Yanmar 6LP DTE...will the fit??

[Capt. Chad]

Hi all, I am kinda new to the forum and my friend finally picked up a 1970 31. We are in the process of hunting down a pair of motors and found a pair of 2000 6LP DTE Yanmars with 1.5:1 Twin Disk 9 degree transmissions. Does anyone here know if they will fit a 1970 31 Bertram? Thanks in advance!!

[Bruce]

Yes they will fit fine.
The DTE's are 250hp. You will need to get different gears if you want to get out of your own way.

1.5:1 is not what you want. You want 2:1 boxes behind those high speed engines.

Do yourself a favor and pay a Yanmar CERTIFIED mechanic or dealer to check them out well.

Twin disc are 10 degree down.
You can use the Hurth/ZF 630A1 gear with an 8 degree down angle.

[Capt. Chad]

Great, thanks for the reply. I will pass the info along.