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What size thread on the oil pressure switch?

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karmannghia60 Karmann Ghia Sucker

1,459 posts · joined Aug 2002 ·

#883939
Just need to know what is the thread size for the oil pressure switch on a T1 engine
Thanks

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 ·

#883941
karmannghia60 wrote:Just need to know what is the thread size for the oil pressure switch on a T1 engine
Thanks
from memory its 1/8th tapered pipe thread [ 1/8"inch TPT]

that is why You use teflon tape or pipe sealant on the thread
and only do it up till it doesn't leak...

keep screwing in and the block will crack.. YIKES

You can buy fittings to screw into it... its a common thread..

LEE
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#883942
10 x 1mm

WTF would 1/8 be doing on a VW?
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 ·

#883944
it was before the war Mat..

it is tapered though??

Isn't it... senders look tapered

the extension I have is 10mm x1 mm... [now remember]

LEE
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#883947
68AutoBug wrote:it was before the war Mat..

it is tapered though??



LEE
mmmm, don't think VW was imperial pre WW2 🤪🤪
The senders are a tapered 10 x 1, but I'm not so sure the case is tapered.
1/8 BSP is very close but will damage the thread in the case if used.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

HappyDaze Superannuated

2,887 posts · joined Jun 2009 ·

#883997
Definitely M10x1.0, as Matt says. DON'T use 1/8 gas [BSP], unless you have a spare crank-case.
I'd rather wear a Beetle out by racing it than by polishing it!

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 ·

#884000
Ugh how many times have I seen that....

People go down to autobahn, grab an oil pressure gauge, screw the sender in........craaaaack 😂

amazeer Bishop of Volkswagenism

3,029 posts · joined Nov 2005 ·

#884776
and threads are tapered so you DONT use tape.

beetleboyjeff Custom Title Time!

1,790 posts · joined Feb 2009 ·

#884800
amazeer wrote:and threads are tapered so you DONT use tape.
That is what I have been told as well. They reckon it is too easy to crack the case if you put tape on it, and as you said, because it is tapered, it is not needed.
From your ole' mate Jeff

lou0060 Wolfsburg Wizard

568 posts · joined Dec 2010 ·

#885037
agree thread type should be M10x1.0 pitch but even if it is tapered it won't guarantee it wont leak. Thread tape is not the best option but I would definitely use a good thread sealant such as Permatex or Loctite. Remember that the oil is hot and under pressure so it will weep through threads even if they are tapered. The only way to eliminate leaks is to use a good quality thread sealant.
1971 karmann ghia Cabrio - Cruising 👍
1963 beetle Sunroof - gathering dust 🥲
1968 race beetle - twin turbo Subaru - stress relief 😁
1960 beetle - old school low & slow 😏

HappyDaze Superannuated

2,887 posts · joined Jun 2009 ·

#885039
Loctite make really good teflon thread sealant, that is resistant to nearly everything. Don't use retainers though.
I'd rather wear a Beetle out by racing it than by polishing it!

zjm Officially Full-On Dubber

230 posts · joined Jan 2003 ·

#892788
I tape mine but then again my cars dont leak oil so maybe I'm doing it wrong I also cover my push rod tube orings in aviation cement it doesnt seem to matter if theyre German ,mexican ,brazilian or whatever they still dont leak great stuff