Mercruiser 454 Block Drain Plug Locations

My boat is a 454 mag and i know i have 5 plugs 3 port side 2 starboard side.

Mercruiser 454 block drain plug locations.

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. 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. First season to winterize a recently purchased cruiser with rwc 454 crusaders.

Fill block with antifreeze through big hose to recirc pump. The plug i took out does not appear to be brass. Yes the drain plugs being fouled with crud and scale is common. Two on the block port and starboard sides.

Start from the highest drain and work down so you have water pouring out of all of them as you clean them. There s also a drain on the cool fuel system port side down around the bottom of the block towards the stern. Takes 3 gallons fill both hoses to exhaust manifolds takes about 1 gallon. 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.

Drain block with 2 plugs 2. Winterize your boat the family handyman easy oil drain kit quicksilver new oem blue drain plug kit 5 mercruiser br drain plugs p n block drain thre are rusted page 1 mercruiser manifold block drain plug kit michigan motorzwinterize your boat the family handymanblock drain thre are rusted page 1 iboats boating forums 552819drain plug read more. On my friends boat i could only see 4 2 port 2 starboard elbow fitting and engine block pe side.