Draining a Mercruiser

[dogbert]

There are 6 blue drain plugs you need to remove to drain the water out of the cooling system of a Mercruiser 350 MPI Tournament Mag.

There's one near the impeller and water pump (as shown on the rear of the engine on the port/passenger side of the V-Drive Compartment - which is backwards from direct drives):



The second one is underneath the exhaust manifold on the port side and right nearby is the one on the engine block (it'll be facing down on a brass fitting that has a sensor on it):



Then on the other side (starboard/driver) you have a similar setup - one below the exhaust manifold and one attached to the engine block:



Finally, you don't want to miss the plug for the fuel cooler...it's actually located below the fuel cooler:

[JUST-IN-TIME]

you have 7 not 6

2 manifolds
2 blocks
2 water pump
1 fuel cooler

you forgot 1!!

[rustydust]

Where is the 7th?

Where is the missing plug? You say there are two on the water pump, which one the circulating or raw? He shows the one on the hose coming from the circulating pump.

Thanks

[dogbert]

[JUST-IN-TIME]

i need the serial number because they had 3 options on motors that year

if you have the air pump or not

[rustydust]

My engine number is OL391968

[dogbert]

you have 7 not 6

2 manifolds
2 blocks
2 water pump
1 fuel cooler

you forgot 1!!

How about showing us a pic or drawing?

[JUST-IN-TIME]

im on it now

i will just show pics
i can not post the real manual, but i will give links to them all!!!

[JUST-IN-TIME]

here ya go

[JUST-IN-TIME]

also if you have replaced a water pump (newer style), not impeller you will have 8

closed cooling 7
open 6
new water pump 8


so DOGBERT, sorry i was wrong on yours

thats is why i need serial numbers, so many changes in the early years it drives me crazy!!

[dogbert]

No worries. I was pretty sure I was right because I had my dealer take me through the process.

Thanks for the pics, they are awesome!

[JUST-IN-TIME]

if you guys need a hard copy or sections, let me know i have them all since the first one ever!!

[lightning59]

Been watching the thread, appreciate the effort and pics. I wanted to be sure like everyone else. Thanks!

[Shamus]

x2...I have the fuel injected model. Very helpful guys.