Bought some new (reman) heads.

F

Fish Guts

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After all the problems I had with my starboard side head, i decided to buy a pair of rebuilts heads. Went down last night to disassemble, and this is what I found. All plugs looked good except #7, it had milky oil on it. I figured another head gasket, no biggie, I'm changing anyway. WELL, pulled that head and this is what I found.

IMG_20140818_190917.jpg


Here's a link to a bigger pic.
http://s24.postimg.org/chhgsnnd1/IMG_20140818_190917.jpg

Now, I know a rebuild, or at least partial is in order. I don't want to pull the boat out now. I can still enjoy it at the slip for the rest of the season. BUT, what could be the worst that happens if I put it back together to take short runs for the rest of the year.

So, whatchya all think?
 
Depends on what broke off to cause all the damage. Ring, plug? Can't quite tell if the top of the cylinder broke. Something hard sure rattled around in there.

Rotate the piston down and carefully inspect the cylinder walls for anything from cracks to scouring from broken ring. Carefully run a file across the head to see what that reveals. Curious what the ex valve looks like.
 
Charlie,plug was fine, actually I changed them 3 times since I've had the boat, never missing pieces.The cylinder looks fine so far, haven't turned the engine to get the piston down yet. The piston is definitely missing a piece. Here's a pic of the valves, they do look frozen.It does look like the gasket blew.

IMG_20140819_175350.jpg


Larger pic...

http://s30.postimg.org/qzti7csjl/IMG_20140819_175350.jpg

I'll head down tomorrow to turn the engine.
 
Ended up going down to the boat tonight. Turned the engine to get the piston down. I still see the top ring in and the cylinder wall is actually very smooth, no gouges or nicks at all. I tested compression on all cylinders just a couple months ago and this #7 was around 150.

Not a good pic but...

IMG_20140819_185527.jpg


link to full size.

http://s24.postimg.org/8r3q9rrwl/IMG_20140819_185527.jpg

I'm thinking this was an existing problem and may be okay for the rest of the season, but I'd like some more opinions.

Thanks,
 
Looks like the gasket is bad and rusted the innards and doesn't look like that cylinder has been firing.

150 PSI is good...but as long as you have the head off and you have a valve compressor. I'd atleast pull the springs on that cylinder and get some medium grit compound, smear a little on the valve face and put the valve stem (while it's still in the head)in a drill and just pot slight upward pressure as you rotate the valve. Check after the first couple revolutions to see if there is an even pattern. Then continue to lap the valve. Maybe 20 revolutions or so or until you get an even surface between the valve and seat.
 
Charlie, I have rebuilt heads to put on, this is the old one. I also have all new lifters, push rods and rocker arms. I will do another compression test when it is together before I start it up. Do you think the piston is okay like that for now?

Thanks,
 
Is that a piece missing from a bolt or coolant hole.
 
Bruce, I'm not sure right now, will check when I get home from work.
 
I recently did the heads on my boat, was able to get them rebuilt locally. Lots of labor and $200 gasket set is what you have to lose if you put it all back and run it this season. Your call but like you, I did not want to interrupt my boating season so I just did-it in the water.

If the ring is not compromised and you *just* have a chip from one cylinder, with good compression, I'd put it back together and run it, see the compression numbers and maybe never fix it. What year boat, how many hours, etc?

You can also buy time to save/shop for a re-manufactured engine in case you want to go that route.
 
Yeah Walshie, I remember your thread. I ended up buying online from Allied Motor parts in GA. I'll have the old ones rebuilt for spares... Did you also replace the lifters, rods and rockers? The boat is an 88, but I have already restored most of it so I will be keeping it a while.

Thanks,
 
The heads are the most expensive single item in a re-power/rebuild. You already got the heads and components. the rest should go smoothly...but you never know until you get in there.

Will the engine work OK if you put it back together and run it? Hard to say until it's cleaned up to get a close up look at the damage and what caused the damage and will running cause more damage. I guess it comes down to 'How lucky do you feel"
 
No, I did not replace those parts. just valves and springs
 
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