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76 Bus TS II Question
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cellobus1
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PostPosted: Sun Jun 17, 2018 9:08 am    Post subject: 76 Bus TS II Question Reply with quote

Hi. I have stock FI on my 2 liter motor. I want to replace the TS II because the wire is pretty chewed up, with not many strands still connected. I'm also finding oil in the cup-like seal for the sensor. I have a spare used sensor, but its washer is kind of deformed. I'm wondering if the washer can be removed and replaced with something? Picture below, although its hard to capture the deformities. I'm pretty sure this won't fly as is.

Thanks,
Andy


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Image may have been reduced in size. Click image to view fullscreen.

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SGKent Premium Member
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PostPosted: Sun Jun 17, 2018 9:20 am    Post subject: Re: 76 Bus TS II Question Reply with quote

how do you know that the used one is good? have you tested the resistance?
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furgo
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PostPosted: Sun Jun 17, 2018 10:05 am    Post subject: Re: 76 Bus TS II Question Reply with quote

What you see there is a crush washer/gasket.

I'm guess VW/Bosch put it there in order for the steel body of the sensor's bolt not to damage the aluminum heads while torquing the sensor. Other than that, I'd say it's not a critical piece of the function of the sensor and it's not critical either if it's not completely flat. Unlike other crush washer applications, it doesn't have to form a fluid-proof seal.

That said, the crucial part is that the sensor has a good ground connection to the engine case. The crush washer helps, but that is mostly achieved through the sensor threads having good contact with the threaded hole in the cylinder head. But while you're in there, you might as well replace it and install the sensor in the best way you can.

My original TS2 had a copper washer (more conductive), whereas the new Bosch TS2 I replaced it with had an aluminum copper washer (softer). So I'm thinking either material should do.

To answer your question, I guess you can use regular solid aluminum or copper washers for metric M10 screws. Perhaps one of these?

https://www.belmetric.com/solid-copper-gaskets-c-11_91/gsc10x12-solid-copper-gasket-p-6135.html
https://www.belmetric.com/aluminum-gaskets-c-11_92/ga10x14-aluminum-gasket-p-534.html

But yes, I guess it goes without saying that you should test the function of the used sensor before installing it Smile
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Tcash
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PostPosted: Sun Jun 17, 2018 12:45 pm    Post subject: Re: 76 Bus TS II Question Reply with quote

As posted you can make due without the washer.
The oil you are seeing should not be coming from that hole, because that hole is blind and goes no where.

Happy Father's Day
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busdaddy
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PostPosted: Sun Jun 17, 2018 12:49 pm    Post subject: Re: 76 Bus TS II Question Reply with quote

Tcash wrote:
The oil you are seeing should not be coming from that hole, because that hole is blind and goes no where.

Now in all fairness he never specified what hole he found that in, some PO's are rather creative.
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cellobus1
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PostPosted: Sun Jun 17, 2018 2:45 pm    Post subject: Re: 76 Bus TS II Question Reply with quote

Yeah whoa, there, Nellie!! I realize that I am confusing two components, the TS II and the oil pressure sending unit. The "newer" TS II has been installed, and seems to work. It better, because in removing the old one (which didn't have a washer), the wire snapped off. I took off the washer, it was all copper and no match for needle-nose.

Now then. The oil pressure sender is the thing with the cup seal that's filling with oil. Can this sender conceivably leak internally? I have another one laying around somewhere.
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furgo
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PostPosted: Sun Jun 17, 2018 3:08 pm    Post subject: Re: 76 Bus TS II Question Reply with quote

Glad it worked. To be clear though, I wasn't advocating for removing the washer altogether. If it weren't going to be replaced, I think leaving the soft washer in would have been nicer to the cylinder head.

As per the oil switch leak, others with more experience will probably add their comments.
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busdaddy
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PostPosted: Sun Jun 17, 2018 3:11 pm    Post subject: Re: 76 Bus TS II Question Reply with quote

cellobus1 wrote:
The oil pressure sender is the thing with the cup seal that's filling with oil. Can this sender conceivably leak internally? .

Yes, it's not uncommon for them to leak after 40+ years.
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Tcash
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PostPosted: Sun Jun 17, 2018 6:48 pm    Post subject: Re: 76 Bus TS II Question Reply with quote

busdaddy wrote:
Tcash wrote:
The oil you are seeing should not be coming from that hole, because that hole is blind and goes no where.

Now in all fairness he never specified what hole he found that in, some PO's are rather creative.

This is so true!

It all makes sense now.

Change oil pressure switch
Oil Pressure Switch Air Cooled VW ID

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cellobus1
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PostPosted: Sun Jun 17, 2018 7:13 pm    Post subject: Re: 76 Bus TS II Question Reply with quote

Thanks, y'all. Happy Father's Day! I spent mine in the driveway screwing things in.

Great link.
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Tcash
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PostPosted: Sun Jun 17, 2018 7:27 pm    Post subject: Re: 76 Bus TS II Question Reply with quote

cellobus1 wrote:
Thanks, y'all. Happy Father's Day! I spent mine in the driveway screwing things in.

Great link.


Better screwing things in, than screwing thing up.
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scrivyscriv Premium Member
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PostPosted: Sun Jun 17, 2018 7:52 pm    Post subject: Re: 76 Bus TS II Question Reply with quote

cellobus1 wrote:
...finding oil in the cup-like seal for the [oil pressure] sensor...

Oil pressure switches will leak in two places.. around the threaded area, and from the plastic side where the wire plugs in, at the swage.
Leaks at the threaded area can be a cracked case, stretched threads in the case, or just not torqued. If i understand it right, the metric threads on a stock oil pressure switch do not seal like a U.S. pipe thread does. You would need a crush gasket if you're installing a replacement switch with a metric size. If you replace it with a 1/8" NPT threaded sender, the pipe threads will seal against the case without needing a crush gasket.
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