The following few replys will show the sequence I used for my Yanmar 3GM30
FW. First, build a jig from plywood
and 1" dowel (assuming that's your shaft size). Mount the engine mounts on the engine, with the adjustment thread in the middle position. Determine the position of the shaft jig (how far from the underside of the engine mount flange to the centerline of the shaft), and drill the holes (1") in the ply, then screw the ply to the base piece. Now, confirm that the shaft is in-line with the engine and precisely below the centerline of the engine. The Installation
diagrams for the engine provide all this info, but it's easy to forget about the thickness of the plywood
Now, you are ready to do a trial fit on the existing engine bed logs
. If the bed logs
need to come in closer, epoxy
and screw (or bolt), some 2 X 4 pieces where they are needed. Fit the jig again to determine if you need to raise or lower the bed logs to match up the shaft with the shaft coupling. You can attach the engine coupling to the dowel to get a very close fit. Be sure that you measure how far aft of the motor
mounts the engine coupling will fit. If you are very brave, drill some starter holes for your engine mount lag screws or bolts. If you are anxious (as I was) skip this step, and do it later with the actual engine, removing the engine to install the mounts afterward.
Bolt the mounts onto the engine. Lower the engine onto the bed logs (this is the trickiest part, trying to work with heavy stuff in close quarters). Use lots of friends, chainhoists, whatever allows you to position carefully the engine onto the bedlogs. Slide the engine back or forth and sideways until the mounts rest securely on the bed logs. Using the engine coupling and shaft coupling, make sure the engine is in-line with the shaft. Mark the holes in the engine mount feet, pull the engine out and secure the mounts to the bed, then return the engine to its rightful position. You are in! And it will take more than a couple hours if this is your first engine, or the position of the engine bed logs is a challenge. Just take your time. I think the accompanying photos are self explanatory. Good Luck!