Author Topic: Need help sourcing manual trans 3rd & 4th gear switches  (Read 159 times)

roymil

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Need help sourcing manual trans 3rd & 4th gear switches
« on: August 17, 2022, 21:56:44 »
Hello,
I'm having trouble sourcing the 2 switches that live on top of the manual 4-speed trans and are part of the FIP fuel cutoff solenoid circuit.  One of mine is stuck closed and I plan to just replace both but haven't found any at my usual sources.   Hoping somebody knows where they can be found, or alternatives that are mechanically compatible.   I'm reposting a picture from another post that TylerS took a few years ago.  Appreciate any leads.    thanks!  Mark
Mark Miller
1968 280SL
Rode in his pagoda's first mile.

Todd

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Re: Need help sourcing manual trans 3rd & 4th gear switches
« Reply #1 on: August 18, 2022, 00:35:59 »
While searching, maybe you can free the stuck one up, with applications of Kroil and maybe some heat from a hair blow dryer?
Todd

roymil

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Re: Need help sourcing manual trans 3rd & 4th gear switches
« Reply #2 on: August 18, 2022, 03:16:53 »
great idea.  I didn't even think to try and spray it off in-situ.   I do have access from the top since my carpet is out so I'll try that first.  I'm not familiar with Kroil but I do have some WD-40 contact cleaner that is supposed to be good for electrical components and not leave residue.   

Still a mystery why Ive never seen those switches for sale at this late stage of my pagoda's resurrection.  I thought I had seen every part somewhere or another at one of the 6 or 7 different parts suppliers I've used.  I'm not seeing those switches at all on diagrams at the euro parts houses so might be these only existed on US models.
Mark Miller
1968 280SL
Rode in his pagoda's first mile.

Todd

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Re: Need help sourcing manual trans 3rd & 4th gear switches
« Reply #3 on: August 18, 2022, 04:26:40 »
I wish I could be of real help on locating the switches.  My '66 W111 coupe doesn't have them.

Kroil is a highly ranked penetrant.  You'll find it at places like NAPA, and maybe your local hardware store.  PB Blaster is another good quality penetrant.  WD-40 is typically very poorly ranked, as it was never designed to be a lubricant, or a penetrant.  WD stands for water dispersant, formula attempt, number 40.  It was designed to be sprayed on the wet electrical components in the military.  It's also a pretty good hand cleaner. 

If you have enough access to remove the switch(es) from the horizontal position, and stand them upright, that'll help the Kroil creep down in.  If you can wiggle the pin side-to-side, that will also help the capillary action and get the Kroil to seep in.  You may find if you let it sit for a day or 2, keep wiggling the pin, and applying small amounts of penetrant, it will free up.  Acetone mixed 50/50 with ATF also makes an outstanding penetrant.  Heat from a hair dryer can often help when a pin is stuck inside a switch, due to the varnish residue left behind when original lubricants or grease age and fail.

Last, or maybe "another" option, is to see if you can get the switch apart, even if you had to JBWeld epoxy it back closed.  If I saw a much better photo of the switch, maybe I could help with figuring out how to safely get it apart.  I've never seen one.

Do the diagrams on the niemoeller.de website show anything?
Todd