I had posted similar question regards my 2003 Mercury 115 four stroke. I have seen no response, please help. After having the shaft and powerhead removed in order to repair the oil pan, I now have a motor which destroys impellers about every 30 days. Can a powerhead be installed improperly to somehow apply too much or too little downward pressure on the impeller? The mechanic is telling me the boat should have had a 25" shaft motor not the current 20" and this is the issue. Triton insists the transom is 20", the mechanic insists it is 25", this is a 2003 Triton V186 Bay. The thing is, the boat/motor has worked flawlessly for 12 years, this only happened after having the oil pan repaired which required to removal of the shaft and the powerhead.
