Connect your timing light to the #3 plug wire, and while it is running look
at the light and see if it is intermittent.
-----Original Message-----
From: Stephen McCartney <sgam@hotmail.com>
To: robbpynes@continet.com <robbpynes@continet.com>
Cc: datsun-roadsters@autox.team.net <datsun-roadsters@autox.team.net>
Date: Thursday, February 01, 2001 7:53 PM
Subject: Re: Tearing my hair out!
>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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