Originally Posted by wetwhistle (Post 3410372)

Wouldnt there atleast be a ruff idle if it was a valve spring? And how could I go back and run it for 20 minutes and it was running completely normal?

Originally Posted by wetwhistle (Post 3410913)

So I cranked the motor over without firing and didn't hear a thing. I tried turning it over by hand and still didn't hear anything rattling. How would the flywheel bolts come out with the coupler over it.

Any Ideas??

Originally Posted by wetwhistle (Post 3410913)

So I cranked the motor over without firing and didn't hear a thing. I tried turning it over by hand and still didn't hear anything rattling. How would the flywheel bolts come out with the coupler over it.

Any Ideas??

Originally Posted by 4bus (Post 3411144)

Sounds like you are looking for a simple answer, I don;t think you are going to find it here.....however talk around and soon enough someone will tell you to just run it and maybe you will feel better???? :lolhit:

Bottom line is you have a BLUE engine, yes Merc racing......very well known for breaking valve springs. You are 150 hours over the service mark, and when it drops a valve at 5000 rpm you are going to haver huge problems.

Find a good builder to freshen that engine and pressure test those CMI's. While it is out you will have a clear look at everything else that should be inspected IE: Coupler, flywheel, gimble bearing, u joints, pulleys, and sea pump.


Not sure what your noise is, but at 400 hrs consider it a warning shot form the boating gods......believe it or not they may be trying to save you money. :grinser010:

Originally Posted by wetwhistle (Post 3411153)

I know I know. It is getting valve springs tomorrow. The reason I am asking is if I can do it without pulling the motor for no reason hen I will. I will report back on how many if any valve springs are broke.

Anyone wanna take a guess on how many are broken? I'm gonna guess zero. The boat has 400 hrs with 230 of them under 1k rpm.
The winner gets 1 million dollars:eek::grinser010:

Originally Posted by 4bus (Post 3411158)

you can do it without pulling the engine or even the heads, using a leakdown tester to pressurize the cylinder and float the valves.

.

Originally Posted by obnoxus (Post 3411167)

Pressurizing the cyl pushes the valves closed ,,,,not floats them.

Originally Posted by wetwhistle (Post 3410913)

So I cranked the motor over without firing and didn't hear a thing. I tried turning it over by hand and still didn't hear anything rattling. How would the flywheel bolts come out with the coupler over it.

Any Ideas??