My neighbor purchased this boat recently and I noticed some rocker arms sound loose. Tapping sound gets faster as the engine revs up. I already asked him to order the manual but can anyone tell me if the rockers on this engine are adjustable ? Reading thru the posts it sounds like some models the arms get torqued down, while others have an adjustment procedure. We should have the manual in a few days but being a new boat to my neighbor we would like to check out the rockers tonight if someone has the procedure.