the flyin' scotsman

I just finished installing (GTS) new motor mounts and delrin strg rack bushings (thx Roger). All went per Dwaynes epic write up with the usual challenges with cross member but its all done, bolts torqued to spec etc.

The engine rocks as it should when blip the throttle so went for a installation lap (F1 speak).

The steering is tight nice change and the car is smooth up to 5k rpm then starts to vibrate.

Its very pronounced through the clutch pedal and gear shift lever and when is upshifted the clutch pedal doesn't return to full position.......like the throw out lever is sticking which indicates the TO bearing issue???

It did same prior to the work.

Appreciate your inputs

69gaugeman

Does the vibration stop when you push in the clutch?

the flyin' scotsman

no vibes below 4.5k rpm.....clutch in or out

69gaugeman

If the vibration is there when you press the clutch, then the problem is in the engine/ clutch area. I would look at the pressure plate. I have installed it wrong and pushed the locating pins in. Then it wasn't centered on the flywheel. Not saying it is that, but I can't see anything else that would cause that vibration when the clutch is pressed.

GlennD

Malcolm,

Must be a Calgary thing. I am fighting the same issue. I think I have mine narrowed to the front bearing on the torque tube having migrated rearwards.

Have a look at mine thread. Maybe some hints on things I have tried. I too have a vibration albeit at a lower RPM. If I put in my clutch and put the car into gear (to ensure the drive shaft has stopped), there is no vibration.

How you been keeping anyways? It's been a while

Glenn

Speedtoys

I wonder how many people with odd vibration issues, have a front damper with rubber starting to degrade.

Lizard928

check your torque tube bearings have not migrated in too far....

Hilton

How much space between the trans and the rear cross member? Might be time for replacement mounts.

UpFixenDerPorsche

Re check your harmonic balancer (have you access to a good one to swap out?).

While it may 'look' ok that doesn't mean it IS ok.

69gaugeman

I thought torque tube first as well. But the vibration is there clutch in or out. I assume same vibration regardless of gear. That would preclude the toque tube bearings from being suspect. Dropping into neutral while moving and pressing the clutch and still having the vibration would eliminate the torque tube as a suspect, no? Also while stationary, while in gear with the clutch depressed if the vibration is still there that would certainly eliminate the toque tube from the equation, as the torque tube would not be spinning at all.

the flyin' scotsman

thx Glenn, I just saw your thread for the first time good reading with suggestions albeit I believe a different issue.

The car is smooth still or in motion up until higher rpm when the bad vibes start although I don't rev it that high sitting in the garage

I'll try a few suggestions on this and your thread then report.

Doing well thx.......very busy year

UpFixenDerPorsche

What is it about you lot?

Seems to me that you would rather the "problem" was mysteriously complicated and ultra technical just so you can brag about how much hi-tech machinery and gadgets you can involve to solve your "problem" rather than start with simple basic deductions and work from there.

As I used to tell my field techs: "before you pull out the crankshaft, check you have fuel in the tank". Yeah. Sounds trite, but you wouldn't believe the number of times ...

Finally, how about some courtesy to respondents? Apart from the time/effort it takes to respond, remember they have acquired their knowledge base through years of hard work and disappointment.

If you want to continue to hear from these folk then you should have the manners to thank them for their contribution.

John C.
Engineer and 14 years ownership.

SeanR

.........

the flyin' scotsman

Many of the respondents know each other personally, seen there cars up close and shared a beverage or 2 together.......no worries mate.......theres petrol in the tank

On topic; the previous owner had clutch work done but wasn't specific what was fixed/replaced. In my ownership the the slave and master cyl. and flex hose have been replaced so I'll drop the bell housing cover and have a peek......easy to do with a x pipe.

I also hear a noise at idle that goes away with light touch on the clutch pedal.....as if its taking up slack again as if the TO brg is sticking on the shaft.

Given work is not too hectic Ill get her out for a another test drive this aft.

Dave928S

Just replaced the throwout bearing (and WIWAIT the rest of the clutch) in my work 4WD, which was doing exactly the same thing. Sounded like I had a cheeping bird in the clutch, which was driving me nuts. The bearing was toast, and once replaced was not only quiet again, but a small vibration had gone as well.