torque convertor question
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crackerass
- Posts: 29
- Joined: Fri Sep 26, 2003 5:56 am
torque convertor question
o.k so i need to know how i get my torque convertor off.... i have a nissan service manual and it says to push and turn but when i push and turn nuthing happens and i also see that are 4 bolts that connect to what i think is the flywheel.. do i take those out then push and turn??? i dont know im confused.. any help would be great... and i searched but found nothing useful... i have a 90 240sx se
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yellow_jacket
- Posts: 1355
- Joined: Mon Jan 13, 2003 4:43 pm
- Car: 95 240sx
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crackerass
- Posts: 29
- Joined: Fri Sep 26, 2003 5:56 am
only when installing the covertor when the trans is out. its called seating the convertor on the input shaft of the trans. when following that procedure your are spining the trans input shaft till the 2 slots for the trans pump align. which will allow the convertor to seat properly before mounting the engine to the trans.
So, it looks like you're going to be able to get your torque converter off, but why? Are you having it modified for a higher stall? What stall speed? What company is doing it?
I'm going to do the same eventually. Level 10 looks good, but JMO and Precision Industries seem okay as well. Plus, JMO is about half the price. But, there's the old, "You get what you pay for." Let me know how things work out for you.
I'm going to do the same eventually. Level 10 looks good, but JMO and Precision Industries seem okay as well. Plus, JMO is about half the price. But, there's the old, "You get what you pay for." Let me know how things work out for you.
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crackerass
- Posts: 29
- Joined: Fri Sep 26, 2003 5:56 am
well the reason i am taking it off is because i believe it is the problem with the transmission .. i'll explain the problem .. when i put the car in drive it will move o.k until the car gets up to temp. and then i have to rev the engine to about 2,000 rpm and then the transmission acts like it is a slippling clutch .... revs then grabs if anyone has heard of this or has this problem any help will be very appectiated.
Sounds like the hydraulic line pressure within the transmission isn't sufficiently high to exert enough clamping pressure on the clutch packs.
The fluid pump assembly behind the converter could be the cause, but it's probably the TCM (transmission control module). Basically, the TCM regulates the line pressure. When the transmission is below normal operating temperature, the TCM maxes out the line pressure. That's why the auto transmission always shift kind of hard and harsh when it's cold. It does this for two reasons: to bring the temps up quicker and to ensure good clutch clamping force while the fluid is at low viscosity.
At normal operating temps, the line pressure is controlled by the TCM according to throttle angle, RPM, and transmission output shaft speed. If something electronic malfuntioned, or you screwed with one of those sensors or any of the associated electronics, that would cause your problem. Some of these sensors and connectors are under the hood, far away from the transmission, so you may not have realized that you were messing with something related to the transmission.
It's not the torque converter and probably not the pump, just because the pump seems able to supply sufficient line pressure, otherwise it would slip even when it was cold.
If the slipping is happening in all gears and at all speeds when the transmission is warm, then you should get it fixed as soon as possible. It really does sound like it's a "simple" electrical problem at this point, but if the clutches are slipping like that due to low line pressure, then the extra heat that is generated will kill your transmission pretty quickly.
Still, if you decide to get you converter rebuilt, you might consider sending it to JMO and having it modified for a 3000 RPM stall at the same time. They have a special going on for $350 right now.
Also, I have a '93 A/T TCM that I have no use for. If you find out that you need one, I'll sell it to you for $50 shipped. I don't know if it will work in other years, but it might.
Let us know how things are going and what you end up finding out about your problem.
The fluid pump assembly behind the converter could be the cause, but it's probably the TCM (transmission control module). Basically, the TCM regulates the line pressure. When the transmission is below normal operating temperature, the TCM maxes out the line pressure. That's why the auto transmission always shift kind of hard and harsh when it's cold. It does this for two reasons: to bring the temps up quicker and to ensure good clutch clamping force while the fluid is at low viscosity.
At normal operating temps, the line pressure is controlled by the TCM according to throttle angle, RPM, and transmission output shaft speed. If something electronic malfuntioned, or you screwed with one of those sensors or any of the associated electronics, that would cause your problem. Some of these sensors and connectors are under the hood, far away from the transmission, so you may not have realized that you were messing with something related to the transmission.
It's not the torque converter and probably not the pump, just because the pump seems able to supply sufficient line pressure, otherwise it would slip even when it was cold.
If the slipping is happening in all gears and at all speeds when the transmission is warm, then you should get it fixed as soon as possible. It really does sound like it's a "simple" electrical problem at this point, but if the clutches are slipping like that due to low line pressure, then the extra heat that is generated will kill your transmission pretty quickly.
Still, if you decide to get you converter rebuilt, you might consider sending it to JMO and having it modified for a 3000 RPM stall at the same time. They have a special going on for $350 right now.
Also, I have a '93 A/T TCM that I have no use for. If you find out that you need one, I'll sell it to you for $50 shipped. I don't know if it will work in other years, but it might.
Let us know how things are going and what you end up finding out about your problem.
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crackerass
- Posts: 29
- Joined: Fri Sep 26, 2003 5:56 am
wow thanks alot that sheds some light on things because the torque convertor seems to be in good condition ... but i dont know if the slipping is in all gears because the car wont go any faster than maybe 25 mph and when it gets around there it just seems like it looses grip and the engine revs... due you still think the tcm is the problem??? and do you think this is something i could do by myself?? or would this be a good time to swap to a 5 spd.
Time to do some troubleshooting.
First, what year is your car?
Second, will it shift out of first when it's cold or hot, or does it never get out of first?
If it won't leave first gear, put the gear selector in first gear and try it again, first with part throttle, then again, but flooring it. Does it still slip?
Third, is it the same under full throttle versus partial throttle acceleration? (There's higher line pressure at full throttle.)
It could be trying to shift into second under partial throttle at 25 mph and the line pressure isn't high enough to engauge the clutches, so it just spins the converter faster. One of the sensors could need replacing. If you have the actual Nissan service manual, there's over 100 pages about the auto transmission, along with a ton of troubleshooting stuff to follow. If you need help or have a question, get back to me, and I'll help when I can.
As far as a five speed swap goes, it can be a pain too. I actually have a five speed in my garage. I may swap it in eventually. The hardest part of the whole swap is hunting down all of the little stuff. The transmission itself is easy. Try finding a master cylinder, slave cylinder, brake and clutch pedals, etc. Easy if you can gut a wreck, but if you have to piece it together, good luck.
Plus, making an auto kick *** will just further shame any car that gets walked by it in the future.
First, what year is your car?
Second, will it shift out of first when it's cold or hot, or does it never get out of first?
If it won't leave first gear, put the gear selector in first gear and try it again, first with part throttle, then again, but flooring it. Does it still slip?
Third, is it the same under full throttle versus partial throttle acceleration? (There's higher line pressure at full throttle.)
It could be trying to shift into second under partial throttle at 25 mph and the line pressure isn't high enough to engauge the clutches, so it just spins the converter faster. One of the sensors could need replacing. If you have the actual Nissan service manual, there's over 100 pages about the auto transmission, along with a ton of troubleshooting stuff to follow. If you need help or have a question, get back to me, and I'll help when I can.
As far as a five speed swap goes, it can be a pain too. I actually have a five speed in my garage. I may swap it in eventually. The hardest part of the whole swap is hunting down all of the little stuff. The transmission itself is easy. Try finding a master cylinder, slave cylinder, brake and clutch pedals, etc. Easy if you can gut a wreck, but if you have to piece it together, good luck.
Plus, making an auto kick *** will just further shame any car that gets walked by it in the future.
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crackerass
- Posts: 29
- Joined: Fri Sep 26, 2003 5:56 am
1. 90 2. it dosent matter if it hot or cold andi've tried it in 1st and no luck still the same thing happens...3.well when i first start it up everything works fine... under full throttle or half but whenever the transmission is up to operating temp it just stops working or whenever it is on a hill it wont make it up .... after it warms up the transmission does nothing just revs and makes wierd *** noises ... i think im just gunna take the transmission to the shop and ask em if it any good cause its already out of the car and it has over 150,000 miles on it... and hey where did u find the higher stall speed convertors??? i might just have to take a look at them.... thanks alot for the help
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Structure240sx
- Posts: 5615
- Joined: Sun Oct 06, 2002 5:04 pm