Originally Posted by kubcat
After 2 months of anticipation, the Ribtec 890SX has finally arrived.
There has been some minor damage from the shipping that needs attending to but in the meantime as it sits in my garage we would like to service the engines and drives.
We have been assured it has been serviced religiously but it was in Papua New Guinea and we doubt anyone really new what they were doing.
Being in Australia, these motors are quite rare and not sure if anyone really knows what they are doing either so we are giving it a shot ourselves.
Besides fluids and filters, is there anything else we should do?
congrats on the new arrival
as has been already said these drives need some tlc to keep them reliable.
are your drives single or trp duoprop drives??
heres some of my knowledge from the last 7 years and 2000 hrs of yamaha diesel usage.
things that will fail sooner or later in no particular order
1 Both oil return pipes , ie the large and small from the turbo.
2 starter relay / glow plug relay hidden beheind the heat exchanger change them before
they let you down or carry spares.
3 make sure and fit a drive shower and use the best gl5 gear oil available , which yamaha say
shouldnt contain boron, I use castrol SAFXO 75w90 , Quicksilver high performance gear oil
is also well regarded
4 make sure you can achieve rated maximum "LADEN " rpms ie 3900rpm with full fuel and
passengers ,this tip is very important
5 I would also recommend you change your coolant regularly using the texaco bright orange stuff.
6 the cambelt change interval is specified as being 3000hrs,however given the potential damage
I change mine at 1000hrs using gates or toyota oem belts.
7 the water pump is made by johnson pump , and uses an impellar p/n 812b which is a fraction of
the cost of what yamaha charge.
8 as someone has already stated , the yamaha original exhaust elbows are cast and fail internaly,
you can check the condition of yours by squeezing the water pipe at 3000 rpms
if the pipe is hard you are in trouble, it should be squeezable with moderate pressure
if you want to pm me, I can forward you with a copy of the workshop manuals on cd for both the engine and the sterndrive,
As previously stated these are reliable units when run properly and not overpropped,
enjoy your new purchase