After installing front oil cooler, ready to start for first time- what to do?

[jjs3rd914]

Just completing installing a Mocal cooler and flexible lines on a 1974 911 that had no front fender cooler. About ready to start for the first time. Have questions on this procedure.

- Do the lines and new cooler have to be "primed" and filled with oil?
- How much extra oil should be put in (if at all) initially upon start up versus a normal oil change?
- How much extra oil capacity is actually added with the lines and cooler?

Note the Mocal oil thermostat is being used.

Are there any concerns with getting this running the first time? Please advise and thanks in advance.

Jeff 1974 911.

[RSTarga]

I'd start with 8-9 quarts and drive it until the thermostat opens, at which point oil will be pushed through the system, then check oil and top up. Total for a stock setup is about 11-12 quarts, for first fillup.

[josborn10]

Hello JJ,

Did the MoCal folks mention if you would need a higher-output oil pump?

J

[blucille]

agreed, you'll probably be close to 12 quarts after the tstat opens.

I'd suggest you disable the ignition system by your preferred mothod, disconnect the coil wire, unplug the CDI....I suppose you could pull the fuel pump fuse, but there's often some residual pressure....whatever your method, disable starting, crank it over on the starter motor until you see the oil pressure gauge start to move, oil pressure light should go off.....that'll get you primed.

[Chuck Moreland]

No need to prime. Just fill the tank as you normally would and start the engine.

Monitor the oil level. Top off as required.