Water in 6 & 8 only

S

stevehendo34

Petty Officer 3rd Class
Joined
Aug 7, 2010
Messages
92
Water--lots is getting into 6 and 8 only.
There was actually a 1/8 cup of so water in 6 sitting on top of the piston when I took the head off.
Cylinder wall 6 had lots rust on it 8 much less but some
6 & 8 both had low compression 60-80 lbs--rest were fine 120 of so.
Exhaust manifold ports on 6 and 8 had surface rust and water n them.

It was run recently and added a 1/4in to dip stick in 20 min. it was running fine @ idle.

I can't see any cracks anywhere. all drain plugs were left open last winter.

So I know it is:
Cracked Heads
Head Gasket
Cracked Intake
Cracked Exhaust manifolds
Cracked Block

Given that the problem is defiantly isolated to 6 and some 8 what is your guess?
 
J

John_S

Rear Admiral
Joined
Jun 21, 2004
Messages
4,269
Re: Water in 6 & 8 only

stevehendo34 said:
Water--lots is getting into 6 and 8 only.
There was actually a 1/8 cup of so water in 6 sitting on top of the piston when I took the head off.
Cylinder wall 6 had lots rust on it 8 much less but some
6 & 8 both had low compression 60-80 lbs--rest were fine 120 of so.
Exhaust manifold ports on 6 and 8 had surface rust and water n them.

It was run recently and added a 1/4in to dip stick in 20 min. it was running fine @ idle.

I can't see any cracks anywhere. all drain plugs were left open last winter.

So I know it is:
Cracked Heads
Head Gasket
Cracked Intake
Cracked Exhaust manifolds
Cracked Block

Given that the problem is defiantly isolated to 6 and some 8 what is your guess?
Click to expand...

Not sure how you inspected for cracks, but visual is usually not sufficient. Head would still be high on the list.

Assuming your boat is stearn heavy and motor has downward tilt, so water would tend to run to the back cylinders: Bad exhaust manifold to riser gasket, riser to elbow gasket, internal cracked exhaust or riser.
 
You must log in or register to reply here.
Top