Engine Mounts

When crated, the engine sits on its engine mounts. It is necessary to replace the mounts with blocks in order to remove the mounts. This was done by lifting the engine off the pallet with a cable winch. The mounts were then removed and 4x4 wood blocks were slid in place and secured with lag bolts. The engine mounts on the Yanmar are 19 inches wide whereas the W60 mounts were 20.5 inches. This means that the engine bed must be made narrower. The engine brackets are mounted at the crankshaft centerline whereas the W60 brackets were higher. The Yanmar engine mounts are also much taller than the W60 mounts. In all, the engine bed is about 3 ½ inch too high at the forward end and 2 inches too high at the aft end. The universal joint on the drive shaft allows a little slop in the engine position. If I were attaching directly to the propeller shaft, close tolerances would be needed. In this case, I'd have to use a precision mock-up made from something more robust than the wooden one I made. I should mention that the engine, V-drive, and shaft are not positioned on the centerline of the boat. The entire arrangement is angled slightly to starboard to counter the tendency of the boat to turn to port under power. I attached the four engine mounts to the mock-up and put it into position on the old engine bed. I measured the distance from the bottom of the disk brake to the engine bed and found that it was about four inches too high. This was an inch more than I expected. I later found that the engine mounts compress somewhat under the weight of the engine. It is easier to shim the mounts up slightly after the engine is in position as compared with the prospect of lowering the pan after the fact. If you must err, mount the engine too low. The new engine is lower and shorter than the W60. To insure that water doesn't back into the exhaust manifold, I ordered the optional high-rise exhaust elbow. This protrudes from the side of the engine above the bell housing. I found that the injection elbow would hit the engine cover unless the engine is mounted aft about two additional inches on the engine bed. The engine accessory mount extends the length of the engine by about a foot. Because the exhaust riser is behind the engine, there is not much room to reposition the engine. I found that I had just enough room to accommodate the riser.