tranny fluid change
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=10358
Printed Date: November-16-2024 at 8:17pm
Topic: tranny fluid change
Posted By: 82ski2001
Subject: tranny fluid change
Date Posted: May-02-2008 at 12:51am
| hey guys, this is my first tranny fluid change, what do u guys use fluidwise? and what is the easiest way to drain and dispose of cleanly? thanks for all the help as usual |
Replies:
Posted By: eric lavine
Date Posted: May-02-2008 at 12:54am
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Dexron/Mercon only, no transmission tune-ups in a bottle, no synthetics,
use the search for pumping transmission oil ------------- "the things you own will start to own you" |
Posted By: 82ski2001
Date Posted: May-02-2008 at 12:55am
| i hear ur the man, thanks eric |
Posted By: 82ski2001
Date Posted: May-02-2008 at 1:02am
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one more thing, alotta other forums are saying that the older boats used 20w oil. why is that? and it said one place the 20w makes is quieter and smoother. do i need take the lines off to get the old oil out, or will that liitle bit not hurt anything. sorry for all the questions
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Posted By: behindpropeller
Date Posted: May-05-2008 at 1:57pm
Listen to Eric, he makes his living fixing these and offers the best advice. ------------- |
82ski2001 wrote:Posted By: eric lavine
Date Posted: May-05-2008 at 3:39pm
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he may have an earlier PCM, in order to swap over to Dexron Merc, you need to completely clean the 20 w out of the trans
What trans do you have? I assumed it was a Borg, the later PCMs swuitched to Dex/Merc. one i rebuild an older pcm i switch over to dexmerc. if so, you may have to stay with the 20, ------------- "the things you own will start to own you" |
Posted By: weitekampt
Date Posted: May-08-2008 at 2:49am
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Do you mean dextronIII/Mercron? I know my ford transmission in my truck calls for Mercron ONLY, but it is Dextron III/Mercron. I had the person that rebuilt my trans say any old trans fluid is fine. I change it every year.
Let me know about the Dextron III/Mercron rating. ------------- 1993 SkiNautique ProTec 2009 Boatmate trailer. 1240 hours on meter. http://www.correctcraftfan.com/diaries/details.asp?ID=1559&sort=&pagenum=2&yrstart=1991&yrend=1995 - 1993 Ski Nautique |
Posted By: eric lavine
Date Posted: May-08-2008 at 10:20am
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DexronIII/Mercon yes ------------- "the things you own will start to own you" |
Posted By: weitekampt
Date Posted: May-08-2008 at 5:11pm
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Thanks Eric. I think I have some in the garage. ------------- 1993 SkiNautique ProTec 2009 Boatmate trailer. 1240 hours on meter. http://www.correctcraftfan.com/diaries/details.asp?ID=1559&sort=&pagenum=2&yrstart=1991&yrend=1995 - 1993 Ski Nautique |
Posted By: dans
Date Posted: May-11-2008 at 3:47am
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Eric, Castrol Syntec has been used in our 82 2001 for about 3 seasons. Should I switch back to regular tranny oil ? We have never had a re build or any tranny problems so far. Thanks, Dan ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1404&sort=&pagenum=1&yrstart=1981&yrend=198582 - 82 2001 |
Posted By: eric lavine
Date Posted: May-11-2008 at 12:44pm
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Dans, you decide, every trans school i went to, Twin Disc, Funk, Clark that was always one of the top questions....and the answer always was none of these transmissions are designed to use synthetic oil because it robs the co-efficiency of friction which makes the plates break free easier than they do with normal oils
that basically was the only reason, In a transmission you do not have cast iron running against similar metals like piston rings in an engine, there is no real contact of anything inside the trans besides the clutch plates, (ball bearings roll) and in a transmission you are relying on the friction to hold the plates together. Chances are you probably will never see a problem running the synthectics in these transmissions because of the prop size (small) these transmissions are also used in larger boats spinning twice the prop and these are where the synthetics would probably be noticed. Is there any advantages to running synthetics in a transmission?? I cant think of one ------------- "the things you own will start to own you" |
Posted By: SNobsessed
Date Posted: May-11-2008 at 12:49pm
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The advantage would be to the store selling expensive oil. ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: eric lavine
Date Posted: May-11-2008 at 12:58pm
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here is a good way to understand transmissions: if you put your hands together as if you were praying, your left arm is the engine and your right arm is the prop shaft and your hands sandwiched together is the transmission, if you put molasses between your hands and try to spin them you will have a tough time, now if you use hand creme between the two it is easier to spin them free of eachother, this is a good example of using synthetics (hand creme) when building higher horsepower trannys you always take this into account and a couple things you do is: increase hand size (piston) add more hands (cluthes) push hands together harder (more pressure) dont use hand creme (oil)
hopefully this will answer your question and it makes it easier to understand how the trans operates BTW, your hands sndwiched together is considered the co-efficiency of friction ------------- "the things you own will start to own you" |
Posted By: dans
Date Posted: May-11-2008 at 4:36pm
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Eric , So if you were me would you switch out to the regular ? If so should I just change it the next three times I go out & be done with the switch. I guess I could go to a regular castrol dexron/mercon. There is no dangers going back to regular oil after synthetic is there ? Thanks Eric. Dan ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1404&sort=&pagenum=1&yrstart=1981&yrend=198582 - 82 2001 |
Posted By: eric lavine
Date Posted: May-11-2008 at 5:00pm
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yeah, i would dilute and then flush with normal Dexron/Mercon and then use it from here on out
no dangers ------------- "the things you own will start to own you" |
Posted By: Luchog
Date Posted: May-11-2008 at 10:41pm
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Eric: I use Alison C4 around here, there's another wich says HIDRO ATF, "Dextron III type oil" or something. What do you think? ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=2095" rel="nofollow - 1980 Ski Nautique Commander 351W |
Posted By: shawnmc
Date Posted: May-14-2008 at 3:13pm
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eric,
I guess i am confused...but what if you have no idea what the PO used before. I am reading that i should just change whatever is in there to DexronIII/Mercon????? |