What are the problems with engine shaft alignment?
When it comes to yacht maintenance, one of the least understood and most overlooked systems that require maintenance, engine and shaft alignment probably heads the list. Here’s a short list of the problems associated with incorrect alignment and poor or worn out engine mounts: Rapid bearing wear.
What’s the best way to check a shaft alignment?
Many boat yards think that the way to check shaft alignment is to disconnect the coupling and check the flange clearance with a feeler gauge. That’s only part of the story. Before doing this, with the vessel hauled, check the position of the shafts relative to the bearings.
What should the tolerance be for shaft alignment?
The suggested tolerances shown on the following pages are general values based upon over 20 years of shaft alignment experience at Prueftechnik and should not be exceeded. They should be used only if no other tolerances are prescribed by existing in-house standards or by the machine manufacturer.
What causes misalignment of the stern drive shaft?
Wear or worn out engine mounts cause drive shaft misalignment to stern drive, causing universal joints to oscillate and wear out. These are but a few of the damages that can be caused by basic engine/shaft misalignment.
How does a balance shaft bearing get installed?
Cover the crank shaft key with a cloth to prevent damage to the oil seal when pulling out the front case. Oil is fed to the right balance shaft from the main oil galley. The bearing is installed with the clinch positioned at 12:00 and the oil hole to the right so that it aligns with the main oil galley opening. 4. Balance shaft bearing install
Which is the front end of a balance shaft?
You can use the balance shaft’s front end since it has a larger diameter than the rear bearing. The left balance shaft bearing can be eliminated since the oil is fed through the shaft and not from the block. 5. Stub shaft install Use red Loctite or equivalent! Install the oil pump gears so that the timing mark are shown.
How to remove balance shaft from cylinder block?
Remove all accessories on the front case and remove the front case from the cylinder block. NOTE : If the front case sticks to the block pry over the M10 bolt where the flange is the thickest. Cover the crank shaft key with a cloth to prevent damage to the oil seal when pulling out the front case.
The suggested tolerances shown on the following pages are general values based upon over 20 years of shaft alignment experience at Prueftechnik and should not be exceeded. They should be used only if no other tolerances are prescribed by existing in-house standards or by the machine manufacturer.