I am looking into getting a bore scope or endoscope, preferably with a dual camera or mirror attachment. My gut suspects carbon build up on a valve or something else in the cylinder related to compression relief. I do not suspect the cam shaft at present or anything on it. The seemingly useless...
I did again and as far as I can see the valves are opening and closing just fine. The rocker arms move up and down, and the valves do too without any hesitation or noticeable stickiness. I discovered also that I can see most of the push rods too and these appear not to be bent in any way. If...
I also saw that gizmo in the flesh... or in the metal... I have no idea what it does. It does move slightly. I can manipulate it slightly with the end of a pencil. But it appears totally connected to anything mechanically. I suppose I could try to fix it in one extreme position and then the...
I had the very same thought recently as one of the few possibilities left to consider. I certainly saw the rocker arms moving. Perhaps they are sticky and slowly open or close? I will take another look soon.
I had it in neutral. And, as per my original post, I already removed the power head and have it on a bench, ie, the lower unit is not attached to the power head. This is in no way a lower unit issue.
So where is the compression release mechanism on this motor? I don't see it. Not in the service manual, nor on the cam shaft. Where else to look? What do I look for? Does it even have one? How to fix? Etc. Those are my questions.
I understand that but the normal compression appears to have increased dramatically and is sometimes so hard the motor will tip over rather than the flywheel rotate. I think that is proof enough something is wrong.
A week ago I did not notice anything blowing out. Today nothing blows out. And it is easy to pull without the spark plug. It is hard to pull with the spark plug. Lots of resistance during part of the cycle.
Looking at another thread here on iboats (https://forums.iboats.com/threads/3-5-mercury.777945/#post-5966759), and doing research online I have discovered that this motor has a de-compressor? Where? How to fix? Mine is very hard to turn over. I originally thought it was a valve timing issue, but...
