[C320-list] Transmission oil change

[Ken Geiger]

I followed this thread with interest and came to the same conclusion that John and others  have;  the trans spec is for SAE 30 oil.  My engine manual and the name plate on the trans both say  SAE 20/30 HD.  The name plate also says Oil QTY 0.6 litres while the manual mentions both 0.3 L and Total effective 0.6 L (rake angle 8 deg)

All this discussion prompted me to change the oil (the level had been checked periodical and was always at correct level) and while I did extract 0.3 litres almost exactly, what I extracted looked like ATF  (Auto Trans Fluid)  Thin and red in colour.  The trans has been working fine as far as I could tell.

So my first stop for advice is here at this group and next will be the local Yanmar Marine dealer.  

With no advice my plan would be to fill it up with SAE 30 run the trans a bit at dock in forward and reverse and then suck that out and refill with SAE 30 and consider the oil changed.  

I believe the engine has about 750 hours on it (according to the hour meter) and I have no idea when the last trans oil change was done but it was before 540 hrs when we got the boat.  

Your advise welcome

regards

Ken Geiger
Northern Dream  2000 #765

 

 

 

---- Original Message ----
From: JJ Morrison <sail-ability at sympatico.ca>
To: Catalina List <c320-list at catalina320.com>
Sent: Fri, Apr 15, 2016 1:54 pm
Subject: Re: [C320-list] Transmission oil change

Those of you changing the tranny oil once a year are engaging in unnecessary time and effort. The engine manual calls for a transmission oil change every 150hr, unless the engine is new then after the first 50hr and every 150hr after that. There is really no advantage to changing lubricants more often than the manufacturer's recommendation; unless of course the lubricant has become contaminated somehow. The recommended lubricant for the transmission is SAE30 engine oil.cheersJohnM1999#574

> Date: Fri, 15 Apr 2016 12:39:20 -0400
> From: martinlrosenberg at gmail.com
> To: C320-List at catalina320.com
> Subject: Re: [C320-list] Transmission oil change
> 
> Over the years, Yanmar has changed the spec for engine lube between 30W and
> 15W40 but has never varied from 30W for the trans. I used to find it easier
> when I only had to store one weight but I personally believe that the 15W40
> is better for the engine.
> Martin Rosenberg
> 
> On Thu, Apr 14, 2016 at 4:36 PM, Daryl Hunt <drhunt at rochester.rr.com> wrote:
> 
> > I'm about to change the transmission gear oil on my Yanmar 3GM30F (Japan)
> > diesel.  I changed the crankcase oil before haulout last fall with Shell
> > Rotella T 15W40.  The Yanmar Operators Manual says to use the same oil for
> > the gear case as the crankcase.  However, my PO left a quart of CD 30 oil
> > labeled "For Transmission" and a Yanmar (Japan) manual "Maintenance of
> > Pleasureboat Diesel Engine - GM Series" aboard specifies CD 10W15 for
> > engine and CD 30 for gear oil.  Since Believe's engine is the Japan
> > version, I'm leaning toward the CD 30 oil.   Make sense?
> > --
> > /fair winds,//
> > //Daryl Hunt//
> > //C320 #660 "Believe"//
> > //Rochester, NY - Lake Ontario /
> >
> >
> > ---
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