Mercruiser 454 Block Drain Plug Locations

Yes the drain plugs being fouled with crud and scale is common.

Mercruiser 454 block drain plug locations.

Drain exhaust manifolds by pulling 2 hoses 3. Takes 3 gallons fill both hoses to exhaust manifolds takes about 1 gallon. Does anyone know how many drain plugs there are for the 7 4 lx. Fill block with antifreeze through big hose to recirc pump.

When placing one of the engine block drain plugs back in after draining it would not tighten up and it appears that the threads in the block have corroded and pretty much degraded. My boat is a 454 mag and i know i have 5 plugs 3 port side 2 starboard side. First season to winterize a recently purchased cruiser with rwc 454 crusaders. The plug i took out does not appear to be brass.

Two on the block port and starboard sides. Drain block with 2 plugs 2. Drain intake line at impeller and below oil cooler pull the 4 hoses off the thermostat housing. I was going to winterize my friends boat 7 4 lx.

On my friends boat i could only see 4 2 port 2 starboard elbow fitting and engine block pe side. In the future keep a 4 6 and 8 nail handy and thouroughly have at it with the scale as the water is pouring out of the drain. Winterizing a stern drive boating 5 mercruiser br drain plugs p n 2001 baja boss 342 with 502 s serviced i have a mercruiser with mpd mercruiser 4 3l location of drain plugs page 1mercruiser 350 mag mpi drain plugs boat talk chaparral boatssingle point manual drain system mercruiser 4 3l marinesingle point manual drain read more.