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-   Porsche 911 Technical Forum (http://forums.pelicanparts.com/porsche-911-technical-forum/)
-   -   Severe overheating issue - running out of ideas (http://forums.pelicanparts.com/porsche-911-technical-forum/760204-severe-overheating-issue-running-out-ideas.html)

roblav 07-10-2013 12:47 PM
Agree with thermostat, oil cooler blockage, or mouse house first!

vash 07-10-2013 01:00 PM
dog. your IR thermometer is good?

seems like you checked everything. including the mouse nest everyone keeps bringing up.

you have confirmed your thermometer is good?

bobolsn 07-10-2013 01:31 PM
Dog,

Sounds like you have checked everything. A problem I have experienced in fuel delivery and radiators is a vapor lock. Are the return oil lines positioned with a low/high point where a vapor pocket can not easily be displaced/flushed?

Good luck

gogo22 07-10-2013 02:37 PM
I had exactly the same symptoms! Issue with my SC was actually the oil pressure security valve, which was "open" all the time (should only open > 6bar). So - no normal oil flow could be established. These motors are not air-cooled, they are oil cooled.

I think there is also a temp valve (not the one controlling the 2nd circuit), which could probably fail.

Good luck!

Ronnie's.930 07-10-2013 02:50 PM
Quote:
Originally Posted by gogo22 (Post 7541314)
I had exactly the same symptoms! Issue with my SC was actually the oil pressure security valve, which was "open" all the time (should only open > 6bar). So - no normal oil flow could be established. These motors are not air-cooled, they are oil cooled.
I think there is also a temp valve (not the one controlling the 2nd circuit), which could probably fail.

Good luck!
The highlighted statement above is false.

quattrorunner 07-10-2013 02:51 PM
Quote:
Originally Posted by gogo22 (Post 7541314)
I had exactly the same symptoms! Issue with my SC was actually the oil pressure security valve, which was "open" all the time (should only open > 6bar). So - no normal oil flow could be established. These motors are not air-cooled, they are oil cooled.

I think there is also a temp valve (not the one controlling the 2nd circuit), which could probably fail.

Good luck!
??????

Bob Kontak 07-10-2013 03:36 PM
Quote:
Originally Posted by manbridge 74 (Post 7541108)
Can you turn fan easily by hand with engine off?
Yep. +1


Check the video out 36 seconds in. Are you sure there is nothing on top of the oil cooler that you may not have seen by only removing the plates to the left and right of the center fan?

http://forums.pelicanparts.com/porsche-911-technical-forum/760014-has-everyone-seen-3-2-teardown.html

Lapkritis 07-10-2013 07:00 PM
Should be able to see the top of the oil cooler by removing #6 cyl plug wire.

boyt911sc 07-10-2013 08:18 PM
How did you do it???????
 
Quote:
Originally Posted by Dogbreath (Post 7540947)
Thank you for all your excellent suggestions. I tried a few more things this afternoon.

Pulled the plugs...they look fine not overly dry and white and not overly black and oily.

Tested the temperature going into the oil cooler and coming out with a laser thermometer...great suggestion by the way. It appears that the temperature coming out is quite a bit cooler than going in.

I also took off a WUR that was on a turbo and put my non-working one back on just to see if that made any difference. It didn't within 5-6 minutes of running that car the oil temp was over 210.

To answer a few for the questions asked...

I have the 11 blade fan.
I have a tested and confirmed working thermostat.
I have confirm proper orientation of the sump plate.
I have checked the oil pump pickup and it looked fine.
The are no thermal reactors
CIS appears to be working fine.

I can only image that there may be some blockage somewhere in the engine. It gets so hot so quickly I can't imagine what else it could be.

Thanks again
How did you test and confirm that the auxiliary thermostat is opening at 186°F? Not the engine thermostat but the thermostat by the right rear fender well.

Tony

Ronnie's.930 07-10-2013 08:39 PM
Quote:
Originally Posted by boyt911sc (Post 7541906)
How did you test and confirm that the auxiliary thermostat is opening at 186°F? Not the engine thermostat but the thermostat by the right rear fender well.

Tony
In the first post, the OP said his car did not have an external oil cooler (just the engine mounted one) . . .

Reiver 07-10-2013 08:57 PM
Is the oil cooler 'clean'...if someone has overfilled the oil it can leak down and saturate the filter then allow for lots of dirt to become embedded in the fins. Just a thought.
You can get a good look from below it it's on a rack...unless you have SSI's that is.

boyt911sc 07-10-2013 09:03 PM
Do you know......
 
Quote:
Originally Posted by Ronnie's.930 (Post 7541944)
In the first post, the OP said his car did not have an external oil cooler (just the engine mounted one) . . .
Ronnie,

Do you know that a '77S (911) has two (2) thermostats even with a trombone cooler? We are talking about thermostats and not auxiliary or external cooler!!!

Tony

Chuck Moreland 07-10-2013 09:16 PM
Confirm that the oil temp sending unit is the correct match the dash gauge. There are two different sending unit/gauge combos 65-76, and 77-89.

Mismatch the pair and you have incorrect readings.

You most surely have the 77 dash gauge. But your engine was replaced with a 74, and unless the sending unit was swapped to the later part - you are getting bogus readings.

The correct sending unit for a 77 is 911 606 112 00

Ronnie's.930 07-10-2013 09:29 PM
Quote:
Originally Posted by boyt911sc (Post 7541982)
Ronnie,

Do you know that a '77S (911) has two (2) thermostats even with a trombone cooler? We are talking about thermostats and not auxiliary or external cooler!!!

Tony
Tony, in his first post, the OP says that the car has only the engine oil cooler (no front cooler), so you are saying that he is mistaken? Yes, I know that 911s have an auxiliary thermostat if they have an auxiliary oil cooler (even the trombone).

Jdub 07-10-2013 10:38 PM
What Chuck said. I have studied this post and have not heard you rate a 250 on your physical exterior temp checks. I only know this match requirement after changing both gauge and sensor in my '78 from useless bands to actual temps.

tevake 07-11-2013 01:14 AM
But if he is confirming the high temps with a hand held device that confirms the temps , then there is clearly a problem.
Good suggestion brought up so far, and you do seem to be going through this in a systematic through way. Will be a learning experience for us all when the culprit comes to light. Hang in there, and be careful not to do damage in the mean time.

Cheers Richard

T77911S 07-11-2013 03:09 AM
do you have enough oil in it? dumb question, but you never know. it does not need to be full, although low could make it run hot, not sure if it would get hot as fast as you say.
it just sounds like oil is not getting to the cooler or air is not going thru it for what eevr reason.

unclebilly 07-11-2013 03:42 AM
I agree with the above post on checking your sending unit and making sure it matches your gauge.

2 other things to consider:

1. Pull a few spark plugs. Are they white? If so, you are running too lean and need to tweak your mixture.

2. In my 911 chump car, I had similar problems until I noticed that the plate in the gauge with the numbers on it was loose and so what was really 210 was actually reading 235 or more. It took looking at he temp under hard cornering to notice the gauge moving, not he needle.

kodioneill 07-11-2013 06:20 AM
IR thermometers are tricky they have issues reading correct temps when pointed at shiny surfaces like metal oil lines the readings will not be accurate. I would use a thermocouple device to back up your readings.

Joe Bob 07-11-2013 06:49 AM
Where is the OP located?

I agree that the temps and AFR need to be verified. Willing to help if he is in So CA.


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