Water in the engine oil

[Alister Cara]

I have a mercruiser V6 4,3 TBI with water in the engine oil. We worked on the heads and checked everyting. After rebuild it the problems persist. Any idea ?

 

[guyjg]

Cracked exhaust manifold or riser gasket. Rotted intake manifold behind the T'stat hsg.

 

[bondo]

I have a mercruiser V6 4,3 TBI with water in the engine oil. We worked on the heads and checked everyting. After rebuild it the problems persist. Any idea ?

Ayuh,... A Cracked Block is My 1st guess...

 

[o2batsea]

Get out the checkbook...

 

[87concord]

$$$$$$$$$$

 

[mastertec Tech Mercury]

When you had the heads off, did you happen to see water in around exhaust valves...

Steve

 

[chiefalen]

valley in between the heads known problem to crack there.

Pressure test the block

 

[Docksidemarineservices]

First thing, some advice for all who read this. The only time you rebuild heads if when you have an intake or exhaust valve problem. If you have water in your oil, its most likely not the cylinder heads or gaskets.

Cracked block = water in oil
Bad intake manifold = water in oil
Bad manifolds and or riser = water in cylinders definitely and possible water in oil eventually.

 

[Alister Cara]

We did rebuild the heads and we needed to changed the intake and exhaust valves. After that, we still have water in the engine oil. At this moment we identify a bad port manifold. We will change it to see if we will resolve this big problem

 

[Alister Cara]

Yes and we replaced all the valves

 

[Alister Cara]

That was the aspect of the head

 

[Docksidemarineservices]

A rebuilt long block is around 1400.00