Baller_ swbca Posted June 24, 2021 Baller_ Share Posted June 24, 2021 This 2004 ProStar is fairly new to me. In reverse at minimum throttle there is often a rattle from freeplay in the transmission or drive train. Its a sound I remember from my 1986 ProStar which I bought new but never worried about it. Is this freeplay rattle normal. Both boats had a 1:1.5 geared unit. I'm asking because when I drove a 2008 Ski Nautique 196 2 days ago the transmission was super smooth and quiet. Could barely feel or hear anything putting it in gear and there was no rattle. Link to comment Share on other sites More sharing options...
Baller LeonL Posted June 24, 2021 Baller Share Posted June 24, 2021 Check to see if your prop is tight. Link to comment Share on other sites More sharing options...
Baller Andre Posted June 24, 2021 Baller Share Posted June 24, 2021 Same noise on my partner 06 197. No transmission problems on his boat. My ski finish in 16.95 but my ass is out of tolerance! Link to comment Share on other sites More sharing options...
Baller scoke Posted June 24, 2021 Baller Share Posted June 24, 2021 In a Mastercraft, that’s a known feature. In a Nautique, that’s a bug. Hahaha Link to comment Share on other sites More sharing options...
Baller ETskier Posted June 24, 2021 Baller Share Posted June 24, 2021 Those 1.5 :1s have always sounded like there's marbles in them in reverse. Link to comment Share on other sites More sharing options...
Baller ScottScott Posted June 24, 2021 Baller Share Posted June 24, 2021 I'm with @LeonL Link to comment Share on other sites More sharing options...
Baller Broussard Posted June 24, 2021 Baller Share Posted June 24, 2021 In my experience the prop being loose typically does not cause a rattle. More of a "thunk" when going from forward to reverse as the direction of rotation is causing the prop to move fore and aft on the shaft. . Link to comment Share on other sites More sharing options...
Baller_ swbca Posted June 24, 2021 Author Baller_ Share Posted June 24, 2021 I guess the Rattle is standard on the ZF 63A transmission. Somewhere in the past ZF started specifying 15W40 motor oil to suppress the rattle and 15W40 is specified in the 2004 Master Craft owners manual. That's been used in this boat from the beginning and I changed the oil last fall with 15W40. But it still rattles just like my last 1:1.5 ProStar transmission. Maybe I'll put chain saw bar oil in it . . that stuff is really viscous and sticky :smile: Link to comment Share on other sites More sharing options...
Baller Jordan Posted June 24, 2021 Baller Share Posted June 24, 2021 Could be the damper plate. Link to comment Share on other sites More sharing options...
Baller LeonL Posted June 24, 2021 Baller Share Posted June 24, 2021 @Broussard you are right, but "rattle" can be quite ambiguous. @swbca I believe that I'd pass on chain bar oil. I suppose that 20w50 might be an acceptable substitute. Link to comment Share on other sites More sharing options...
Baller_ swbca Posted June 24, 2021 Author Baller_ Share Posted June 24, 2021 @LeonL I wasn't serious about Chain Saw Bar Oil. Do you remember the STP Oil Additive to stop cars from burning oil ? It took a few minutes to pour a 10 oz can of that stuff into your engine. Nothing would rattle with straight STP . . not going to try that either. I don't care that much about the rattle as long its not a warning that something is getting ready to fall apart. My 86 ProStar Power Slot had the same rattle at 50 hours and probably when new. Link to comment Share on other sites More sharing options...
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