loud unidentified noise
Posted: August 24th, 2017, 8:23 am
Hi All,
My 406 with Volvo Penta engines, has suddenly started making terribly loud noises when in gear. It may be in both sides, but is minimal on the port. Increases of course at higher RPMs. The sound has two components: a grinding abrasive sound and a high pitched squeal. Can be heard on the bridge, but in the aft stateroom is incredible. So, took up the floorplate over the rear strut/cutlass bearing and sure enough BAM! mystery solved. Not so fast! Pulled the boat and there is absolutely NO PLAY in that bearing and it looks perfect. Same with the other side. Yard mechanics are totally puzzled.
Any thoughts?
My 406 with Volvo Penta engines, has suddenly started making terribly loud noises when in gear. It may be in both sides, but is minimal on the port. Increases of course at higher RPMs. The sound has two components: a grinding abrasive sound and a high pitched squeal. Can be heard on the bridge, but in the aft stateroom is incredible. So, took up the floorplate over the rear strut/cutlass bearing and sure enough BAM! mystery solved. Not so fast! Pulled the boat and there is absolutely NO PLAY in that bearing and it looks perfect. Same with the other side. Yard mechanics are totally puzzled.
Any thoughts?