help with diagnosis
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=9760
Printed Date: May-08-2024 at 6:50pm
Topic: help with diagnosis
Posted By: waterlover
Subject: help with diagnosis
Date Posted: March-02-2008 at 4:50pm
|
I have an 89 Barefoot Nautique. Over the past four years, it will occasionally act as if it hit a log with the prop when it is under a lot of power during takeoff. I am concluding it is caused by a momentary slipping of the transmission, followed by a sudden regrabbing. All of the reports of transmission slipping on this forum I have read sound much different--so I am reluctant to pull the transmission without knowing for sure that is the problem--but I can't think of anything else. It would seem to me that a slipping trans would quickly get worse. I would also not think it would suddenly regrab.
Shortly after obtaining the boat, I noticed the trans fluid was mixed with water. I pulled it out and replaced it several times. Can anyone help me diagnose this problem? ------------- waterlover |
Replies:
Posted By: eric lavine
Date Posted: March-02-2008 at 8:39pm
|
PCM or Borg Warner? there 2 different animals and will help in diagnosing the problem, I would think that it has a 10-18-004 since it is a barefoot, currently how is the engagement in seconds, this will usually tell what the condition of the trans is in, it is close to impossible to get the water out of these trannys no matter how many times you flush them and also depends on how long the water sat inside, if you could be very specific about everything that is going on please list, information is key to diagnose if it is a trans problem ------------- "the things you own will start to own you" |
Posted By: waterlover
Date Posted: March-03-2008 at 2:10am
|
It is a Velvet Drive. The transmission engages and disengages properly. The boat works normally except when under a lot of power. The first time it happened, I thought I hit something like perhaps a stump under water. Since it has repeated several times, I know I am not hitting things. I think the transmission may be very briefly disengaging and then abruptly re-engaging after the engine gains some RPMs. ------------- waterlover |
Posted By: eric lavine
Date Posted: March-03-2008 at 9:29am
|
a slip is more of a smooth release and the rpms will rise rapidly, and it only takes a couple times at higher rpms to warp the plates from heat and lock the trans in forward which will make the trans loose nuetral when in nuetral, when the plates warp from heat you loose your forward clutch pack clearance and they will drag. I assume you checked the oil level? and did you smell and look at the color of the oil? these are other indicators of the condition of the trans. check all your keyways on the shaft and at the prop making sure that there is nothing loose and rotating under power.
from what you are describing does it completely come out of gear and does the tach spike to high rpms as it would from the problem your describing? ------------- "the things you own will start to own you" |
Posted By: waterlover
Date Posted: March-04-2008 at 2:47am
|
The tranny oil is red and is not burnt. The keys are in place on both ends of the shaft. I don't know if it completely comes out of gear. It is definitely not a smooth release. This is very fast. It regrabs so hard it sounds like something is going to get torn up. ------------- waterlover |
Posted By: eric lavine
Date Posted: March-04-2008 at 10:23am
|
it possibly sounds like a broke forward belleville spring, its very hard to say. these tranny's either work or they dont, there are no in betweens, are you going to further test? do you have access to a pressure guage? from what your describing it does sound like something is broken (not worn) there is a difference. i have no problem if you want to call me, It is alot easier to talk a tranny problem, i talk to ten guys a day with tranny problems...its alot easier to figure out sometimes ------------- "the things you own will start to own you" |
Posted By: 64 Skier
Date Posted: March-05-2008 at 5:42pm
|
Are you checking the fluid level after warm-up? ------------- 64 Skier 66" HO VTX and 67" HO Triumph http://www.correctcraftfan.com/diaries/details.asp?ID=1071&sort=&pagenum=3&yrstart=1971&yrend=1975 - 71CC |
Posted By: p/allen
Date Posted: March-05-2008 at 9:55pm
|
Is it possible the engine is briefly cutting out ? making it feel like the trans is popping out . ------------- Pat http://i175.photobucket.com/albums/w146/72ccfan/100_5977-1.jpg - My 72 Skier Rock River Dixon,ILL. |
Posted By: eric lavine
Date Posted: March-06-2008 at 10:19am
|
good point P, thats definitely a possiblitity ------------- "the things you own will start to own you" |
Posted By: Bigcity
Date Posted: March-06-2008 at 6:55pm
|
Hey Waterlover I don't know if this is whats going on with your boat but last season I had a similar situation.
I was just getting a skier underway and struck a submeraged (sinker) log, I immediately cut the throtle back and tried to assess the damage. Without being able to get under the boat and being in the river I could not see what might be going on so I did a series of holeshots, turning at speed etc. At inital engagement of the tranny and at speeds below or above 30mph it all seemed fine. What was happening was at approximately 30mph the prop would cavitate sounding as though the prop or tranny was slipping. I took the boat out of the water and discovered that the front tracking fin was bent at a right angle altering the waterflow over the hull and causing the cavitation. The repair at $90 was a relief and we are good to go. Hope your situation is as painless as mine. BIGCITY |
Posted By: nates78ski
Date Posted: March-06-2008 at 7:19pm
|
Ron took the words out of my mouth...mine's done it a couple times, sounds like cavitation.
Nate ------------- Nathan http://correctcraftfan.com/diaries/details.asp?ID=1463&sort=&pagenum=3&yrstart=1978&yrend=1978" rel="nofollow - My '78 Ski Nautique <a href="http://photobucket.com/Nates78ski" rel="nofoll |
Posted By: 05 210
Date Posted: March-06-2008 at 11:36pm
|
Hmmm,Now that the guys above mentioned it...I was doing something I probably shouldn't have been doing with my bro-in-laws Mastercraft last year and it cavitated.Kind of felt just like hitting something in the water.Scared the sh*t out of me.
Mike ------------- http:/diaries/details.asp?ID=2219" rel="nofollow - Air Nautique 210 Team 640 hours, not 1 regret |
Posted By: 98SportNautique
Date Posted: March-06-2008 at 11:59pm
|
Hmmm Note to self dont let Mike use my boat unless of corse its a Mastercraft. ------------- 98 Sport Nautique |
Posted By: eric lavine
Date Posted: March-07-2008 at 12:30am
|
now I know why when I tear into some trannys that there is absolutely nothing wrong with them. lol a mans gotta make a living,
as i said its hard to diagnose a trans problem, if a problem at all, with the descriptions of the symptoms sometimes ------------- "the things you own will start to own you" |
Posted By: 05 210
Date Posted: March-07-2008 at 12:44am
I'll drink to that ,Eric.
Note to self...Don't tell Mike to go ahead and put your boat to the test,and then decide to stay on the dock while such test takes place  Mastercraft or otherwise
Mike ------------- http:/diaries/details.asp?ID=2219" rel="nofollow - Air Nautique 210 Team 640 hours, not 1 regret |
eric lavine wrote:Posted By: 98SportNautique
Date Posted: March-07-2008 at 12:59am
|
I agree but if my zx14 was making a noise around 185 mph only in turn two at Daytona would you ride along to figure it out? ------------- 98 Sport Nautique |
Posted By: critter
Date Posted: March-07-2008 at 12:18pm
I would  , and bring along some Oreos for a snack. ------------- 1980 Ski Nautique 1966 Barracuda |