Yanmar 2QM15 - Reversing Gear Fluid

Jason K · Post by **Jason K** » Sun Aug 05, 2007 10:31 pm

I am just about set to tune the engine up. The only stumbling block is I can't find the proper fluid for the reversing gear.

The (25 year old) manual calls for ATF-A type fluid. I can't find that anywhere, even online. Is that an older type that may be rebranded? Or does anyone know if there is a current ATF fluid that is compatible with ATF-A?

I asked the local Yanmar service center and they said to use SAE30. That erodes my confidence in them as the manual clearly calls for ATF.

Any ideas? Tim (Allen) - have you changed the reversing gear fluid in your 2QM15?

Thanks!

Figment · Post by **Figment** » Sun Aug 05, 2007 10:42 pm

As far as I know, oil grades supersede each other. It's a generational thing, and each generation can substitute for those that came before.
That is to say that grade B will also work in machines that need grade A. Grade C will work in grade B and grade A machines, etc.

I guess I'm saying that any old ATF oughta work.

Jason K · Post by **Jason K** » Tue Aug 07, 2007 12:15 pm

I've done a bit of research and I'll answer my own question. Mike, you're a little bit off - some ATF's are backwards compatible while others aren't.

ATF-A has given way to Dextron II and Dextron III.

Here's what Nigel Calder has to say in Marine Diesel Engines:

Nigel Calder wrote:Most transmissions operate on 30-weight engine oil or automatic transmission fluid (ATF type A - normally Dextron II or Dextron III; the latter is an improved formulation of the former and is interchangeable with it). Note that mixing some different types of transmission fluids (e.g., A and F types) can destroy transmission seals, so be sure to stick with whatever the manufacturer specifies.

Figment · Post by **Figment** » Tue Aug 07, 2007 12:45 pm

hmmmm, I wonder if this is why we blew the tranny in that plow truck for 8 consecutive winters....

Post by **Tim** » Tue Aug 07, 2007 12:57 pm

Figment wrote:hmmmm, I wonder if this is why we blew the tranny in that plow truck for 8 consecutive winters....

It is said that the definition of insanity is repeating the same process over and over while expecting different results. hehe

Figment · Post by **Figment** » Tue Aug 07, 2007 1:14 pm

yep. We recited that very line to the transmission shop that continued to give a one-year warranty with each rebuild. Only ONCE did it go beyond 12 months.

catamount · Post by **catamount** » Mon Aug 13, 2007 3:36 pm

#218 wrote:Tim (Allen) - have you changed the reversing gear fluid in your 2QM15?

Not yet -- but thanks for doing the research for me! ;-)

Jason K · Post by **Jason K** » Mon Aug 13, 2007 3:45 pm

No problem!

Also, I've got the operation and service manuals here if you need them:

Operation:
http://www.rambunctiousracing.com/files/2qm15.pdf

Service:
http://www.rambunctiousracing.com/files ... ervice.pdf

catamount · Post by **catamount** » Mon Aug 13, 2007 4:08 pm

Thanks, I've got them. What you really need though is the Parts Manual - do you have one of those? (I think I've got two...).

Jason K · Post by **Jason K** » Mon Aug 13, 2007 4:17 pm

No, I don't have the parts manual. In fact, it didn't occur to me that I need it. All of sudden, I think I can't do without it. :)

I would be happy to liberate one of yours, if you have a spare.

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Yanmar 2QM15 - Reversing Gear Fluid

Yanmar 2QM15 - Reversing Gear Fluid

Re: Yanmar 2QM15 - Reversing Gear Fluid