1) The rear anchor system of a Mercruiser consists of two parts, The rubber mount and the Bolt Set
2) We sell both the Bolt Set complete and the Set W/ Mount
3) The rubber mounts are pressed into th bell housing (flywheel cover) of the Mercruiser and are the live rubber insulation for vibration in the motor transmitting into the boat.
4) If the rubber fails in the motor mount, the motor will fall onto the mounting tabs which pertrude forward from the inner transom plate on the transom and the entire boat would feel like a vibrateing chair.
5) To change these mounts the bell housing must be removed from the engine and the mounts tapped downward from the top. This is done with a scocket that just fits thru the housing and contacts the allignment removal ring above the mount Both the ring and mount are driven out downward.
6) To replace the mount the ring with the thin side toward the mount is placed into the cleaned out bore. The mount is sanded slightly on the leading corner to eliminate snags. The mount is then placed into a freezer and allower to shrink. the proper tool, usually a scoket which just fits into the bore is pre selected and waiting and at the last minute the bore is preheated slightly with a propane torch to expand the hole. The lubricated , frozen mount is then taped into the hole with the socket and extension. until it bottoms out against the ring. and against the sholder.
8) The bolt comes down hru the mount after the washer and spacer are slid over.
9) Where the bolt comes thru the mount and enters the mounting tab of the inside transom plate, it passes thru a lock washer surrounded by a fiber washer. The Nut goes on the bottom where the bolt exits the mounting tab.
10) When the bolt is tightened the inside tube of the rubber mount is clamped by the spacer above and the lock washer below. This is in a certain height to produce the rear allignment of the engine. if the lockwasher is missing the engine rear is low and causes almost immediate failure of the teeth of the coupler. If the upper spacer is left out the upper washer is jamed against the mount defeating it and causing vibration. If the spacer is missing but the washer is also missing the motor operates normally but there is no upper limit to stop the motor from ripping itself off of the mount. If the fiber washer is missing the motot could make a clunking noise if torqued downward on that side.
11) When installed properly the mount tube is clamped and the motor floats in the extra space between the fiber washer and the metal washer. The shock and vibration absorbed by the live rubber.