Block coolant drain plugs.. How many?

[groundhogyh]

On MD6A is there more than one?
RbSent from my iPhone

 

[perry_basden]

The MD6 air filter has a cleanable element permanently installed in the air
intake assembly. It is basically a mesh of steel similar to steel wool.
The air intake assembly should be washed regularly with solvent and then
re-oiled with a light weight oil to aid in trapping the dust.

The only engine drain plug is situated on the left side of the engine, near
the oil dip stick. Most engines have this drain made by screwing together
two separate fittings. One is an angled piece into which the drain valve is
attached. If you remove the drain valve first, the angled piece can be
removed from the block. It is then possible to ream the drain passage with
a long, small diameter twist drill should it be clogged with debris. The
drain passage connects in a straight line to the passages in the head.

I can forward pictures of both of the above items to anyone who may be
interested.

Best regards

Perry Basden
Windsor, Ontario

 

[groundhogyh]

Thanks Perry for the response..

I was working on this yesterday and was able to unscrew the drain plug assembly from the block.

What I found up in there was like very black black clay type stuff. I am thinking it is some old Chesapeake bay mud which is very dark and fine and sticky.

I got the wire to go up into the block about 3 inches where it seems to get stopped. But still couldnt break through to water. So it is still clogged.

This morning, I purchased some adaptors so I can connect a garden hose to the port. Maybe I can blow it loose.

So I need some oiled steel wool for my air filter? Mine has the metal screen, but I don't think there is anything else in there.

Roy

 

[perry_basden]

Hi, Roy.

I'd try a long twist drill and turn it by hand to ream the drain hole. If
you connect a garden hose to the port it may break the gunk free only to
lodge somewhere else in the cooling system.

The air filter that I was looking at over the weekend has an expanded metal
screen which prevents the coarser material from being drawn into the engine
should it become clogged with debris. The material in the air filter is
much coarser than steel wool... I used this description for clarity.
Perhaps I misled you in this respect. The whole air filter housing,
including the expanded metal screen and the coarse material can be washed in
solvent and then blown dry for cleaning. Generally speaking, the air intake
in a boat doesn't get the dust that an industrial or agricultural engine
would ingest. Once the unit is cleaned a dousing with light oil will trap
any dust that is present during operation.

The advantage to this type of filter is that it can be serviced almost
anywhere in the world.... while pleated filter elements have to be had from
the manufacturer... a difficult proposition in far off ports.

Another type that I have seen is a foam sleeve which fits over the intake of
the engine. These are also able to be washed and oiled for reuse.

Regards

Perry