Mark,
I have a similar problem with my '69 2000. Since my roadster really doesn't
go outside if it is raining it hasn't been too much of a problem. Living
close to Seattle and not driving in the rain probably explains why I only
put 1000 miles per on the roadster.
You mentioned your roadster had a transplanted U-20 engine -- does the
exhaust manifold slip onto the exhaust system or is there a three bolt
flange? I think my problem is caused be the previous owner breaking one of
the exhaust manifold studs and not getting the replacement aligned
correctly. My exhaust system is stock -- I replaced everything except the
exhaust manifold with new Nissan parts. You may also want to check the
"ball" on the end of the exhaust pipe that mates with the exhaust
manifold -- sometimes these are deformed by people trying to align the
engine by prying on the exhaust pipe. I have had two '69 2000's and they
both leaked at the exhaust manifold flange. Check the condition of the
flange and make sure the bolts are tight.
One rather odd feature of my exhaust leak is that it is most noticeable on
deceleration rather than acceleration. Additionally the smell is more like
oil than exhaust.
My solution has been to leave the top down or if the top is up to leave the
fresh air vents open.
Good luck
Jerry
'69 2000
'86 Alfa Romeo GTV6
----- Original Message -----
From: <MMccaf8697@aol.com>
To: <datsun-roadsters-digest@autox.team.net>
Sent: Saturday, December 18, 1999 7:32 PM
Subject: Re: exhaust gases inside with top up.
> I am a relatively new roadster enthusiast, however, I've spoken z cars for
a
> long time.
> On my roadster, exhaust gases seem to be entering the cockpit the the top
up.
> I've taken the car to various exhaust system shops for diagnosis, and at
> present, no leaks are found. I've noticed a lot of dust accumulation on
the
> rear wheel wheels and side panels, partially because we drive to and from
our
> home on a very dusty road.
> The weatherstripping a the trunk lid is in good condition. Also, some
rubber
> plugs are missing at the drain holes in the lower part of the trunk behind
> each rear wheel. Is the roadster susceptable to a vacuum effect similar to
> the z-cars in which exhaust gases can be "sucked" in from the rear? I
need
> to take care of this soon. Ostensibly, I've been preparing the car for my
> finance to enjoy, but at this point we both reek of exhaust in our clothes
> and even I can't fully enjoy the car.
> Side note/another thought: the car is an early 67 transplanted with the
U-20
> and 5-speed, however, I haven't noticed if there is a crankase ventilation
> system like the later L series motors. Any thoughts?
> Mark McCafferty
>
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