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HomeTech Articles > Remote Oil Cooler Installation

Guest Technical Article:

Remote Oil Cooler Installation:
Thermostat Installation
Tom Sharpes

Thermostat Installation

The Mocal thermostat used in this application is different than the Porsche OEM unit and required a little explanation to understand how it works. It is a very simple design and very effective and also provides the ability to hook up your hoses in a straight line.

When the oil is cold, it flows from the engine to the thermostat and because of the high viscosity of the oil in the lines going to the cooler it takes the path of least resistance and flows through the open poppet section in the center of the valve and back to the engine. As the oil is heated it increases the temperature of the thermostat causing the center poppet section of the valve to close, directing the hot oil through to the cooler. The oil goes through the cooler and returns to the engine through the lower portion of the thermostat
The hoses enter the rear wheel well after being routes through the rocker panel. The thermostat was installed "in line" directing the hoses over the top of the wheel well.

Engine Plumbing

The original configuration has the oil line going directly from the engine to the oil tank.

The existing lines were tough but not impossible to get off. I used a propane torch to heat them up to make it easier.

You have to be very careful with the line that comes from the engine. Use a second wrench to prevent twisting  the hard tubing.

With the old line removed I cleaned up the fittings and put some anti-seize on the threads to protect them.

You will need to use 30MM to  -12AN adapters on the engine fittings so that you can attach the hoses. These are available from Pelican Parts.

With the adapters installed I attached the -12 hoses that have standard AN fittings on them.

I used 90 degree elbows to route the hoses over the top  of the wheel well, rather than by the side of the tires ,because the hoses came too close to my fat tires for my comfort.

With a 45 degree drop in temperature, this project brings a new meaning to my license plate !

Comments and Suggestions:
JP Comments: Nice, write up. However if the bolt heads are shown in the correct location on the mocal diagram, the oil flow is shown incorrectly.
March 5, 2013
  Followup from the Pelican Staff: Thanks for the input on this one. We appreciate the help.
- Nick at Pelican Parts
73ciscuracao Comments: Hi guys,
I'm new to the P-world, just purchased a 73CIS I love itand in the process of buying an external oil cooler. When installing the external oil cooler, would you recommend removing the internal cooler alltogether cooler air for the cylinders ?
September 4, 2010
  Followup from the Pelican Staff: No, the external cooler works in conjunction with the internal engine cooler. Don't remove it - it shouldn't affect the cooling of the cylinders. - Wayne at Pelican Parts  
Red Chi Comments: Any mechanics in N. Cal that's installed one of these successfully and willing to install one in my 74? Labor cost?
September 3, 2010
  Followup from the Pelican Staff: I would check with your local Porsche club chapter. They can help you find a shop. - Nick at Pelican Parts  
Chris Morse Comments: Thanks Wayne,

What do you think of the -16 Mocal unit compared to the factory thermostat???

Appreciate the help,

p.s. I'm looking forward to receiving the factory shift kit from you and yours
August 10, 2010
  Followup from the Pelican Staff: They both are pretty comparable to me. Never had a problem with Mocal stuff... - Wayne at Pelican Parts  
Chris Morse Comments: Doesn't the 74 have a thermostat?? Can it be used with a new front fender mounted cooler? Some material i have sen indicated that it has 30 mm fittings for better flow??

Ignorance is not bliss,
August 10, 2010
  Followup from the Pelican Staff: The stock car has an engine thermostat which regulates the flow of oil into the internal cooler (that is bolted to the engine). For external coolers, there is typically another external thermostat that is used to control oil flow to the external cooler. This thermostat is typically located inside the right-side fender, in front of the right rear wheel. - Wayne at Pelican Parts  

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