This Boat Motor Has Zero Compression | Here's Why

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I have a Mercury 135hp motor that didn't start. After a few tests, I discovered the three starboard cylinders had zero compression, while the three port side cylinders had normal compression. I did a tear down of the motor and discovered the cause.

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Make sure your water pump is working properly . Could also be an air leak, creating a lean condition. Make sure you find out why all three pistons failed before you put the engine back together, or it will happen again. Hopefully, this helps .

hunterb

That thing has run marginally hot for a while. The pistons get hot at the exhaust side and it pushes it over to the transfer port side and makes the lands start dragging and sticks the rings. Your seal ring on crank has always been broken more than likely. Check to see if the block has a groove. If not, they broke the ring when motor was assembled At Mercury. I’ve seen about 20 or so of those.
Put a water pump kit in it, make sure the poppet plastic seat is still in place. Sometimes they move and the water doesn’t flow. But you have massive water pressure. That will make one get hot and pop.
Replace your check valve that lubes the top bearing. Probably has one on bottom main and one on top.
Check your reeds. That will get water in cylinder.
Replace the two thermostats also.
Did you have any loose bolts when you took it apart?

dougtaylor

I thought you said you are not a boat mechanic, but you are doing great job, as always awesome video my Man!

f.acatfish

This is a very interesting video thanks for sharing your experience with us.

robertdoyen

Ouch! That’s not good! Looking forward to you getting it purring 👍

HuntingFarmerOfficial

I wish I could add a picture. I have a 1996 150 that looks identical to yours. I was out the river recently and suddenly lost power. Mechanics are all booked. Decided to start looking at the obvious. Opened up the cyclinder head and good lord. I can’t afford to replace the motor so I too am about to order a rebuild kit. But I also don’t know the full cause. I do know I contributed by putting in premium. Apparently that’s a no-no with these motors. One of the piston rings was broken to pieces, all gray/burnt. Without a mechanic, idk if there’s an oil issue, cooling issue, or if higher octane is capable of such damage.
So far I seem to be the only girl trying to figure this out on here…I don’t think the odds are in my favor 😂 But either way, I have no boat so what the hell. Might as well try.
I hope to see more videos of where you’re at with yours, thanks for the great footage.

coreyone

The crank and the rollers looked like they were affected by corrosion ...You sure there isn't a crack on the starboard side....The blow by was obviously caused by the sticking rings!!😎

WesLovelace