Perkins/BUKH info

[DwM]

Hello all

Does anybody have any info on the BUKH transmission that is used with the Perkins 4.108 engines.

I'm working on a 1985 Grand Soleil 39 and it looks like the forward clutches are slipping under load. It shifts perfectly and motor runs great had diver look at prop (Max-Prop) was told it was fine.

Have taken a peek inside and all looks good except the fwd clutch pack seems slightly darker. Only makes 3 or 4 knots forward then engine pulls through unloading reverse works great.

Have looked about the web for a diagram for the trans and all I find are the outside line drawings.

Looking to find out if the clutch packs are serviceable without hauling her out?