Oil Cooler Wall of Shame |
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Oil Cooler Wall of Shame |
roblav1 |
Jun 26 2020, 01:10 PM
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#1
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
Got the engine running, for about 30 seconds. And the scavenge oil pressure blew out the remote cooler.
Good news is engine runs and 123 ignition works fine. Bad news... now have to track down why the cooler blew. Thermostat is the Improved Racing type. Oil lines alignment is all correct. Will check next for restrictions in the -12 hoses. If no restrictions in oil hoses, I may skip the thermostat altogether. Attached thumbnail(s) |
jd74914 |
Jun 26 2020, 01:17 PM
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#2
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
How high did oil pressure go? Usually tube fin coolers like that are rated to ~200 psig, with 300 psig burst pressure. Seems like a defect...
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roblav1 |
Jun 26 2020, 01:25 PM
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#3
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
No idea of the scavenge oil pressure. Pressure side read about 85 cold.
My take is that not much oil should have gone to the remote cooler given the low oil temp at the thermostat. |
SirAndy |
Jun 26 2020, 01:50 PM
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#4
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Resident German Group: Admin Posts: 41,641 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
No idea of the scavenge oil pressure. Pressure side read about 85 cold. 85 cold sound about right for idle/low rpm. Mine goes to 100+ when reved up cold. (IMG:style_emoticons/default/idea.gif) |
mepstein |
Jun 26 2020, 04:08 PM
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#5
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914-6 GT in waiting Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Paul/prs9146 did his cooler in when he mis aligned the oil filter console onto the oil tank. Not saying that’s what you did but it’s probably worth checking.
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roblav1 |
Jun 26 2020, 04:31 PM
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#6
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
Thanks Mark. That's the first thing I checked after the fried cooler.
At the two connections to the cooler, I lifted one up and oil came out the other... same thing when lifting the opposite one... oil out the other. Leads me to believe that the thermostat ports to and from the cooler are connected. Something smells Denmark wrong with this thermostat. After that, I was easily able to blow out both hoses with compressed air, so I don't suspect a hose kink. |
mb911 |
Jun 26 2020, 04:56 PM
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#7
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
Oh that sucks
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porschetub |
Jun 26 2020, 06:19 PM
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#8
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Advanced Member Group: Members Posts: 4,699 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Paul/prs9146 did his cooler in when he mis aligned the oil cooler console onto the oil tank. Not saying that’s what you did but it’s probably worth checking. I was going to say stuck relief valve in the case but that's not it,must be the thermostat, funny how is was passing cold oil to the cooler ?,that cooler has hydrauliced @ huge pressure almost like the return oil had nowhere to go...just saying. Is this a stand alone or still using the stock engine cooler also ?. Strange one to sort,got me thinking (IMG:style_emoticons/default/idea.gif) . |
mb911 |
Jun 26 2020, 06:21 PM
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#9
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
Oil filter console rotation could be off.. I double and triple check that on my installs?
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stownsen914 |
Jun 26 2020, 06:32 PM
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#10
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
Crap, that sucks. This is a dry sumped engine? Any chance of a blockage after the oil cooler in the scavenge circuit (which would cause pressure to build "upstream" including the cooler)?
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roblav1 |
Jun 26 2020, 07:03 PM
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#11
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
Roger that on the oil filter console. That may be what Mark mentioned. I'll check in the morning. With no blockage in any lines, it's either that or a bad thermostat.
Maybe I got sloppy with that console. Right now, I hope so. Thanks for mentioning. The base 123 ignition without an MSD seemed to work fine. 2.2S switched curve. I'm off 1 tooth on the distributor drive but had enough to get it running. Yes, dry sump in a warmed over Carrera 3.0. GTS seats arrive tomorrow, windshield Wednesday. Still need sun visors and rear license plate lights, then about good to go. |
wndsrfr |
Jun 26 2020, 07:20 PM
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#12
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Senior Member Group: Members Posts: 1,429 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
Thanks Mark. That's the first thing I checked after the fried cooler. At the two connections to the cooler, I lifted one up and oil came out the other... same thing when lifting the opposite one... oil out the other. Leads me to believe that the thermostat ports to and from the cooler are connected. Something smells Denmark wrong with this thermostat. After that, I was easily able to blow out both hoses with compressed air, so I don't suspect a hose kink. My understanding is that when cold the thermostat ports are connected wide open so the oil does pressurize the cooler but doesn't really flow through since it short circuits to the t'stat exit port. When hot the plug moves to isolate the t'stat inlet port from the outlet port forcing the flow to go through the cooler. Methinks that your return is deadheaded, like nowhere for the scavenge oil to go to so huge pressure spike on the whole cooler system.... |
roblav1 |
Jun 26 2020, 07:59 PM
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#13
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
Thanks John. Agree ports should be connected. Alternative tstat setup is to reverse it, per their diagram. Deadhead is highly likely located at the oil filter console. Fingers crossed that it is.
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porschetub |
Jun 27 2020, 12:03 AM
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#14
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Advanced Member Group: Members Posts: 4,699 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Thanks Mark. That's the first thing I checked after the fried cooler. At the two connections to the cooler, I lifted one up and oil came out the other... same thing when lifting the opposite one... oil out the other. Leads me to believe that the thermostat ports to and from the cooler are connected. Something smells Denmark wrong with this thermostat. After that, I was easily able to blow out both hoses with compressed air, so I don't suspect a hose kink. My understanding is that when cold the thermostat ports are connected wide open so the oil does pressurize the cooler but doesn't really flow through since it short circuits to the t'stat exit port. When hot the plug moves to isolate the t'stat inlet port from the outlet port forcing the flow to go through the cooler. Methinks that your return is deadheaded, like nowhere for the scavenge oil to go to so huge pressure spike on the whole cooler system.... (IMG:style_emoticons/default/agree.gif) oil return has a restriction and pressure side just builds up pressure until something go's pop,in good condition the 911 pump can make big pressure when faced with a restriction. Just my 2 cents ok. |
roblav1 |
Jun 27 2020, 08:40 AM
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#15
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
Yup, oil filter console installed wrong. The black blocked off port was facing the tank orifice. An expensive and time consuming mistake. So enter the cooler into the wall of shame. Thanks guys for all the suggestions and comments.
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mb911 |
Jun 27 2020, 08:45 AM
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#16
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
Well just a cooler not an engine so thats positive.
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roblav1 |
Jun 27 2020, 08:56 AM
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#17
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
That's right Ben. Also on the positive side, I inadvertently pressure tested all my made up hoses!
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gandalf_025 |
Jun 27 2020, 09:32 AM
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#18
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Senior Member Group: Members Posts: 1,453 Joined: 25-June 09 From: North Shore, Massachusetts Member No.: 10,509 Region Association: North East States |
Last time I saw that happen, cost an intermediate shaft
and massive damage to a turbo oil pump.. Had to split the case to replace the oil pump and shaft... Wasn’t pretty or fun... |
mb911 |
Jun 27 2020, 09:45 AM
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#19
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
With the cooler popping so quickly I doubt any damage took place. There wasnt extended pressure.
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ClayPerrine |
Jun 27 2020, 09:58 AM
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#20
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Life's been good to me so far..... Group: Admin Posts: 15,468 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
BTDT... cleaned up the mess from it.
Mine wasn't from a misaligned filter console. 50wt Valvoline VR1 + 35 degree day + no thermostat + 3K rpm at startup = blown $500.00 factory 964 oil cooler. (IMG:style_emoticons/default/headbang.gif) I replaced the oil cooler and changed to 20W50 Valvoline VR1 to fix it. |
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