Petty Officer 1st Class
- May 7, 2013
After several years of restoring my 1988 Sylvan bow rider, Saturday finally came the big moment of truth. After some earlier preliminary quick dry starts to see if the 4.3 ltr engine actually fires up, which it did, Saturday was the day to see if it actually runs normally for at least 1/2 hour. I hooked up the water supply (see picture 1) and started her up. I expected it not to be perfect and some touch ups needed to be done, but that 1/2 hour gave me enough time to set the timing, adjust the idle mixture screw and check all of its vital signs of being alive and hopefully well. It all actually came out pretty darn good, I must say. Some smaller shortcomings need to be taken care of but that's beside the point for right now. But to my disappointment, about 20 minutes in to the run I discovered about a teaspoon worth of water on top of the intake manifold where bolt #7 is (see picture 2). Now that was not good. I stopped the water, turned off the engine and took a deep breath. A few minutes later I checked the oil to see if I had water in the oil or if it was milky. Oil was clean and pure. I called it a day, I need to do some thinking. This Sunday morning I pulled the plugs on cylinder #3 and 5 wondering if water also dripped into the cylinder and would cause a hydro-lock. I cranked the engine and it cranked just fine expecting to see moisture coming from either one or both cylinders, but nothing. They were nice and dry. I put a piece of paper in front of the spark plug holes to catch any squirts, but the paper was dry. Can anybody tell me what has happened here? I looked in the manual to recheck if I did something wrong when I put the engine back together, but I didn't see anything I might have overlooked. Now, I have seen some engines maybe even the GM 4.3 ltr engine (I think one of the studs holding the water pump) where a stud will actually go through the wall in to the water passage and must be installed with a sealant. The manual doesn't say anything that the intake manifold bolts must be embedded in sealant. Does anybody have an idea what is going on here. Should the intake manifold bolts have sealant on them?