What size prop for my boat

[discountdave]

Hello everyone,
I have a 1985 Grady White 22 Seafarer VIN # NTLBP677D585 that some one stole my original prop off of. It has a Mercury V6 with Mercruiser outdrive. Does anyone know what size prop goes on the boat so I can get a new one please.
Thank you very much

 

[DennisG01]

Hello everyone,
I have a 1985 Grady White 22 Seafarer VIN # NTLBP677D585 that some one stole my original prop off of. It has a Mercury V6 with Mercruiser outdrive. Does anyone know what size prop goes on the boat so I can get a new one please.
Thank you very much

Can you better explain your engine? I "think" you're saying you have a sterndrive, right? That would then be a Mercruiser V6 engine with an Alpha outdrive.

Assuming what I wrote is correct...

It might be tough, though. There are different gear ratio outdrives and it could have been changed over the years, as well. A good starting point would be a 17" or 19" prop - try that and fine tune. Could also talk to a place like Prop Gods

 

[discountdave]

Hi, yes it is a stern drive but it says Mercruiser on it, it is an inboard Merc V6
Thank you

 

[DennisG01]

Hi, yes it is a stern drive but it says Mercruiser on it, it is an inboard Merc V6
Thank you

Yes, then it is a Mercruiser not a Mercury. Mercury in the name used with the outboards. The outdrive is likely named what I mentioned, as well (Mercruiser is a given... it's more about which particular model OD you have).

 

[discountdave]

I will find out what outdrive i have tonight, try to get some numbers off it and maybe a picture and let you know in the morning.
Thank you for the help

 

[Ekea]

just call Grady, they will tell you.

 

[DennisG01]

I will find out what outdrive i have tonight, try to get some numbers off it and maybe a picture and let you know in the morning.
Thank you for the help

The other thing to do is to reach out to Grady (the company)...it's "possible" that they have records going back that far. But we'd still be up against the issue of multiple previous owners and the outdrive may have been changed in that timeframe with a different gear ratio.

Were you able to get to the upper 4,000RPM range? This would be WOT and trimmed till speed no longer increases or ventilation or you reach the upper "safe" trim range. That's good info to know, as well.