Temperature Indicator Part 68-10883 / Installation / Bulb Seals

[Jacques1960]

I’ve just acquired a NOS indicator assembly which appears complete (and hopefully correct for a ‘36 Phaeton).

The reservoir bulb has a flange which needs, on its lower side, to seal to the face of the water pump receiving port and, on its upper face, to the underside of the sealing nut / bushing.

Should any sealant be added to either surface of the bulb flange, or is it just a crush seal ?

System is not pressurized.

Thank you.

[Brian]

Improperly fitted these things can be impossible to remove without wrecking them. People tighten them up too tight squeezing the sealing faces together, and sometime later, in attempting to remove the probe from the housing, will snap off the capillary tube. The way I fit mine is to generously coat the probe and nut [all the bits that go into the housing] with nickel based anti-seize compound, and when inserted, just 'nip' up the nut. The seat on top of the bulb will seal on the mating seat machined into the housing. Fill the radiator with coolant and observe for leaks. If it weeps any, just tighten a smidge more. This way, sometime down the track, you'll have no trouble removing it.

[Jacques1960]

Just the advice I needed, particularly with respect to the nickle anti-seize; I can only imagine aluminum or copper accelerating the electrolytic process.

As you indicate, mine was damaged during the removal process as nut and bulb had fused to the pump housing due to corrosion.

Separately, I’ve seen some with a short section of rubber hose used as a stress reducer where capillary tube assembly enters the nut. Your thoughts ?

Thank you.

[Brian]

Dunno about rubber hose; I've never used it. The main thing is to nip up the nut only sufficiently to stop any weepage. More is not better!!

[Jacques1960]

Copy that !

[Jacques1960]

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Brian, PM’d you with a couple of additional questions. Thank you !