Rick Morrison wrote:
>
> On Sat, 14 Jun 1997 21:37:40 -0400 (EDT) GMGoodman@aol.com writes:
> >My '72 B has a condition I can't figure out. When idling in neutral
> >and the
> >clutch pedal is depressed the idle rpms drop.......release the pedal
> >and the
> >rpms come back up......darned if I can figure it out.....but I'm not
> >to smart
> >..any ideas?
> > Thanks in advance Jerry
> >
> Jerry,
> The drop in RPM is most likely caused by an increase in drag on the
> engine caused by the pressure of the release bearing on the pressure
> plate.
> Two possible causes
> 1. A worn and dragging release bearing .
> 2. Excessive play in the thrust bearings on the #3 main bearing cap.
> When the clutch in depressed, the crank actually moves slightly in the
> engine, putting more load on the thrust bearing than in otherwise has.
> The increased friction causes the RPM to drop.
>
> Hope this helps.
>
> Rick Morrison
> 72 MGBGT
> 74 Midget
Most certainly agree with Rick. There's something wrong. Have never
experienced a decrease in rpm associated with application of the clutch
in my car (the MGB). Any funny noises when you depress the clutch? If
so, the throwout bearing would be the prime suspect.
--
*Bill Schooler *Check the MGCC Wash DC Centre Web Page
*Woodbridge, VA *http://members.aol.com/mgccwdcc/
*schooler@erols.com *Editor of The Spark
*69 B/GT, 53 TD *Web Page Coordinator
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