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Old 07-20-2020, 12:29 PM   #1
fred.malmberg
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Default oil pressure sensor leak

On my 81, B21A with SU carbs

I just finished changing my three front seals, I also changed the front crankshaft cover gasket because it looked like it was leaking. At the same time changed my timing belt and water pump, etc . got it all re-assembled, and was stoked because I didn't mess up the timing and it started and idled perfect - and no leaks from seals or water pump.

But my oil pressure sensor (near oil filter) started leaking steady drip 1x per second. It is odd because i'm fairly sure it wasn't leaking before, certainly not at this rate.

Before next weekend when I have time to looked at again, any thoughts on any related issues that might be causing the oil pressure sensor to start leaking?
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Old 07-20-2020, 12:39 PM   #2
Mr. V
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Either coincidence or higher than normal oil pressure.

Is the PCV system clean and free of any obstruction that would impede the movement of oil through it?

If so, that can be a cause of higher than normal oil pressure.
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Old 07-20-2020, 01:23 PM   #3
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'81 242 B21F
Possibly it only leaks when the engine is cold so the oil pressure is higher. My sensor has an 1/8" pipe thread fitting. It's a tapered thread so you could try tightening it a little or remove the sensor and put some teflon tape on the threads.
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Old 07-20-2020, 01:28 PM   #4
hiperfauto
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It's probably an old sensor and the diaphragm has ruptured. Remember Murpy's law, "If anything can go wrong, it will".

Don't use teflon tape on a sensor that's needs a ground. Use liquid teflon thread sealer instead.
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Old 07-20-2020, 01:34 PM   #5
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Opportunity to add an oil pressure gauge.
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Old 07-20-2020, 03:13 PM   #6
fred.malmberg
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Quote:
Originally Posted by Mr. V View Post
Either coincidence or higher than normal oil pressure.

Is the PCV system clean and free of any obstruction that would impede the movement of oil through it?

If so, that can be a cause of higher than normal oil pressure.
Yes I need to clean crankcase ventilation .. will do that.
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Old 07-20-2020, 03:14 PM   #7
fred.malmberg
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Quote:
Originally Posted by hiperfauto View Post
It's probably an old sensor and the diaphragm has ruptured. Remember Murpy's law, "If anything can go wrong, it will".

Don't use teflon tape on a sensor that's needs a ground. Use liquid teflon thread sealer instead.
thanks for tip on liquid teflon vs tape
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Old 07-20-2020, 03:30 PM   #8
fred.malmberg
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Originally Posted by johfraser View Post
Opportunity to add an oil pressure gauge.
Maybe a good idea, . I do have a surplus oil pressure gauge that I picked up a couple years ago (actually it's the 3 gauge cluster with oil pressure, voltage, ambient temp).

Where do I find a oil pressure sensor with both the switch for the warning light, and transmitter for the gauge?
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Old 07-20-2020, 04:02 PM   #9
Khrrck
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Do you have the 3 bar or 5 bar oil pressure gauge?

The sender for the 5 bar gauge is VDO 360-009, still available new.

The 3 bar gauge I don't know the VDO part # for... Volvo # is 1308298 but not sure anyone sells them.
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Old 07-20-2020, 05:00 PM   #10
fred.malmberg
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Quote:
Originally Posted by Khrrck View Post
Do you have the 3 bar or 5 bar oil pressure gauge?

The sender for the 5 bar gauge is VDO 360-009, still available new.

The 3 bar gauge I don't know the VDO part # for... Volvo # is 1308298 but not sure anyone sells them.
thanks for info, I have the 3 bar gauge
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Old 07-20-2020, 09:04 PM   #11
fred.malmberg
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Quote:
Originally Posted by Khrrck View Post
Do you have the 3 bar or 5 bar oil pressure gauge?

The sender for the 5 bar gauge is VDO 360-009, still available new.

The 3 bar gauge I don't know the VDO part # for... Volvo # is 1308298 but not sure anyone sells them.
OK I searched through my boxes of stuff, . found the sender for the guage




It looks damaged though .. maybe someone tried to open it?

How do you open it? I just want to clean it up .. or you can't open it?
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Old 07-20-2020, 10:46 PM   #12
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You can't open it: at least I couldn't figure out how to safely open mine.

I had a leak where it threads into the block: teflon tape didn't solve the problem, so to seal it I used Loctite thread sealant and let it harden for a couple days before firing it up: worked great.
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Old 07-20-2020, 11:21 PM   #13
Harry Tuttle
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Quote:
Originally Posted by Mr. V View Post

Is the PCV system clean and free of any obstruction that would impede the movement of oil through it?

If so, that can be a cause of higher than normal oil pressure.
Sorry, that is incorrect.

As far as why the sender would start leaking after that work: it is an old car. Things will fail at any time.
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