Oil pressure and temp issues

356 Porsche-related discussions and questions.
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Norm Miller
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Re: Oil pressure and temp issues

#31 Post by Norm Miller » Sat Aug 03, 2019 7:17 pm

In your photo it appears the knurled nut on the sender is touching the sheet metal over #4 cylinder.
If it's grounded it won't work.
 

Brad Ripley
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Re: Oil pressure and temp issues

#32 Post by Brad Ripley » Mon Aug 05, 2019 12:03 pm

Greg, the sender in your photos of July 11th according to the markings were of a sender which must be used with a re-calibrated gauge. If your gauge has been rebuilt and therefore recalibrated, then the sender with a threaded stud (shown in your last photo) is the wrong one.

Greg Spreeman
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Re: Oil pressure and temp issues

#33 Post by Greg Spreeman » Thu Aug 08, 2019 7:15 pm

Hey Guys,

Sorry for the recent silence. My mother-in-law passed away in March which rocked the family. Now, just last week, her husband, my father-in-law passed away. I guess to complete the old saying of, "things come in threes...", my mother passed away the first week of December. Not a good year. In any case, getting back to the car issue, North Hollywood rebuilt the temp gauge so I called them and they sent me a new temp sender. I also purchased a decade box and, with the instructions in a post above, I'll try to see what she is doing. I guess after the decade box to measure resistance and a multimeter to measure what his happening at the sensor, I'll have a better idea of what is happening. BTW, the Porsche 996 ran a bit warm today so, when I got home, popped open the rear deck and saw that the coolant level was low. Poured in some more antifreeze and noticed it ran right on to the garage floor. Hoping it's just the reservoir.

"And the hits just keep coming"

Best, Greg
Greg Spreeman
1965 356SC Coupe
1964 356C Sunroof Coupe

Greg Spreeman
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Re: Oil pressure and temp issues

#34 Post by Greg Spreeman » Fri Aug 09, 2019 12:23 pm

Here is what I got with the decade box:
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Greg Spreeman
1965 356SC Coupe
1964 356C Sunroof Coupe

Greg Spreeman
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Location: South Orange NJ

Re: Oil pressure and temp issues

#35 Post by Greg Spreeman » Fri Aug 09, 2019 12:24 pm

Here is another setting and the result
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Greg Spreeman
1965 356SC Coupe
1964 356C Sunroof Coupe

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Wes Bender
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Re: Oil pressure and temp issues

#36 Post by Wes Bender » Sun Aug 11, 2019 11:15 am

I hesitate to muddy the waters, but I've got to ask the question. When you run the engine and get it up to normal temperature, is the oil filter canister getting hot to the touch? If it isn't, something is blocking either the restrictor hole in the junction block or the one in the filter housing standpipe. If either of these is blocked, your oil temperature sensor will only see ambient temperature and will read lower than it should.
Some days it just isn’t worth the hassle of chewing through the restraints......

Greg Spreeman
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Re: Oil pressure and temp issues

#37 Post by Greg Spreeman » Sun Aug 11, 2019 8:36 pm

I am bypassing the canister and have the full flow system. I accidentally left the temp sensor out and started up the car a few days ago and ended up lubricating my entire engine bay. So, I am definitely seeing oil running through the system.
Greg Spreeman
1965 356SC Coupe
1964 356C Sunroof Coupe

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Bill Tate
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Re: Oil pressure and temp issues

#38 Post by Bill Tate » Sun Aug 11, 2019 9:54 pm

Greg, If you have blocked flow through the bypass filter you will have pressure at the temp sensor but no flow. The temp would be via conduction rather than by the flow of hot oil over the sender. You need flow to reflect temp of oil exiting the oil pump. Can you open flow to the bypass filter and recheck temp reading? KTF
Bill Tate
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Wes Bender
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Re: Oil pressure and temp issues

#39 Post by Wes Bender » Mon Aug 12, 2019 10:36 am

If you have eliminated the oil line that used to go from the junction block to the filter (and the second line from the filter to the case), I think we've found the problem. As Bill indicates and as I was alluding to above, you have to have a path from the junction block back to the case. The restrictor in the junction block will prevent excessive bleed-off of pressure. You need that flow across the sensor or your readings will be too low. Not just pressure at the junction block, but flow past the sensor. Do you have that flow?
Some days it just isn’t worth the hassle of chewing through the restraints......

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