As I started unbolting I continued to get water coming from # 8 cylinder. There are 3 rows of bolts holding the head and the lowest bolt nearest the transum poured out a lot of water when I puled it out. A lot of water. The other thing is I can see two areas in the kead where there seems to have a chunk missing. One is next to a push rod sleve of # 8 and another area at the # 4 pushrod areas. Not sure if this is normal. I tried to get the best pics of this stuff. Hope it can make sence to you guys.
Here are the pics of the port side tare down. I see there are the same voids in the port side head , in the same place so I guess they are supposed to be there.
#8 does show some water ingestion,examine the heads closely for cracks or send them out to be checked for a cracked seat on the exaust valve.
One pic caught my attention .Just by removing the head you should not have left any milky residue. Chevck this area for a crak at the very top of the bore. Use a cotton ball. If it leaves fibers ,that a crack.
Thanks doc. That was a bit of slime that driped in as I plucked off the head. Heaviest head I ever handled. I had to hold it on end to hand off to my son outside the boat. I did the cotton swab test and nothing. I also took a high powered magnifying glass and looked over everything and cant find a single crack. I will be sending the heads in for a look. Thanks for that advice . As far a compression down in 8 and 5 I think head gasket or valve. Maybe.
Do the riser and manifold surfaces look suspect? In my extensive reading that is the most obvious place to get water comming in.
Please weigh in with all your comments. They are not only wanted but needed.
Thanks again Doc.
I cleaned up the starboard head and it looks good from the outside and flat to my 24 inch snapon straitedge. I cant find my spring compresser so only checked for cracks where I could and saw nothing. I also cleaned up one kodiak exaust manifold ( aluminum ) along with the matching imco riser ( stainless ). When I look down the throat of the manifolds it devides into two sections, front and back. I see no signs of water in the manifolds just a nice coating of carbon. Also the top of the manifold where it joins the riser is in bad shape. Very uneven and pitted. The other thing I saw was the manifold has 4 slots to handle water where the riser has just two. Reading the merc buliten it said that if the gasket comes off without having to scrape it there is likely a leak. The gasket came off the port side easly and fully intacted. The starboard crumbled a bit but needed very little scraping. The risers both are high around the perimiter when I applied the straitedge. In addition the gaskets have all 4 slots cut out. INMO i cant see how this was a proper seal.
How did the intake manifold gaskets look? What about the torque of the intake manifold bolts, were they tight? maybe around 45 ft/lbs or loose? I remember changing a lot of intake gaskets because of coolant leaks from the intake manifold coolant crossovers into the engine back in the day when I twisted wrenches on cars and trucks. Just a thought.
Just an observation that might help. Your head gaskets look to be deformed. (not perfectly round around the cylinders) Or it may be just the picture. It almost looks like they did not seal correctly and were blown out of round from the compression.
Yes Paul they are out of round. I saw that right away but they are all out of round the same so I dismissed it as the way they were made. Good point I will have to check into this. When I took off the starboard head I saw the small area bettween the # 8 and #6 a bit twisted. I have been thinking that maybe if I re-gasket everything,make sure nothing leaks I may be ok. It sure doesnt look like I broke anything. I think pressure testing components will be my next project, along with getting the heads checked out by a shop. When I get new head gaskets I will post a pic and we will see if they are out of round.
Thanks.
Just noticed that some of the water holes in the head are covered up by the head gasket. Any ideas why that would be? Any idea what the result of this would be?
intake may have not sealed by looking at the gasket. # 4 may have been pushing exaust into 5 That may explain 5 being down. I will keep looking but for now the heads are in the shop getting a look see.
found the problem. When I took the heads in they tested fine under vacume. But upon closer examination the head gaskets did not sit corectly on the head. The previous owner had the heads worked and it looks like they ground off too much near the # 8 exaust port making a gasket ring partialy sit into the chamber and not sealing properly. new heads being installed on monday. Along with new intake. Took engine out today to make sure all will be buckled in good.
