This Boat Motor Has Zero Compression

This Boat Motor Has Zero Compression | Here's Why

Рет қаралды 5,500

4 ай бұрын

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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Пікірлер: 38

@hunterb1215

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 .

@ericvogel1126

Looks like it got badly overheated.

@jamuherbal

Hello friend good morning ❤❤❤👍👍👍👍🌹🌹🌹🌹👋👋👋👋

@WesLovelace

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!!😎

@sammyrothrock6981 14 сағат бұрын

All these engines need metal replaceable sleeves

@garyradtke3252

Even the one you called good is scored!

@lewisbolman7862

Stuck rings may get loose with power tune, follow instructions, some times I let it soak over night.

@sammyrothrock6981 14 сағат бұрын

Piston scuff scoring is common on 2 strokes

@JonGunnerOutdoors

It is fun tearing into a engine and diagnosing the issues.

@nnglenn

Looks like you overheated it!

@dougtaylor7724

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.

@markglabinski526

This was really interesting. Thanks!

@JohnAmes

Some great information my friend

@corey2one

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.