Recommendations from 356Talk Members
(Ken Daugherty:) One method to clean the 356 oil cooler is to turn it upside down, fill with lacquer thinner and let soak overnight. In the morning, drain it and then refill with Simple Green or Bleche White and let soak for another day. Then drain it and rinse thoroughly with hot water until it runs clear. Blow it out and refill with WD40 (it is a water dispersant) and drain and blow dry. Fill with clean motor oil and let stand until ready to use.
(Wyatt Blankenship, Tom Martinez, and other recommend:) Lanfried Ultrasonic Cleaning, 20730 South Main St, Carson, CA. Contact: Jerry Marquez. Tel. 327-8930.
(Alan Klinger at The Stable says:) Send it to Ultrasonic Cleaning in Carson, CA. They will get it absolutely clean, clean enough to FAA certify it. If you could see the process they is no way you can replicate it. They flush and filter the effluents with special solvents and they check the flushed solvent for debris.