I am curious if anyone has experienced a similar situation.
To start, I bought the boat as a pile of parts. It had a reman engine that had very low hours, but had been disassembled. He did not drain the block, so it cracked. I took the rotating assembly and put it into a new block, machined to match the old block. I assembled it and put it into the boat.
I got a vibration when it ran. I did compression check, and they were perfect. Spark at all cylinders was confirmed. Took the outdrive off to eliminate that as a contributor. Checked runout on the coupler. Swapped the harmonic damper with no change. All fine. Which is what I expected because other than the vibration the thing runs great. Vibration only occurs in the mid rpm range. Not very noticeable at idle or at high speed.
So I pulled the engine back out. Pistons with rods, bearings, caps and nuts had a weights ranging from 1449 grams to 1462 grams. Not great but not as bad I was expecting from the amplitude of the vibration.
This brings me to my question, do I take the assembly in to be rebalanced?
Have any of you bought a pre-balanced rotating assembly and dropped it into your block with success (no noticeable vibration)?
I don't know how the pre-balanced assemblies work with the mercruiser flywheel.
To start, I bought the boat as a pile of parts. It had a reman engine that had very low hours, but had been disassembled. He did not drain the block, so it cracked. I took the rotating assembly and put it into a new block, machined to match the old block. I assembled it and put it into the boat.
I got a vibration when it ran. I did compression check, and they were perfect. Spark at all cylinders was confirmed. Took the outdrive off to eliminate that as a contributor. Checked runout on the coupler. Swapped the harmonic damper with no change. All fine. Which is what I expected because other than the vibration the thing runs great. Vibration only occurs in the mid rpm range. Not very noticeable at idle or at high speed.
So I pulled the engine back out. Pistons with rods, bearings, caps and nuts had a weights ranging from 1449 grams to 1462 grams. Not great but not as bad I was expecting from the amplitude of the vibration.
This brings me to my question, do I take the assembly in to be rebalanced?
Have any of you bought a pre-balanced rotating assembly and dropped it into your block with success (no noticeable vibration)?
I don't know how the pre-balanced assemblies work with the mercruiser flywheel.
