Water in cylinders in a GM Vortec 4.3

[Imanol]

Last year I changed my old Mercruiser 4.3 LX. I bought a GM Vortec 4.3 and place it instead the old one.<br />After 30 hour runing last summer, I realize that there was water in oil. Sometimes I had problems when I tried to start the engine because it was water in any cylinder. I took out the engine and sent it to my suplier.<br />He told me that the problem was a bad Timing.<br />They repaired and send me again the engine.<br />This year I have instaled the engine by second time with new longer risers to be sure that the problem wasn´t the water line. I have checked the timing and it has been running during 10 minuts. Water has appeared in one cylinder.<br />¿How can I make a good timing in this engine?<br />Thanks.

 

[Olds Eddie]

Re: Water in cylinders in a GM Vortec 4.3

You either have a problem with the riser gaskets or possibly a cracked block. Also is this a marine engine. The cam timing and valve opening events is different on a marine engine or it will pump water up the exhausts.

 

[rodbolt]

Re: Water in cylinders in a GM Vortec 4.3

what ign system are you running? and timing, unless its way off should not affect water intrusion. which cyl is getting water in it?

 

[Imanol]

Re: Water in cylinders in a GM Vortec 4.3

The ignition system is Thundervolt IV. Last week we found water in cylinder Nº4.But we have found in Nº 2 before. How can I check that the timming is OK? The riser, exaust manifolds and gaskets are new.

 

[Don S]

Re: Water in cylinders in a GM Vortec 4.3

This Mercruiser service bulletin may help.<br /><br /> http://www.boatfix.com/merc/Bullet/01/01_13.pdf <br /><br />To set your timing, you turn the distributor till the the proper timing marks are aligned on the front of the engine while viewed with a timing light.