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| Auto Slipping when hot | |
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| Tweet Topic Started: Thu Jul 23, 2009 2:09 pm (2,169 Views) | |
| arkudos | Thu Jul 23, 2009 2:09 pm Post #1 |
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Still a Noob
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Hello fellow 190ers, glad to join the club, you lot are awesome compaired to the yanks....so let's get to the problem. Read most of the threads reagrding slipping, doubt if my problem fits into the others so..... My ride is the 1983 2.0 auto gearbox, and fully serviced with minor niggles. So after the service and after a very hot day here in Greece, got caught up in traffic and did a stretch of about 1.5 km in 25-30 minutes, at the end I just wanted to get out of the jam pressed the gas revved up ok till 3500 then started slipping, 1st and 2nd... till it cooled down (about an hour) with everything back to norm, didn't put much thought into it,till it did it again, the funny thing is starts in 1st after it heats up no matter how soft I press the gas. Before the service the gearbox was sort of rough with gears kicking in when cold but ok after it warmed up. Colour of the juices were a nice pink/red from the gearbox, yellow/brown from the clutch. So...can anyone help... or do I have to take up north? |
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| kentronix | Thu Jul 23, 2009 2:39 pm Post #2 |
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I'm only really here for the Kitchens
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Have you checked the gearbox fluid level ? That would be my first suggestion. Welcome to the forum by the way
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| Stempies | Thu Jul 23, 2009 2:43 pm Post #3 |
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Hot Lips
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"yellow/brown from the clutch" ..Think you'll find that's your brake resevoir! Did they change auto fluid in service? Sounds like not enough fluid, check level according to the manual! EDIT; Ooops you beat me to it.....................sloooooow typer me!!! 2nd opinion always helps though!
Edited by Stempies, Thu Jul 23, 2009 2:50 pm.
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| arkudos | Thu Jul 23, 2009 3:19 pm Post #4 |
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Still a Noob
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Kentronix, fluids were changed with MB auto fluids, cost and arm and a couple of legs, mechanic is an awesome bloke, cleans EVERYTHING....small drop..cleans, saw a bit of dust cleaned, well worth the monet he got paid, anyway it was a full service for both engine and auto box. Stempies as for the yellow/brown from the brakes, did that when I got the ride (still can't believe I've got a Merc) , as for the yellow/brown from the clutch, that's what it was.... turned the engine (mechanic) found that small screw or whatever, stuck an allen polll in there and out came that gue. Ever since (managed to do 1500 kms after service) car slips when hot, forgot to mention that it is a smooth as WOW when cold and normal driving, problem is if I get stuck in traffic what next, do I blow the gearbox or...as I read it needs tuning for more pressure somewhere on the left because in theory the warmer it gets the more thinner the fluids get so it needs more pressure... Anyway.... |
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| algord83 | Thu Jul 23, 2009 4:54 pm Post #5 |
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I can count to potato
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Welcome to the forum mate. Sorry to hear about your problems. your auto box does not have a clutch as such. Under your bonnet you will find two dip-sticks, both at the left of the engine block. The one near the back is your auto box fluid level. This fluid provides hydraulic pressure for your torque converter and lubricates all your goings on in there. The one near the front is your engine oil. This lubricates the engine and has no contact with the gearbox. Clutches would not work if they had oil on them, but you have an auto, so don't worry about that. Remember, even a good mechanic can make a mistake. So, to check your auto fluid (transmission fluid) level. get the car nice and warm and drive it around for a bit. let the car get into every gear on the run. Now, stop on level ground and with your foot on the brake and the engine still running, select each gear in turn for 5 seconds. Now put it in 'P', handbrake (parking) brake on, leave the engine running, pop the bonnet and get out. Have a clean cloth ready and remove the transmission fluid dipstick (remember to undo the clip ). Wipe the stick and then put it back and check again. The fluid should be a nice pinky red colour and should not be too low or too high. There are marks on the stick for you. If you want to check the engine oil level do it with the engine OFF. It does not matter too much if this level is slightly high. In fact it is better that it is near the top than the bottom. This should be a golden brown colour if it has just been changed. If the car was fine before the service I doubt it is a major problem. I'd only worry if your transmission fluid was brown and smelled burned. This can mean bad autobox worries. I hope this helps. Keep us posted. Al |
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| arkudos | Thu Jul 23, 2009 5:29 pm Post #6 |
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Still a Noob
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algord83.... thanks mate! Takes foot out of mouth..."torque converter", my mechanic calls it a clutch, bad translation then. Right then, already done that, read somewhere, when cold the transmission fluid should be on the bottom line, when hot at the top line .... mine is spot on cold and hot. So the yellow/brown came out of the torque converter...didn't sniff it though. Already blown an auto gearbox...relax it was in the land of OZ... VN Holden Commodore, so I really want to take care of this beauty of a Merc that I got. |
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| algord83 | Thu Jul 23, 2009 5:38 pm Post #7 |
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I can count to potato
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Yep mate. Your torque converter is what provides the main coupling between the engine and the gearbox. manual gearboxes have a clutch to do this job. The transmission fluid is for the whole gearbox, It shouldn't really be yellow, although some brands of fluids are, the red is just a dye, some don't add it. Just to be confusing, there are parts of an auto box called 'clutches' these are not like a manual clutch, its all a bit complicated in there and i'll be buggered if I understand it fully ![]() What I do know, is that burning smells from the box, burned smelly fluid and lazy gear-changes can mean auto-box disasters as the 'clutches' are burning. Al |
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| chrismatheou | Thu Jul 23, 2009 5:41 pm Post #8 |
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Enthusiastic Bad Boy
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Welcome aboard fellow Greek Are you saying that the slipping when hot started after you got the car serviced? |
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| arkudos | Fri Jul 24, 2009 6:28 am Post #9 |
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Still a Noob
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algord83... thanks for the info, so what's your opinion (or anyone) on the yellow gue that came out of the torque converter? chrismatheou... geia sou file! After the service car slips after the autobox gets hot and I'm stuck in traffic!? Like I wrote previously, once it gets hot, it starts in first!, that's how I know it going to slip. ps....in your sigs are your rides?...I'm going to cry...freaking Greek laws! |
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| arkudos | Sun Nov 15, 2009 9:17 pm Post #10 |
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Still a Noob
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Just for your info, in the end it was the vacuum modulator that was causing the problem of slipping. Basically it took time to figure it out because my mechanic first wanted to try out a few things. Cleaned the radiator to make sure that wasn't the problem, then he turned the litte switch clockwise to add pressure which would work, but on freaking hot days during the summer it kept on slipping, anytime the temp was above 85-90 degrees... it would slip "only" the second time I'd slam the gas pedal...more tweaking of the switch...anyway being hot up until the end of September and finding the modulator (which took threes weeks) got it fitted and now while in traffic it does reach the 85-90 no slipping at all! Thanks to all and regards.... |
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9:17 AM Jul 11