1981 Mercury 150 hp v6 is it 74 degree or 60?

sk

Seaman Apprentice
Joined
Feb 25, 2010
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39
I have a 1981 mercury 150hp v6 I'm tighting my head bolts and i'm wondering if its a 74 or 60 degree block.
How do i tell which i have?
 
M

Maxz695

Guest
Re: 1981 Mercury 150 hp v6 is it 74 degree or 60?

The only advise I can offer is the degree of the cylinder angle. If you have an angle finder and a carpenters square you can level it and center it to find out.
 

Faztbullet

Supreme Mariner
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Mar 2, 2008
Messages
15,589
Re: 1981 Mercury 150 hp v6 is it 74 degree or 60?

All the Merc 2.0/2.4/2.5/3.0 liter motors are 60? motors, the only 70ish ? motor I know of is the Yammy 76?...
 

sk

Seaman Apprentice
Joined
Feb 25, 2010
Messages
39
Re: 1981 Mercury 150 hp v6 is it 74 degree or 60?

my book says 12.5 ft lb for 74 degree and 35ft lb for 60 degree v6 block, but says nothing on whats which block
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,030
Re: 1981 Mercury 150 hp v6 is it 74 degree or 60?

What book are you consulting? Never heard of a 74* V engine. 12.5 Ft-pounds is usually for a small bolt, like a 1/4-20.
 

sk

Seaman Apprentice
Joined
Feb 25, 2010
Messages
39
Re: 1981 Mercury 150 hp v6 is it 74 degree or 60?

seloc marine book. But thanks for the help i'm going to do 30ft lb
 
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