"Concentrate on stopping the crud before it gets to the tank. "

My fear is when filling the tank it enters.. you are open to atmosphere.. thousand ways it could happen..

IF I understand it correctly.. on a stock 911 if I get anything in there its going to my engine. Is that correct? Or do I have it wrong.. Im gonna go try and find a diagram..


thanks for the very informative write up!

JP

You are absolutely correct. If you put crud in through the oil tank filler neck, you can expect it to pass through the large diameter rubber S hose into the oil pump, and thence into your bearings, or cam spray bars, or some other bad place.

So don't let that happen.

If the foreigh object is large enough (like the dipstick, which is frequently dropped into the tank), don't sweat it - it will stay there peacefully, as it is too large to escape.

The outlet from the tank is a bit above the bottom of the tank. So there is a slight chance that crud might settle. But I'd not count on that.

Filling nowadays is usually from a plastic oil bottle. No steel spouts with a punch end for cans, which a careless guy could leave in his cat's litter box of something.

Or a funnel?? with something on the bottom you didnt notice? thats my fear.

So don't use a funnel. You don't really need one. Toss a few rags under things in case of drips while getting the can's opening into the hole.

Have to agree with Walt. Stop the crud getting to the tank. If you can't trust yourself from keeping foreign objects out of the filler when changing or checking oil, maybe someone else should be doing it.

As for keeping debris out of the tank from the engine, for a normal street engine, changing the filter between oil changes seems to be a good idea.

For a greater measure of protection you can run twin oil filters in the scavenge circuit. One filter would be the primary filter just as stock, with the second in the bypass circuit. Add a pressure switch in the bypass circuit with a light on the dash and you will have visual indication to go along with the audible grenading of your engine.

Peter