Actual road speed doesn't matter. That
test was just to verify whether it was tranny,
driveline or engine.
Whether at 15 or 50 mph the vib. comes in
(is noticeable) at 2.5K and seems to fade above
3 krpm range regardless of gear selection.
Some have suggested 'components' contacting
the frame or weak mounts. All mounts are new
within the last 6 months/500 miles. With the tranny
out of the car... there was no vibration.
The last test was ...tranny out with a jack under the
rear of the engine, all 'front end' stuff (water plumbing etc)
still connected.
Rev'ing and holding the idle through the 2.5-3krpm
range was silky smooth (the engine does have new
balanced components ...pistons etc)
The pilot bushing was a bit of a sloppy fit on the
input shaft of the tranny when I pulled the bush and
checked it on the front of the tranny (input shaft)
I spun up the tranny with a drill on the bench last night
but can not say for sure what rpm I went up to
(who knows a 'work loaded' drill's, real speed)
I can't say I could perceive any vibration as I varied
the speed. After a quick internal exam, all the gears
look fine with minimal slop in motion tolerances.
I'm going to put the straight four speed I have
sitting here back in with the old pilot bushing and
matching driveshaft and test. Well see what happens.
Paul Tegler
ptegler@gouldfo.com
www.teglerizer.com
----- Original Message -----
From: "ricgibson2000" <ricgibson@earthlink.net>
To: <spitfire-enthusiast@yahoogroups.com>
Sent: Sunday, January 13, 2002 11:33 AM
Subject: [spitfire-enthusiast] Re: engine vibration revisted - please read
and think a moment!
> Paul,
>
> When you say "at road speed", do you mean the same speed? Does it
> vibrate at the same engine rpm at 15mph as at 65mph? Like Paul
> Logue, I'm inclined to think of things like u joints, drive shaft,
> diff, axles, breaks, bearings and hubs. If those are all fine, then
> I'd look into the fan belts, alternator and water pump.
>
> Often when I had "clunks", vibrations, strange noises, etc.... they
> were fixed by rotating a good u joint through the system.
>
> Good luck,
> Ric Gison
>
>
> --- In spitfire-enthusiast@y..., "ptegler@c..." <wizardz@t...> wrote:
> > For those not remembering.....
> > I had a strange vibration at 2.5-3krpm in
> > my '75 Spit
> >
> > at road speed, whether in gear, or in neutral
> > drifting at speed, ...revving the engine it vibrated.
> >
> > Well I just pulled the tranny again (man I'm
> > getting good at this)
> >
> > With a jack to support the motor, clutch still attached
> > I fired it up. NO VIBRATION AT ANY SPEED!
> >
> > So... if drifting at speed in neutral, engine idling...
> > doesn't vibrate, and now with the tranny out
> > and no vibration regardless of engine speed...
> > would I be correct in assuming it HAS to be the
> > input shaft on the tranny...either the input end in
> > the crank or the bearing on the input shaft
> > in the tranny ? bent input shaft? yes there is a bit
> > of 'forceable' movement on the input shaft!
> >
> > HELP I need ideas... suggestions... even wisecracks
> > accepted at this point.
> >
> > tia
> >
> > Paul Tegler
> > ptegler@c...
> > www.teglerizer.com
>
>
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