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augidog
Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey
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 Posted: Fri Apr 06, 2007 1:26 am Post subject: flywheel pull |
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Can I get to the flywheel if I pull the tranny back? If so can I get it out with just the car on jacks? I need to pull it because its 180 degrees out and I'm pretty sure something around there is out of balance. Can I get it resurfaced? With installing the the new clutch they never pulled the flywheel. Do I have to drop the exhaust to pull the tranny back? Thanks.
Pick any one or all questions to answer. Receive a discount if you pick 2 or more.
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work. |
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Ozzie
Joined: 12 Mar 2005
Posts: 4448
Location: Townsville, Qld. Australia
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| Posted: Fri Apr 06, 2007 7:19 am Post subject: |
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How did you conclude its 180 out?
Do the oil pulley and flywheel marks line up?
If so then its not 180 out.
The flywheel is on the back of the motor and in front of the torque tube.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance |
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endwrench
Joined: 07 Dec 2002
Posts: 1631
Location: Victor, Montana
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| Posted: Fri Apr 06, 2007 7:25 am Post subject: |
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4 speed or 5? The snail tranny can be pulled back for access but I think it may be jast as easy to pull it. I think Joe did a write up on this in the HOW-To section. 4 speed can be pulled back too but you need to cut a panel out of the spare tire well to make room. You just patch it back in when your finished.
Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!.... |
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augidog
Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey
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| Posted: Fri Apr 06, 2007 9:10 am Post subject: |
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| Ozzie wrote: | How did you conclude its 180 out?
Do the oil pulley and flywheel marks line up?
If so then its not 180 out.
The flywheel is on the back of the motor and in front of the torque tube. |
Oil pulley and cam mark dead on. nothing is in the bell housing window untill I rotate it a lot ,only then will the timing marks will come into view.
Endwrench- your right .I will probally just swap a spare trans I have in. It is a 4 speed. I've read that just flopping things 180 can clear up bad vibrations. Ever since a mech did my clutch I've noticed this vibration. Its getting worse.I'm assuming the flywheel. Its the only thing they did not touch and it has always been 180 out from the past owner.
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work. |
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endwrench
Joined: 07 Dec 2002
Posts: 1631
Location: Victor, Montana
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| Posted: Fri Apr 06, 2007 1:36 pm Post subject: |
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Augidog,
It shouldn't matter how the flywheel is clocked in relation to a vibration. 924's are balanced internally and the flywheel is just dynamically balanced to its center. I actually don't think you can even put the flywheel on wrong. The bolt holes are offset so it only goes on one way. Your vibration is probably a bent or bad disc or a badly balanced or off drilled pressure plate. Can you feel the vibration with the clutch pedal up or down?
Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!.... |
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augidog
Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey
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| Posted: Fri Apr 06, 2007 1:48 pm Post subject: |
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| endwrench wrote: | Augidog,
It shouldn't matter how the flywheel is clocked in relation to a vibration. 924's are balanced internally and the flywheel is just dynamically balanced to its center. I actually don't think you can even put the flywheel on wrong. The bolt holes are offset so it only goes on one way. Your vibration is probably a bent or bad disc or a badly balanced or off drilled pressure plate. Can you feel the vibration with the clutch pedal up or down?
Todd |
Thanks, if that true I can cross another one off the list.
With the clutch pedal up or down the vibration is still there,but it is so strong in gear that I only ride under 3500 rpm so it does not happen.
It allready blew out my second vibration damper.
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work. |
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Ozzie
Joined: 12 Mar 2005
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Location: Townsville, Qld. Australia
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| Posted: Fri Apr 06, 2007 5:38 pm Post subject: |
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Torque tube bearings?
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
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augidog
Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey
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| Posted: Fri Apr 06, 2007 11:16 pm Post subject: |
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| Ozzie wrote: | | Torque tube bearings? |
That was my thought . If I'm going to swap the tranny, will the torque tube slide all the way out once disconected from the front?I'll swap that in also if I can.I have not seen any write ups on Torque tube removal.I still don't know if thats it but since I'm there. I would hate to do the swap and find out its up front.The trans case is saturated with fluid.Its taking a beating from somewhere or failing.
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work. |
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endwrench
Joined: 07 Dec 2002
Posts: 1631
Location: Victor, Montana
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| Posted: Sat Apr 07, 2007 3:08 am Post subject: |
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Sitting still the vibration should go away when you depress the clutch pedal if it is torque-tube.
Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!.... |
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-nick
Joined: 16 Nov 2002
Posts: 2699
Location: Cambridge, MA
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| Posted: Sat Apr 07, 2007 3:12 am Post subject: |
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^ and in gear. It will spin a little if you have the clutch depressed but you're in neutral.
If you're going to pull the transmission out anyway, then start up the engine after you do and see if you still get the vibrations. That will narrow it down to trans or not easily.
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1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Fri Apr 13, 2007 1:06 am Post subject: |
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| -nick wrote: | | That will narrow it down to trans or not easily. |
...if you call pulling the transmission easy! 
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
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leadfoot
Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia
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| Posted: Fri Apr 13, 2007 12:07 pm Post subject: |
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If it's the torque tube engine vibration will not be that noticable until higher RPMs and even then it won't rock the engine that much... you will hear the sound coming from underneath the gear shift lever...
It will also slowly be really loud at higher RPMs in gear but as sson as you depress the clutch it will dissapate...
It will also stay there if you accelerate to high rpms and then deccelerate with the clutch pedal up and dissipate as the rpms drops back down to 2000 odd...
You migh also experience a grindind noise if it gets really bad.
Maby the clutch wasn't centered properly on refit...??
Leadfoot
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1981 ROW 924 Turbo -
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!tom
Joined: 28 Aug 2006
Posts: 1941
Location: Victoria, BC Canada
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| Posted: Fri Apr 13, 2007 2:13 pm Post subject: |
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If the clutch weren't centered, the pilot shaft (or torque tube or prop shaft or whatever you want to call it) wouldn't fit into the pilot bearing in the flywheel.
Perhaps the pilot bearing is shot, allowing the mis-alignment idea of Leadfoot to happen.
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78 924 NA
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augidog
Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey
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| Posted: Mon Apr 16, 2007 2:58 am Post subject: |
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This was replaced Jan 06 by a mech. I wish I knew then what I know now, but it was winter.
| augidog wrote: | Well the cars is back.
Clutch kit 428.99 Sach
Clutch guide 32.99
Pilot bearing 34.86
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Could all this have failed allready?
A dumb question, was the release bearing in the kit?
If not could that be the problem?
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work. |
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Paul
Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin
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| Posted: Mon Apr 16, 2007 3:11 am Post subject: |
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| -nick wrote: | ^ and in gear. It will spin a little if you have the clutch depressed but you're in neutral.
If you're going to pull the transmission out anyway, then start up the engine after you do and see if you still get the vibrations. That will narrow it down to trans or not easily. |
I don't recommend this since the drivetrain is held by 4 mounts, 2 on the motor and 2 on the tranny. If the torque tube is still installed, I suppose you could secure it to the torsion tube carrier.
Has anyone ever done this?
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
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Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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