 Stock oil cooler seals |
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| Geezer914 |
 Apr 4 2026, 03:48 PM
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#1
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Geezer914  Group: Members Posts: 2,263 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States 
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Replaced the oil cooler seals and it is still leaking oil. Start up pressure is 80lbs. Would that cause the oil to leak at the seals? Anyone ever had an oil cooler leak? (IMG:style_emoticons/default/confused24.gif)
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| mepstein |
Apr 4 2026, 05:01 PM
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#2
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914-6 GT in waiting Group: Members Posts: 20,593 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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They shouldn’t leak, even at that pressure. When we test a 911 cooler, we pump them up to 60+ to make sure they aren’t leaking.
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| 914sgofast2 |
Apr 4 2026, 05:35 PM
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#3
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Senior Member Group: Members Posts: 798 Joined: 10-May 13 From: El Dorado Hills, CA Member No.: 15,855 Region Association: None |
New or used oil cooler? Jake Raby just had a rant about the poor quality of the new oil coolers being sold that he posted two (2) days ago on his Type 4 performance engine Facebook page called "Raby's Aircooled Technology". Raby stated that he only uses old German made oil coolers that he has thoroughly cleaned using his ultra sonic cleaner and his "special sauce" proprietary cleaning fluid. Raby said his cleaning process takes several days of cleaning and degreasing and frequent changes of the special cleaning fluid he has developed for use in his ultra sonic cleaning machine. And before you ask, he does not sell his refurbished oil coolers unless you buy a complete engine from him.
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| brant |
Apr 4 2026, 07:06 PM
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#4
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914 Wizard Group: Members Posts: 12,170 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Used to run a type 4 race motor with a big oil pump and 100 psi cold starts
Never had problems with cooler seals (fresh). Blew safety valves on the Accusump at 120psi on a cold race morning below freezing in Topeka |
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