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GJF GJF is offline
Slantnose from HELL
 
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If it goes away as soon as you push the pedal to the floor. Then the first bearing to make noise like that would be the mainshaft bearing.
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Old 01-09-2008, 06:10 PM
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Quote:
Originally Posted by GJF View Post
If it goes away as soon as you push the pedal to the floor. Then the first bearing to make noise like that would be the mainshaft bearing.
That's what I'm afraid of.

Les
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 01-09-2008, 07:01 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #22 (permalink)
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Quote:
Originally Posted by GJF View Post
If it goes away as soon as you push the pedal to the floor. Then the first bearing to make noise like that would be the mainshaft bearing.
+1

I agree , it seems logical that the problem is in the input stage of the tranny.

I know this won't help, but let me tell you about an experience or two with Porsche trannies.

My '78 930 just had the 1-2 synchro's professionally replaced by a Porsche specialist in CA. To this day, the "specialist" says the synchros still need broken in because 2nd gear grinds on a speed shift, and you can't be going over 10 mph to shift into 1st. WTF?

Last summer I blew out the planetary gear in the front diff of my 964. I took it to a very famous Porsche specialist in Mentor, Ohio to repair. $4700.00 later I pick up the car and find as I am driving away from the dealership that my AC is no longer working. Ten miles later I notice that my oil level gage indicates low oil level. I stop at the nearest truck stop to see what is up. Logic tells me that the dealership didn't have to remove the AC compressor to drop the engine, so, the problem with the AC is probably nothing more than a minor electrical issue. (Blown fuse, loose plug.) I feel around the engine compartment behind the AC compressor, and sure enough, the compressor is merely unplugged. Great, no problem, simple human error. WTF?

I check the oil dipstick, and find the oil is down 2 quarts, this after the Specialist did a routine oil change. WTF?

Add 2 quarts, and hit the road, right? WRONG the car wouldn't start. Turn the key, nothing! Click, click, click.....WTF? Well. it finally started, and I finished the 100 mile ride home.

The next day I took the opportunity to put the 964 on the lift to try to find the starter problem. You will never guess what I found.... The specialist mechanic neglected to put a nut on the starter wire on the solenoid. WTF?

Moral of the story...WTF????

Last edited by Wolf300tt; 01-09-2008 at 07:06 PM..
Old 01-09-2008, 07:03 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)
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Bearing Noise

My release bearing failed last year, just came completely apart, clutch pedal went to the floor. Prior to this, I heard "bearing noise" from the rear, I knew what it was as it would go away when I pushed the clutch in, in fact, if I just barely put pressure on the clutch pedal the noise would go away, a week later, before I had a chance to replace it, I was sitting on the side of the road with my clutch pedal on the floor!

Tim
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Old 01-09-2008, 08:10 PM
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Quote:
Originally Posted by timc View Post
My release bearing failed last year, just came completely apart, clutch pedal went to the floor. Prior to this, I heard "bearing noise" from the rear, I knew what it was as it would go away when I pushed the clutch in, in fact, if I just barely put pressure on the clutch pedal the noise would go away, a week later, before I had a chance to replace it, I was sitting on the side of the road with my clutch pedal on the floor!

Tim
I believe I tried this but can't remember for sre. I'll give it another try.

Les
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 01-10-2008, 05:38 AM
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You may want to try this but be very careful. VERY DANGEROUS>
I had a similiar problem last summer which turned out to be my rear tire. Delaminated and only showed noise at higher speeds.
Anyway, chock the front wheels and jack the car way up in the air with jackstands under the torsion bar support points. Once the rear wheels are off the ground with at least 1 inch clearance. Sart and run the car in first and second gears. You should be able to hear the howling noise. Now once it is running , it will idle along in any gear you leave it in, you can crawl under the car and pinpoint where the noise is coming from, tranny, cv joints, flywheel, etc.
This is how I found the rear tire bad.
Good luck, but it sounds like a tranny issue from your description.
Fred
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Old 01-10-2008, 08:02 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #26 (permalink)
 
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Quote:
Originally Posted by fredmeister View Post
You may want to try this but be very careful. VERY DANGEROUS>
I had a similiar problem last summer which turned out to be my rear tire. Delaminated and only showed noise at higher speeds.
Anyway, chock the front wheels and jack the car way up in the air with jackstands under the torsion bar support points. Once the rear wheels are off the ground with at least 1 inch clearance. Sart and run the car in first and second gears. You should be able to hear the howling noise. Now once it is running , it will idle along in any gear you leave it in, you can crawl under the car and pinpoint where the noise is coming from, tranny, cv joints, flywheel, etc.
This is how I found the rear tire bad.
Good luck, but it sounds like a tranny issue from your description.
Fred
Hi,
Thanx! That's a good idea. I'm afraid it is tranny also.

Les
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 01-10-2008, 08:20 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #27 (permalink)
Smart quod bastardus
 
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Keep us posted on what you find out.
You may need a helper to sit in the car while your underneath to actuate the clutch for you to see what is going on.
Make sure the clutch is in adjustment too.
Be careful it gets hot under there too.
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 01-10-2008, 02:48 PM
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Quote:
Originally Posted by fredmeister View Post
Keep us posted on what you find out.
You may need a helper to sit in the car while your underneath to actuate the clutch for you to see what is going on.
Make sure the clutch is in adjustment too.
Be careful it gets hot under there too.
Sure thing,
Thanx Fred!

Les
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 01-10-2008, 02:58 PM
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Hrmm...I hope it's wheel but it sounds like input shaft or pinion bearing. Is pinion aligment done correctly? Backlash?
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Old 01-10-2008, 03:31 PM
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Quote:
Originally Posted by beepbeep View Post
Hrmm...I hope it's wheel but it sounds like input shaft or pinion bearing. Is pinion aligment done correctly? Backlash?
I didn't do the Transmission. I had it done by a reputable shop, but anything is possible.

Les
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 01-10-2008, 03:44 PM
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