[urq] Manifold O2 sensor thread stripped

Fri Aug 16 02:48:03 PDT 2013

Best chance imho is to take it to a machine shop and have it repaired .
The way I fix those is by machining a kind of bung and weld it in .
The old one has to be cut out on the mill , or fi with fi a hole saw and 
then the new one can be welded in .
End tapping should be done after the bung is welded in .

The sensor thread is M18*150 btw .

Altough I'de advise against it , a decent machine shop should  also be able 
to weld a pass on
the worn thread , and then drill it to size and re tap it .
Done it a couple of  times like thgis , but it causes problems the next time 
you have take the sensor out .

Pat

----- Original Message ----- 
From: "Lino M. Valadas" <lvaladas at sympatico.ca>
To: <urq at audifans.com>
Sent: Friday, August 16, 2013 3:45 AM
Subject: [urq] Manifold O2 sensor thread stripped

> Gentlemen,
>
> The threads on the O2 sensor hole are completely gone on my 1983 Ur-q 
> manifold.  I need some advice on the best way to correct the situation:
>
> 1) Tap new threads and screw in a helicoil
> 2) Weld in an O2 bung
>
> The first option might be tricky due to the tight quarters.  Has anyone 
> ever done it?
> The 2nd option, also tight to weld in there, but also concerned with the 
> O2 tip not being close enough to the exhaust flow.
>
> Any advice would be welcome.  I would prefer no to have to replace the 
> manifold.  The one in there isn't the original, it is a two piece 
> replacement and I would like to keep it.
>
> Thanks a lot
>
> Lino
> 83 Ur-q  (900500)
>
>
> -----Original Message----- 
> From: Brandon Rogers
> Sent: Thursday, August 15, 2013 3:39 PM
> To: 'Keith' ; urq at audifans.com
> Subject: Re: [urq] general overheating question
>
> A few months ago my '01 S4 gauge would show the engine as overheating 
> however oil temp was normal, fans operating as normal etc.
>
> It was a dead water temp sensor - which on the V6TT is on the back of the 
> motor - so-so access - prolly similar location but better access for the 
> 1.8T.
> It's a cheap sensor - replacement was a pain as it uses these, ahem, funky 
> (insert foul language here) plastic clips.  Apparently the trick is put 
> them in boiling water for a few minutes first to give them some 
> flexibility.  I'd buy 5 tho, JIC.
>
> Hope it something simple-
>
> Brandon
> '01 S4
> '91 911 Turbo
> '84 urq 20VT gone but not forgotten
>
>
>
> -----Original Message-----
> From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf 
> Of Keith
> Sent: Thursday, August 15, 2013 11:20 AM
> To: urq at audifans.com
> Subject: [urq] general overheating question
>
> Evening All
>
> Apologies for this being a bit off (urq) topic but I could really do with 
> a bit of general diagnostic help with an overheating issue on our Audi A6 
> 1.8t (2001).
> The symptoms are:
> Sudden overheating issue.
> No steam
> No bursts
> The coolant level had dropped a little but there were no obvious leaks 
> although there was some coolant on the lip of the coolant reservoir 
> suggesting that this might have blown out past cap through overheating. 
> The low coolant level alarm sounded when this all occurred which drew my 
> attention to the temp gauge. Got towed home to hopefully now fix it.
> The oil seemed to have got hotter than normal too.
> Bought new filler cap to rule this out.
> Then.....
> Starting from cold, it rises very quickly to 90c (normal operating temp), 
> hangs there for a bit and then goes on rising.
> Viscous fan and electric fan both working fine and when they are supposed 
> to.
> Heater just blows cold air even when overheating.
> Whipped plugs out – all normal colour.
> Tops of pistons look normal – no evidence of steam washing.
> No obvious evidence of oil in water or water in oil.
> Engine starts fine and runs as smooth as normal.
> Thermostat is less than 12 months old. Changed when previously car was not 
> getting warm!
>
> My two main suspects are thermostat despite it being almost new and water 
> pump.
> Have I overlooked anything simple and blindingly obvious?
> Before I start taking it all apart though, what can I do to narrow this 
> down to the the definite culprit?
> I really need to fix this by Monday when I have to use it for work (no 
> pressure eh?) so any suggestions of next steps will be greatly appreciated 
> (as always).
> Cheers folks. Will look forward to hearing from you.
>
> Keith
> ‘87 WR
>
>
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