I was testing my new props today. About an 1hr into driving, i heard a pop, almost like a back fire. I stopped, checked the engine and everything seemed fine. I couldnt get the engines to wind up all the way. Got back and one of my props was loose. pulled it off and it grinded into the lower case, and no thrust washer. are they know for breaking??

in 25 yrs never seen one break have seen them wear when a prop spins a hub, did someone just put prop on?????

are you sure its not stuck in the back of the prop?????


weird

i put the props on this morning, and the thrust washer was there. i got back, and it wasnt

yes, it also wore into my lower with its absence.

ill take some pics tomorrow.

Ive never seen one just disappear, When I install props I use an batt impact with 180 ftpd and tourque them much more the the specs call for never never had one break what drives are you running ???????

I had this happen before too, well sort of.

Changed props, thrust washer stuck in old prop and I didn't notice, installed new prop during a brain fart

Im sure it wasnt in the old prop. Im starting to doubt myself if it was in there. Now im 90% sure (I was 100% ) . It was running good, 5400 rpms, heard a pop, like a backfire. I stopped and checked the engines, everything was good. Started back up, but only to get 5000 rpms. checked it when i pulled the boat out, and found this.

1st one is good side, second bad side

1) if it was in there and broke or shattered the zinc would be scared up and it looks fine to me

2) if it did break it would have broken in to REALLY small pieces to disapear through the prop hub

Any thoughts on the loud, single pop like a backfire, then loosing 400rpms? I really dont think it came from the engines.

You would think rubbing against the outdrive would slow it down quite a bit.