Hello, I am new to the forum and have a question on changing the engine
mounts on my boat.
I just purchased a 1990 44' Tolly Craft with twin 400 6v53 Detroit diesel
motors. The engine
mounts are rusted pretty badly on the outboard
side of both motors, due to pinhole leaks
in the mufflers that sprayed them with a lot of salt water
. I plan to change all the mounts while I am at it. I have owned boats for 25 years, but this is the largest and most complex. I have a lot of mechanical experience from growing up on the farm, and building my own race
cars from the ground up, plus I have always done all my own boat maintenance
, including a complete engine overhaul
on my own.
I can see that I remove the bolts between the engine and the shaft and that is where the alignment must be correct when I am done. I have found instructions on aligning it that say for every inch of plate diameter, you have .001" of alignment tolerance plate to plate. I can't find any instructions on runout when the engine is turned over by hand. Is there any allowed and is the information on the plate to plate tolerance correct?
I am determining the best way to lift
to change the mounts. Are there any suggestions, like do you do both fronts with one lift
, or both sides? Any suggestions on jacking points. I assume that all jacking must be done against the stringers and never the hull
. I plan to rent a hydraulic porta-jack to do the lifting and to move things if needed for the alignment.
Any feedback will be appreciated.