Alpha knocking noise video.

[1985 Century Mustang]

I just found this video on YouTube with the same knocking sound as mine, and it's almost identical. The poster said it was his coupler. Needless I'm going to remove the engine and inspect the flywheel also.

 

[Dubed]

I just found this video on YouTube with the same knocking sound as mine, and it's almost identical. The poster said it was his coupler. Needless I'm going to remove the engine and inspect the flywheel also.

Either your coupler or your flywheel is so loose that its ready to fall off, or its internal. You will know soon enough when you pull the motor. Not much left to talk about till you pull it out and inspect

 

[1985 Century Mustang]

Either your coupler or your flywheel is so loose that its ready to fall off, or its internal. You will know soon enough when you pull the motor. Not much left to talk about till you pull it out and inspect

Yes no doubt. I'll know soon enough when she's pulled. I hope it's just some loose bolts that loctite can't fix perhaps. Anyways it will be done correct whatever is necessary.

 

[1985 Century Mustang]

Today I just ran it in a little higher than normal throttle, and the sound is gone.

 

[1985 Century Mustang]

Did a compression test today:
Cylinder 4 - 150
Cylinder 3 - 150
Cylinder 2 - 165
Cylinder 1 - 145
Pretty darn good for a 1985 Mercruiser 140.

 

[1985 Century Mustang]

Tomorrow the engine is coming out. Hopefully it's just some loose flywheel bolts.

 

[1985 Century Mustang]

The Engine was removed, and as I suspected some coupler bolts were loose or not tightened enough on the flywheel. Further, The 2 rear motor mount bolts were rusted solid. We tried effortlessly to remove them, but to no avail. So we had to seperate the engine from the rear flywheel housing to get the engine free. The inspection plate was removed.

Now the fun starts. I may use MAP propane to heat up the frozen bolts. Unless anyone here has some better ideas. The rear motor mount bolts were rusted in their metal bushing casing and into the housing. They are threaded and can't be punched out.

We had tried many ways to get them out for almost 4 hours or so. With a hoist, PB rust spray, impact drill, hammer etc. They wouldn't budge, we even cut the heads off the bolts, and still wouldn't come out of there rusted grave.

The last photo is just a picture of the flywheel housing that's still on the boat after we removed the engine. The second photo just shows the rear motor mount bolt that are rusted shut, that we may burn out with MAP gas hopefully.

 

[1985 Century Mustang]

I'm going to replace the coupler and purchase a new starter, the old starter worked effortlessly but I need to be pro active as this is a boat and the starter looks pretty dam old and has seen it's better days.

 

[1985 Century Mustang]

I removed the coupler today, the coupler nuts were loose.

 

[Mike Lukacevic]

The Engine was removed, and as I suspected some coupler bolts were loose or not tightened enough on the flywheel. Further, The 2 rear motor mount bolts were rusted solid. We tried effortlessly to remove them, but to no avail. So we had to seperate the engine from the rear flywheel housing to get the engine free. The inspection plate was removed.

Now the fun starts. I may use MAP propane to heat up the frozen bolts. Unless anyone here has some better ideas. The rear motor mount bolts were rusted in their metal bushing casing and into the housing. They are threaded and can't be punched out.

We had tried many ways to get them out for almost 4 hours or so. With a hoist, PB rust spray, impact drill, hammer etc. They wouldn't budge, we even cut the heads off the bolts, and still wouldn't come out of there rusted grave.

The last photo is just a picture of the flywheel housing that's still on the boat after we removed the engine. The second photo just shows the rear motor mount bolt that are rusted shut, that we may burn out with MAP gas hopefully.

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Thanks for the updates