I would respond by referring to the appropriate workshop or SU manual.
Specifically, the MGB Workshop Manual says:
Examine the piston assembly for damage on the piston rod and the outside
surface of the piston. The piston assembly must be scrupulously clean. Use
gasoline or methylated spirit (denatured alcohol) as a cleaning agent. Do
not use abrasives. Wipe dry, using a clean dry cloth. Clean inside the
suction chamber and piston rod guide using gasoline or methylated spirit and
Okay, I'm being a bit pedantic. The point is that this is not an accepted
maintenance procedure. Admittedly, one might want to try the judicious use
of crocus cloth, but if a piston is sticking in the suction chamber because
of scoring, the assembly probably should be replaced.
----- Original Message -----
From: "Charles & Peggy Robinson" <email@example.com>
To: "Bill Schooler" <firstname.lastname@example.org>
Cc: "mghirsch" <email@example.com>; <firstname.lastname@example.org>
Sent: Saturday, October 27, 2001 5:43 PM
Subject: Re: HIF4 questions
> I'll bite, Bill. What would you use to remove score marks?
> Bill Schooler wrote:
> > Maynard,
> > Could you give an explanation of the relationship of piston height to
> > I suspect that a "hanging piston" would tend to cause an otherwise
> > well-tuned engine to run rough and stall. And who ever told you to use
> > emery cloth on the piston/suction chamber? From what I've read in the
> > various workshop and SU manuals, this is considered to be a real
> > Bill
> > ----- Original Message -----
> > From: "mghirsch" <email@example.com>
> > To: <firstname.lastname@example.org>
> > Sent: Friday, October 26, 2001 3:06 PM
> > Subject: Re: HIF4 questions
> > > One reason for the increased rpm when it is hot could be that a piston
> > > hanging up and not going all the way down. Pull the dashposts, check
> > > piston and the inside of the dashpot for foreign materials, and
> > reassemble.
> > > If there is scoring, you may want to use emery cloth.
> > >
> > > Maynard HIrsch
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