Mercruiser 5.7 block drain plug size

[jthor3277]

Good day -
Would anyone happen to know the engine block drain plug size for a Merc 5.7L? I removed them last winter and I don't know where they went!

 

[Don S]

Re: Mercruiser 5.7 block drain plug size

If you are referring to the brass pipe plugs that fit into the block, they are 1/4" NPT.
Or are you looking for the blue plastic plugs?

 

[jthor3277]

Re: Mercruiser 5.7 block drain plug size

I was looking for the Brass pipe plugs. I don't have the adapters in my block for the blue plugs. Thanks as always!

 

[Bondo]

Re: Mercruiser 5.7 block drain plug size

I was looking for the Brass pipe plugs. I don't have the adapters in my block for the blue plugs. Thanks as always!

Ayuh,... 'n That's a Good thing,...

 

[jthor3277]

Re: Mercruiser 5.7 block drain plug size

Hi Bondo. Just curious to why that is?

 

[edthecritman]

Re: Mercruiser 5.7 block drain plug location

Re: Mercruiser 5.7 block drain plug location

I cannot find where all 5 plugs go - can you help me?

 

[Bt Doctur]

Re: Mercruiser 5.7 block drain plug size

best to start your own post next time. not knowing the year or serial number I`ll guess 2 go in the block, 2 in the manifolds.the 5th?
start it and see where water leaks out of.

 

[Bondo]

Re: Mercruiser 5.7 block drain plug size

Hi Bondo. Just curious to why that is?

Ayuh,... 'cause the blue plugs are plastic, 'n break off,...

A brass plug with wrench flats, Won't...

 

[edthecritman]

Re: Mercruiser 5.7 block drain plug size

Thank you - 1997 serial # ok171706

 

[Don S]

Re: Mercruiser 5.7 block drain plug size

As mentioned before edthecritman, you need to start a new thread of your own with your information. This thread is about jthor3277's question.