The motor we will be discussing here is a 4.These single cylinder Mercurys were in production in.Best sealant for outboard motor mounting boltsposted 0.PM ET US. Use Boat Life brand Life Caulk, thoikol based polysulfide caulking, the stinky, super sticky, stuff.This is rated for underwater use, and far better than any silicone product.Use Mercurys installation technique of bolt heads outside on bottom bolts, bolt heads inside on top bolts.There is a reason for this.The bottom bolt holes need better sealing, since they can be under water continuously, and have no washer to aid seal at hull.How To Install Mercury Outboard Water Pump' title='How To Install Mercury Outboard Water Pump' />To install the engine, first push bolt through lower engine holes or slots and hold in place, then apply sealant all around the bolt shanks not threads, then push engine up against boat, pushing in bolts at same time, twisting as you go. Install Certificate In Isa Server 2006 Enterprise . This will totally seal the bolt hole under the engine lower holes or slot, where no washer is possible to help accomplish and compress seal.The sealant has to do it.Before you do this, you can also then have the top bolts, also with sealant pre applied to the shanks, pre installed in the upper holes, using a transom stiffener bar if you wish.Put a ring of sealant around those on the outside too, before the engine is moved against the boat.More than one person is required to do this right, so bolts dont move out of holes once caulked.Mercury outboard water pump kit for lower unit.Video shows how to replace impeller and install full kit.This video will show you have to remove the lower unit and change the water pump impeller on a Mercury outboard motor.I did this on a 1984 20hp Mercury.Shop from the worlds largest selection and best deals for Mercury Outboard Engines Components.Shop with confidence on eBay
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