[T3] Tight exhaust valves

[Jacob Adam Schroeder]

Keith,

Great question.  I am not measuring my head temps with any sensor, if that
is what you mean.  I'm running a stock setup.  Is it advised to measure the
head temp nowadays and is this an easy install?  If so, maybe I'll post a
new thread down the line for help in that regards.

I could tell my car was running hotter for two primary reasons: (1) the
heat in my car was very good during this time (forcing me to dial down the
heat and/or open the windows) and (2) after a drive I could tell more fuel
was being evaporated from my fuel line than normal--meaning extra cranks to
start and/or extra time on the fuel pump button (Jim's kit) to pump out the
air.

I rebuilt this engine back in 1997 and at that time used heads from
MoFoCo.  They are not the correct heads for my year (no crankcase vent) but
they do have the FI sensor port. I have a set of proper Type 3 heads for my
year (with the vents) that I'd like to get refurbished for future use.

As far as the tight exhaust valves, the searching of forums makes me think
either (a) my valve seats are sinking into my head or (b) my valves are
stretching.  Neither one of these sounds very good and I'm hoping there
could be a more benign cause or that either (a) or (b) (to a small extent)
is not necessarily catastrophic or simply part of engine break-in  (I maybe
have 10,000 miles on this since the last rebuild).

Jacob


On Thu, Dec 26, 2013 at 7:49 AM, Keith Park <topnotch at nycap.rr.com> wrote:

> What do you mean by "noticeably hotter"?  how are you measuring your head
> temps?  Usually tight exhaust valves are a result of cheap aftermarket
> heads
> but running too hot can certainly do it, but REALLY hot, not something your
> likely to see in the winter time here.
>
> Keith
>
>
> Top Notch Restorations
> topnotch at nycap.rr.com
> http://www.a383ina68.addr.com/radiorest/main.htm
> 71 Squareback "Hothe"
> 65 Notchback "El Baja Rojo"
> 65 Squareback "Eggcrate"
> 87 golf "Winterat"
> 93 RX7 "Redstur"
>
>
> -----Original Message-----
> From: type3-vwtype3.org-bounces at lists.vwtype3.org
> [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Jacob
> Adam
> Schroeder
> Sent: Thursday, December 26, 2013 10:43 AM
> To: type3 at vwtype3.org
> Subject: [T3] Tight exhaust valves
>
> My car ('72 FI Squareback) had been running noticeably hotter lately and
> started leaking a little oil from the valve cover gaskets (probably due to
> excessive heat), so I decided to check my valves while I was replacing the
> valve cover gasket.  It had been ~ 1500 miles since the last time I
> checked/adjusted my valves.  Each of my intake valves was still .006, but
> each of the exhaust valves (on all 4) were tight.  Tight as in practically
> no clearance.
>
> The fact that there was no clearance on any of my exhaust valves was a bit
> concerning to me.  I was able to adjust them all to get .006 again, but I'm
> still a bit spooked out.  What could have caused these to get so out of
> whack in such a short time and does this indicate a more severe problem?
>
> Is there anything else I can do to further diagnose this issue or should I
> just keep driving it and see what happens?
>
> Thanks,
>
> Jacob
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