Thanks Maynard for the info. I am not sure that this is required, since if
there is oil pressure, there is always an oil film between the valve and its
"seat", which helps improve the seal. Also it seems like as long as there is
sufficient spring pressure, it will seat with time.
Neither Haynes nor Bentley mention this process, but they do stress making
sure that the cup appears in good shape and the spring is 3" long. Only in
Burgesses "How to Power Tune MGB 4 cylinder engines" did a find a reference
to lapping the valve, to improve pressure at idle.
What do the other list gurus think? Does the lapping actually help?
Tim Economu
1969 MGBGT
> ----- Original Message -----
> From: "mghirsch" <mghirsch@netzero.net>
> To: "Tim Economu" <economu@whidbey.com>
> Sent: Tuesday, September 11, 2001 1:40 PM
> Subject: Re: Low pressure after rebuild
>
>
> > You should do this before the engine was put in the car. What you do is
> > take the valve and stick it on a rod or pencil. Take a little valve
> > grinding compound and put it on the valve, place the valve in the port,
> and
> > spin back and forth. Then clean thoroughly. If you try to do this in
an
> > engine with the crank and/or rods in place, you will never get all the
> > abrasive out and you will do more harm than good.
> >
> > Maynard
> > ----- Original Message -----
> > From: "Tim Economu" <economu@whidbey.com>
> > To: <mghirsch@netzero.net>
> > Sent: Monday, September 10, 2001 11:29 PM
> > Subject: Low pressure after rebuild
> >
> >
> > > > You said...
> > > Subject: Re: Low pressure after rebuild
> > >
> > > Also, the relief valve should be lapped in place before assembly.
> > > >
> > >
> > > What exactly does this mean? What do you lap it with, while it is in
> > place?
> > > Thanks in advance...
> > >
> > > Tim Economu
> > > 1969 MGBGT
> > Only $9.95 per month!
> > Sign up in September to win one of 30 Hawaiian Vacations for 2!
> > http://my.netzero.net/s/signup?r=platinum&refcd=PT97
///
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