Hi, when your max prop was dissembled, the yard workers/technicians had no knowledge of a max prop and did not bother to find out. Do not go back.
Meantime, your max prop is set way too coarse. The reason you are not getting expected RPM
is simply because of that. Unfortunately, as you advance the throttle hoping to get more RPM
, because of the coarse setting, your diesel
does not have enough power to turn the prop at normal RPM. As a result, you are unknowingly over-boosting your engine
which results in excessive cylinder head
temperature and possible valve damage. In short, unless you reset the max prop, you will if not destroy your engine
, seriously reduce its life.
Thus at the earliest possibility you need to haul at a competent yard and get the prop reset First you need to identify the correct settings. Check with the factory, they will ask such questions as prop diameter, engine power etc. The handbook has this stuff in it. As an example, my 18 inch thee bladed MaxProp is driven by a 50 HP diesel
through a 2.62 to 1 reduction ratio, Hurst transmission
. Shaft is 30 mm. The settings I use are:
X=K, Y=E (20 degrees). It is a tad coarse and I could operate at 18 degrees. The yacht is a Beneteau
Bottom line: fix it now before something breaks like the engine or tranny!