Help with first time maintenance on a Perkins diesel

[tgr23]

I've just been volunteered at my club to do some maintenance work on our tender engines (Crosby 21, Velvet drive tranny, Perkins (?). Oh boy. It's a Perkins (62?) but beyond that they don't know much. I'm hoping this image link works. I'm looking for an id of the engine model. Also advice on the following:
-How many hours between oil & filter changes?
-How man hours between fuel filter changes?
-Same goes for trans fluid.

We're at about 140 on one boat and 70 on the other. Both will still run till October.

I'm recommending we do a full engine oil, trans oil, and all filters change at the beginning of the year and half way through. Sound good? Overkill?

If I could find a manual for the engines that would be great also. Any other maintenance advice? Specifically for the oil, trans and fuel filters changes.

Thanks so much!

[captstu]

It would be better to change fluids at the end of the season to avoid having the old oil sit over the off-season and settle or erode the engine.

100 hours is a generally accepted number. To frequent can’t hurt.

[DougR]

Looks like a Perkins 4-108 engine. Can't see the transmission....

Google for owners manual.

DougR