Winterizing a Merc A1-G1 Block Question Antifreeze

[Pmt133]

Which engine do you have? In-line 4, V6 or V8?
The block drain on the 4 is on the side under the manifold
On the V engines there is one drain on both sides of the block, in front of the starter on the starboard side & in front of the oil filter mount on the port side. For the manifolds it can be on the underside or on the end it all depends on the brand of manifold. Don’t forget in addition to that you have to disconnect the bottom end of the big hose in front between the front circulating pump & the thermostat housing that holds a fair amount of water….probe the holes with a pick or small screwdriver…

FYI, some hoses have a drain plug and fitting on the circulating pump hose as well. Found that out when reassembling the cooling system with new parts.

 

[1985 Century Mustang]

Which engine do you have? In-line 4, V6 or V8?
The block drain on the 4 is on the side under the manifold
On the V engines there is one drain on both sides of the block, in front of the starter on the starboard side & in front of the oil filter mount on the port side. For the manifolds it can be on the underside or on the end it all depends on the brand of manifold. Don’t forget in addition to that you have to disconnect the bottom end of the big hose in front between the front circulating pump & the thermostat housing that holds a fair amount of water….probe the holes with a pick or small screwdriver…

1985 Merc A1-G1 140 HP

 

[1985 Century Mustang]

I'm wondering if I have drain plugs on both sides of my engine now. Anyone?

1985 Mercruiser A1-G1 3.0 140hp.

 

[Pmt133]

There should be a drain petcock on the block on the exhaust side and then one toward the rear underside of the manifold. Picture half a small block....

 

[1985 Century Mustang]

There should be a drain petcock on the block on the exhaust side and then one toward the rear underside of the manifold. Picture half a small block....

Yes, but the peacock drain seems like it was sealed shut. Could the factory have done that or the owner prior... I tried using a probe but to no avail. It's sealed shut inside. The valve too. Looks Ike someone used a jb weld inside the block and inside the peacock stem.
.

 

[1985 Century Mustang]

Also when I tried putting antifreeze in, it all drained out to the rear transom exhaust, outside of the boat.

 

[Lou C]

You’re taking about the block drain, correct?
When you fill with AF for the block you disconnect the big hose between the circ pump & stat housing at the top end (this is after draining from the bottom) till the AF comes out the neck on the stat housing for the big hose. You have to get the block to drain! Post up pix of what you have there…

 

[1985 Century Mustang]

You’re taking about the block drain, correct?
When you fill with AF for the block you disconnect the big hose between the circ pump & stat housing at the top end (this is after draining from the bottom) till the AF comes out the neck on the stat housing for the big hose. You have to get the block to drain! Post up pix of what you have there…

Thanks, I'll check it tomorrow

 

[Scott Danforth]

I'm wondering if I have drain plugs on both sides of my engine now. Anyone?

1985 Mercruiser A1-G1 3.0 140hp.

Not on a 3 liter

 

[Scott06]

I'm wondering if I have drain plugs on both sides of my engine now. Anyone?

1985 Mercruiser A1-G1 3.0 140hp.

No only one block drain and a manifold drain. Other Side of the block has the lifter galley no drains. I had a 3.0 for 20 years, Makes it very easy to winterize.
if your drain is plugged on that side get the peacock out and figure out a way to open it so it drains otherwise you will be looking for an engine in the spring