280sl cylinder head hole what is missing?

[Autobob]

Attached photo at red arrow, we have a threaded hole but do not know what goes there please advise, it is next to cylinder #6.

Arrgg, It would have been so much simpler if this car had been assembled when it arrived. So many missing parts...

Thank you, Bob

[kampala]

I think that is the port for a Thermo Time Switch if your car is a late 280sl.  Earlier cars had this switch on a pod closer to spark plugs 2 & 3.  Later cars have this switch next to spark plug 6.  Sometimes, this port is used for a cooling by-pass modification and in such cases the TTS is moved into the bypass line. 

[Autobob]

Thank you that helped, yes this is late model 1971, I found it in technical forum part 001 545 92 24. Looks like NLA from Benz, Joe or Alfred would you have one of these?

[Benz Dr.]

Thermo time switch? That should be readily available.

[Autobob]

OK then part number in technical may be superseded, will check that out. Thanks, Bob

[66andBlue]

Thank you that helped, yes this is late model 1971, I found it in technical forum part 001 545 92 24. Looks like NLA from Benz, Joe or Alfred would you have one of these?

Sorry, don't have one.

[Autobob]

@Benz DR, just heard back from MB dealer, TTS discontinued and no superseded number.  Rats.

[Tyler S]

Here is one at Auth Classics. Very Pricey
http://www.authenticclassics.com/Mercedes-Thermo-Time-Switch-fits-230SL-250SL-p/auth-004360.htm

Or you can use this one with a slight harness modification. The rubber boot will hide the connection.
http://www.authenticclassics.com/Mercedes-Thermo-Time-Switch-230SL-250SL-280SL-p/auth-006760.htm

[ja17]

Wow, crazy prices on these!

[Tyler S]

Another disappearing part that will go way up in price just like the fuel pumps last year.

[WRe]

Hi,
here you find some info: www.sl113.org/wiki/Engine/ThermoTimeSwitch.
...WRe