Forgot to mention that - we've checked and replaced the valve stem seals.
They were fine, as it turns out, and we're back to square one!
(But I'm about to go and check the distributor right now!)
>From: "Robb Pynes" <robbpynes@continet.com>
>To: "Stephen McCartney" <sgam@hotmail.com>
>Subject: Re: Tearing my hair out!
>Date: Thu, 1 Feb 2001 10:42:07 -0800
>
>Have the same problem.
>
>I think it's bad valve seals
>
>Do you use much oil ??
>
>Robb Pynes
>robbpynes@continet.com
><http://www.continet.com/exe/2000/hq.htm> U-20 Bomber Page
><http://www.ncnwest.com> My Company
>(541)-342-4500
>
>Eugene, Oregon
>
>'69 2000 RHD "Red" Special class award winner Shasta '98
>'69 2000 LHD What Color do you want ? Unstarted Project Car
>'70 2000 LHD "Black" 3rd Place Modified Class Shasta '99
>
>----------
> > From: Stephen McCartney <sgam@hotmail.com>
> > To: datsun-roadsters@autox.team.net
> > Subject: Tearing my hair out!
> > Date: Wednesday, January 31, 2001 3:00 PM
> >
> > Maybe you guys can help.
> >
> > Here's the thing. No. 3 cylinder is sometimes missing.
> > Symptoms:
> >
> > No. 3 starts missing, there's still a spark going to the plug, but the
>plug
> > is fouling. Pull it, and it's black and wet.
> > When it's running on three, it does start to blow a lot of smoke, and
>STINKS
> > of petrol.
> > Clean it up, it works fine. For a while.
> > Also, the problem is always more persistent on hot days. There's a heat
> > shield missing between the exhaust manifold and the carbies, and what
>with
> > the fuel I'd been running, we thought it might have been a fuel problem,
>but
> > been running nothing but optimax through her since, and have just
>changed
>
> > the fuel filter, pulled the carbies apart(no problem - just a leak at
>the
>
> > gasket for no. 3, now fixed).
> >
> > Compression test shows that all cylinders are at 140psi - apparently a
> > little lower than standard, but they're all the same! One possibility
>is
>
> > that when the engine was rebuilt (about 5 years ago) pistons from a
>Datsun H
> > series engine were put in (exactly the same as from my U series engine,
>but
> > with a concave top, instead of a flat top).
> > Another possibility is that although Nissan factory rings were used, the
> > engine *is* 30 years old, and maybe needed larger rings. But why is it
>only
> > no. 3 that's fouling? And why isn't the compression lower on no. 3?
>We're
> > confused, baffled, and I'm tearing my hair out.
> >
> > Also, there is an aftermarket thermo fan which is pulling lots of
>current,
> > maybe the spark just isn't quite enough, at times?
> > (That's me being hopelessly optimistic, so as not to have to spend mucho
> > dollars on a rebuild.)
> >
> > Any ideas on what this problem could be?
> >
> > Cheers,
> >
> > Steve
> > (SR311-01113)
> >
> >
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