Join the C34 Association Today!
[C34 Home] [C34Tech Notes] [C34 Tech Wiki] [Join!]
Please login or register.
Advanced search  

News:

Pages: [1]   Go Down

Author Topic: Transmission Fluid  (Read 555 times)

0 Members and 1 Guest are viewing this topic.

Jon W

  • Administrator
  • Forum - Chief Petty Officer
  • ******
  • Karma: 8
  • Posts: 768
    • View Profile
Transmission Fluid
« on: March 27, 2018, 10:17:21 AM »

What automatic transmission fluid do you guys use when you change the transmission fluid? Thanks
« Last Edit: March 27, 2018, 10:25:08 AM by Jon W »
Logged
Jon W.
s/v Della Jean
Hull #493, 1987 MK 1, M25XP, Manson Supreme 35
San Diego, Ca

Stu Jackson

  • C34IA - Secretary
  • Forum - Master Chief Petty Officer of the Navy
  • ********
  • Karma: 68
  • Posts: 7444
    • View Profile
Re: Transmission Fluid
« Reply #1 on: March 27, 2018, 10:25:27 AM »

The latest edition of Dexron.
Logged
Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

"There is no problem so great that it can't be solved."

Jim Hardesty

  • Forum - Master Chief Petty Officer
  • *******
  • Karma: 10
  • Posts: 1038
    • View Profile
Re: Transmission Fluid
« Reply #2 on: March 27, 2018, 12:37:51 PM »

Same as Stu.
Logged
Jim Hardesty
2001 MKII hull #1570 M35BC  "Shamrock"
sailing Lake Erie
from Commodore Perry Yacht Club
Erie, PA

sailaway

  • Forum - Petty Officer 2nd Class
  • ****
  • Karma: 2
  • Posts: 178
    • View Profile
Re: Transmission Fluid
« Reply #3 on: March 27, 2018, 05:53:03 PM »

the most important is changing it. I let mine go for a couple years it changed color to gray. That is not good I used a small pump on my drill motor to suck it out. Had to do it more than once to get it clear. If you can go in reverse not forward your clutch  pads are gone . Charlie
Logged

Bill Shreeves

  • Forum - Petty Officer 2nd Class
  • ****
  • Karma: 0
  • Posts: 186
    • View Profile
Re: Transmission Fluid
« Reply #4 on: March 27, 2018, 06:30:37 PM »

I experienced the extreme result of my PO never changing the gearbox fluid.  Boat was re-powered along with a new gearbox 11 years before I bought.   I thought I was golden.  Learned, after purchase and careful inspection, that the gearbox dip stick was never pulled because the mfg paint wasn't cracked.  Drained a small amount of dark, thick burnt cherry fluid from it and saw the reason for it slipping when shifting to FWD.  Couldn't trust it, installed a new gearbox.  IMO, change your fluid every season and or every 100 hours with the latest Dexron, whichever comes first.   Penny's to save thousands.
« Last Edit: March 27, 2018, 06:44:00 PM by Bill Shreeves »
Logged
The only thing that always works on an old boat is the owner...

Bill Shreeves
s/v "Begnnings" 1987 Shoal Draft #333
M25XPB, Worton Creek, MD

KWKloeber

  • Forum - Master Chief Petty Officer of the Navy
  • ********
  • Karma: 32
  • Posts: 3343
  • "Positive Impact" 1984 C-30 #3573 trbsfk M-25
    • View Profile
Re: Transmission Fluid
« Reply #5 on: March 27, 2018, 11:46:17 PM »

Quote

What automatic transmission fluid do you guys use when you change the transmission fluid? Thanks


The answer is, always use your engine Ops Manual as your first choice for information about most anything. 

The original manual calls for Dextron II, and the newest manual calls for Dextron II or Dextron III.
Dextron VI states that it's backward compatible with Dextron III.

Note that Hurth used Dextron to test the trans, then drained it. 
But then the Ops Manual ambiguously states that either GM (i.e., Dextron ATF) or Ford (i.e., Type F) fluid can be used.  However, the two types should NOT be switched OR mixed if adding fluid. 

One would presume that when commissioned, Dextron (GM) AFT was used, BUT like everything "marine" there's no 100% guarantee, nor any guarantee what a PO may have done (e.g., grabbed a bottle of Ford type F off the shelf at the auto parts store, or worse used the wrong type Ford Mercon fluid.)

Because I was unsure what was in there, I flushed, flushed, flushed, the old out before refilling, and then I knew exactly what I had in there for the future and beyond.

k
« Last Edit: March 28, 2018, 12:03:24 AM by KWKloeber »
Logged
Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

Ron Hill

  • Forum - Master Chief Petty Officer of the Navy
  • ********
  • Karma: 52
  • Posts: 6709
    • View Profile
Re: Transmission Fluid
« Reply #6 on: March 28, 2018, 01:29:18 PM »

Jon : It's said above - Just change the transmission fluid (Dextron oil) every season.
Just like you would with the engine oil - even if you didn't have 100 hrs last season. 

A thought
Logged
Ron, Apache #788

DaveBMusik

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 227
    • View Profile
Re: Transmission Fluid
« Reply #7 on: March 29, 2018, 06:57:04 AM »

Just a quick caution to others, If your boat was repowered, make sure to check the label. I have a Yanmar with a Kansaki transmission which uses straight 30 weight oil.
« Last Edit: March 29, 2018, 06:57:53 AM by DaveBMusik »
Logged
Dave Burgess
Water Music
1986 C34 Hull #206, Fin Keel
Yanmar 3YM30
Noank, CT
Pages: [1]   Go Up