Velvet Drive...Not so Velvety... |
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MI-nick
Gold Member Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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Posted: January-12-2009 at 3:59pm |
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Hello All. Finally I have taken the time to register on this fantastic site. I have been reading the posts for years and have learned alot...even bought a boat listed on the site.
I currently own 2 Correct Crafts. a '93 Ski Nautique and an '88 2001. The question I have today is one I could not find any information on using the search function. The question relates to the Velvet drive in the '88 2001 (~650 hours on the boat). When shifting from neutral to forward, forward does not engage until the past the detent. When shifting from neutral to reverse, reverse engages before the detent. I tried disconnecting the shifter cable and shifting directly at the transmission and got the same result. It seems as if the points where foreward and reverse do engage are offset about 10 degrees foreward from where they should engage?? does that make sense?? I noticed this problem near the end of last season and didn't think much of it as the only issue is sometimes a hard shift (clunk) into reverse if I don't move the lever very delicately. Anyway, I'm posting this now because I had nothing better to think about on my long drive last weekend and I really want to know what's wrong and fix it. Does anyone know what could be the problem?? thanks for your help. here are the prerequisite photos of boat, girl, and girl & boat. |
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As far as I can tell, I'm not quite sure...
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nates78ski
Platinum Member Joined: January-24-2005 Location: United States Status: Offline Points: 1041 |
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Welcome! & yeah... you must have been lurking for a while... 1st post & you already know to post pictures of your boats & girls.
Only problem is that they aren't showing up... Nate |
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86BFN
Gold Member Joined: July-28-2008 Location: Indiana Status: Offline Points: 882 |
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Welcome to the site Nick. Eric should chime in soon to give you a tranny assessment. In the mean time, see if you can get those pictures up.
cause ya know we love pictures! there's a couple of other fellow on here up in your neck of the woods too. |
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MI-nick
Gold Member Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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i think the photos are up now...can you guys see them??
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As far as I can tell, I'm not quite sure...
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Keith
Admin Group Owner / Operator of CorrectCraftFan.com Joined: October-20-2003 Location: Pepperell, MA Status: Offline Points: 1917 |
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Welcome MI-nick! I just fixed your photos. FYI - The system doesn't like brackets '(' or ')' in file names. It takes them out in the link. I simply renamed your files on the server.
You're all set. I encourage you to also add yourself to the Diaries -Keith |
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75 Tique
Grand Poobah Joined: August-12-2004 Location: Seven Lakes, NC Status: Offline Points: 6130 |
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You're catching on fast. Welcome.
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_____________
“So, how was your weekend?” “Well, let me see…sun burn, stiff neck, screwed up back, assorted aches and pains….yup, my weekend was great, thanks for asking.” |
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MI-nick
Gold Member Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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thanks keith. you probably don't remember, but last spring i emailed you regarding the '88 2001 shown above. the boat was listed here and i was having trouble contacting the seller by email. i emailed you and you gave me the guys phone number. anyway, i ended up buying the boat so thanks alot!!
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As far as I can tell, I'm not quite sure...
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nates78ski
Platinum Member Joined: January-24-2005 Location: United States Status: Offline Points: 1041 |
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Nick, Well done on all counts!
Nate |
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Terp
Senior Member Joined: November-12-2008 Location: Deep Creek Lake Status: Offline Points: 339 |
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What?! No comments from J "Hugh Hefner" Bear yet? Must be slowing down in his old age.
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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the valve is pretty much a static valve, when its detented the valve is in the correct position and the internal ports are lined up. if your question is, can the problem be related to the valve? no,
the boat is an 88 which means the trans is 21 years old and after time the seals harden up and wont seal internally and need more oil to push the piston....Dont use additives it only creates more problems. the most accurate way to troubleshoot the transmission is with a pressure guage installed and pressure charts. when you go from neutral to forward or to reverse the guage should snap up to pressure. if it moves slowly then there is internal leakage. and the pressure needs to be within spec. there really is nothing you can do to the trans short of rebuilding it. dont assume clutch plates go bad either....they need a reason to go bad post more syptoms, does it drag in neutral? how does the oil look? how is the alignment? does the oil have a burnt smell to it? list anything out of the ordinary that you may have noticed recently in the transmissions performance |
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"the things you own will start to own you"
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86BFN
Gold Member Joined: July-28-2008 Location: Indiana Status: Offline Points: 882 |
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I was thinking that! |
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storm34
Grand Poobah Joined: November-03-2008 Location: Dexter Iowa Status: Offline Points: 4492 |
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Nick,
Love the pics of the 88! My family has owned one for a little over 10 years and we couldn't have asked for a better boat! I had a problem with our trans acting in a similar manner. We found that the problem was actually due to the idle being set too high. When you would engage the throttle it would act more like our pontoon, almost winding up and then slamming into gear. (sounds similar to the extra ten degree play you have in the throttle if I read your post correctly) I don't know if that helps but I thought I would throw out some of the little experience I have since i'm a young buck! I'll be very interested to see what the outcome is! Good Luck! ps- my girl would kill me if I put pics of her up! |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Way too early in the day for him,I think he's part owl |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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.....snoop bear will be along shortly
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"the things you own will start to own you"
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86BFN
Gold Member Joined: July-28-2008 Location: Indiana Status: Offline Points: 882 |
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I was going to suggest that maybe he's not up from his nap yet,
but I didn't want him to think I was insinuating that he's getting old. |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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you guy's keep in mind that i dont have a crystal ball and can tell exactly whats wrong with these transmissions, I always assume that you go through all the checks of making sure there is oil in it, the linkage is adjusted properly, the RPM's are correct. Ive learned over the years that sometimes I dont get all the info needed. from what it sounds like on this one is the seals are hard or maybe to much clearance in the pump and the trans is delaying because oil volume is down or the oil is going past the seals. what i told you to look for should help determine what the problem may be
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"the things you own will start to own you"
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Luchog
Grand Poobah Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135 |
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Eric, may be you should change your signature to:
First Check oil level, check throttle linkage, check iddle RPM's...now how can I help you???" |
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MI-nick
Gold Member Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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thanks for all the replies.
some more information. 1) I have a slight drag in neutral shifting from foreward to neutral. it will usually stop witin a few seconds. I can easily stop it by hand. It will also stop if I shift into reverse and then back to neutral. 2) idle is 600-700 RPM. 3) Oil level is full and has no burnt smell. I have not used any additives. 4) Alignment needs to be verified. PO said OK in April '08...shame on me for not confirming. 5) I replaced the O-ring seal on the shift valve last summer (leaking). I assume I reconnected the linkage correctly...but, the shifting issue was the same before and after the change...and with the linkage disconnected. 6) When shifting into forward I move the lever to the forward detent, wait a few seconds, and then forward engages gently. 7) When shifting into reverse I move the lever very slowly towards the reverse detent and reverse will usually engage gently before I get to the detent. If I move the lever too fast, sometimes it is a hard shift (clunk) into reverse. Once in gear everthing runs smoothly. I understand the trans is 21 years old and these things do wear out. If it needs to be rebuilt, so be it...but of course I would rather save that money for gas. thanks again for all your help. |
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As far as I can tell, I'm not quite sure...
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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the clunk may be damper related which is also a wearable item, you should have nice positive engagements with a properly working tran.
a good way to understand these transmissions is: you have a pool with a cover on it, at the bottem of the pool is a 5" hole and it is leaking. at the top is a 10" water pipe to fill it, obviously the 10" water fill will overcome the 5" hole and fill the pool rapidly and start to put pressure on the cover (that acts as a piston) now if you have any problems with the 10" fill pipe such as the pump is worn, it is leaking at the connection...you get the point... the pool will not fill as fast or the pool will not build pressure and push the cover up. its the same theory as a transmission, and thats how you think about it to troubleshoot the trans. if you were looking for a quick fix I dont think you will find one. the thoughts are out there that if the pump is bad you can slap one on and be down the road, well true to a point, but what about the metal thats missing in the pump? it also stays in the trans |
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"the things you own will start to own you"
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MI-nick
Gold Member Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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man, you're quick.
i understand the pool cover analogy. but, that doesn't seem to explain reverse engaging "early". I'm definitely not looking for a quick fix just a better understanding of the issue and the trans inself. thanks alot!! |
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As far as I can tell, I'm not quite sure...
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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the revesre circuit is straight forward, no bushings to go through nothing spinning, oil goes from the valve straight to the front cover where the piston is and is pretty fail safe. the cavity is always full of oil and it does not take much to apply the reverse piston unlike the forward piston. it will go into gear early if you shift the lever slowly because the ports are starting to line up, they are designed to be shifted quickly not slowly as you are doing, you are "feathering it like a clutch pedal" and its not designed to do so. when you detent that lever it will go into gear positively or something is wrong
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"the things you own will start to own you"
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MI-nick
Gold Member Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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ok, this is starting to make a little sense.
if i shift normally into reverse, i get the hard shift/clunk which could be a bad damper. shifting into forward is delayed potentially because of bad pump/hard seals. i don't have the hard shift/clunk into forward because the shift is delayed. does that sound like it could be correct?? is there anyway to test for this or is rebuild and new damper the only way to go. honestly, if it's questionable, i would rather just go for the rebuild and new damper rather than risk days/weeks in the summer with no boat at home. can you give me a ballpark on the cost for this?? |
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As far as I can tell, I'm not quite sure...
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13514 |
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Nice glass and ass you got there.
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MI-nick
Gold Member Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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what else do you need...wait...i know the answer...
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As far as I can tell, I'm not quite sure...
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jbear
Grand Poobah Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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Uhhh....I just woke up...holy crap.
Actually 86BFN felt either bad for me or thought maybe I was just outa it...anyhow he took mercy on me and sent me a personal e-mail to wake me up. Sure are glad to have ya here Mi. I kinda like how the new guys are figuring out this site. Purple just might be my new favorite color...never liked it on a boat before but I see it in a whole new light john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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adamt
Gold Member Joined: July-18-2007 Location: Orlando, FL Status: Offline Points: 927 |
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That picture was a little difficult to see, as a courtesy to Jbear, I brightened it up a bit. |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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I thought i was the pro at changing topics, does photo shop remove?
anyways another transmission lesson....please dispute.....OIL PUMPS DO NOT CREATE PRESSURE and keeping that in mind you can further troubleshoot a trans. explanation will follow |
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"the things you own will start to own you"
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81nautique
Grand Poobah Joined: September-03-2005 Location: Big Rock, Il Status: Offline Points: 5779 |
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I'm gonna go way out on a limb here but is your engine revving slightly before the trans goes into reverse causing the clunk? Going into forward late and reverse early me thinks the linkage needs adjusting. Not to dispute the Guru's findings but could it be that simple?
ps. I agreee with HW, welcome |
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You can’t change the wind but you can adjust your sails
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79nautique
Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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might be a compination of both, dampner and cable adjustment. If as Allen stated the revs are going up slightly before it engages reverse that would be a cable issue. If when you removed the cable from the lever arm and moved it manually and it didn't change RPM but clunked then that would most likely be a dampner plate issue, now if it shifted fine then you have a cable adjustment issue.
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quinner
Grand Poobah Joined: October-12-2005 Location: Unknown Status: Offline Points: 5828 |
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First off I was thinking along the same lines as HW, then I decided to read the post, regarding the shift problem, I was thinking the same thing as Alan, had a similar issue with my 99' from new and it was a linkage adjustment, the throttle was moving prior to the boat going into forward gear.
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