Without disturbing the gaskets underneath, put the new exhaust manifold onto the engine. Hold is steady in position, and thread the bolts into the correct holes. Start at 1 corner, and tighten until it is snug. Then move to the opposite corner. Continue alternating bolts until they are all snug. Then,again tighten them all one-by-one.
Step 6: Run your Boat Engine
The moment the new boat exhaust manifold is tightened in position, start the engine and allow it come to operating temperature. This will seal the exhaust gaskets into position, so they will fill any gaps left by air. Inspect to ensure there aren’t any exhaust leaks. If not, change the engine compartment cover and make sure you enjoy the boat for the summer.