4.3 Mercruiser with only 3 water drain holes.

jayhuf

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Joined
Oct 18, 2020
Messages
1
Ok, so I have a weird question. Has anyone else seen a 4.3 mercrusier with only 3 drain holes. I have 1 on each manifold hose (blue plastic) and one on the starboard block (brass). I can't find anything on the interwebs. I looked everywhere for the 4th plug using a mirror and flashlight. Manual says 4 plugs but only shows picture of port plugs.
 

alldodge

Moderator
Staff member
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Mar 8, 2009
Messages
40,581
There is one on the port side
and should also be brass
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
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Jul 23, 2011
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47,297
And if its 1996 and newer, there is one on the intake manifold T-stat cross over
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,036
V engine blocks almost always have a drain on each bank of cylinders. Your 4.3V6 should have a drain under each exhaust manifold.
 
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