primer problem

primer problem

I have a 1975 cessna 172m and the primer is real hard to push or pull and lock.  Solutions?

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Re: primer problem

My primer gets sticky now and then.  I suspect the orings are getting old and hard and the plunger gets slightly gummy.  I put a little WD40 on a paper towel and clean off the plunger.  Seems to work for quite a while.

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Re: primer problem

A light coating of fuel lube will last much longer than WD40 and is O ring friendly.

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Re: primer problem

Addendum to my previous post...... If the primer O rings are worn or hardened they should be replaced. A leaking primer can cause an excessively rich mixture and higher than stated fuel consumption. After replacing the O rings coat them with a light coating of fuel lube.

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Re: primer problem

On my 172 we quite using the primer 5500 hours ago. prime it with the throttle. This worked for over 5000 starts

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Re: primer problem

What specifically is "fuel lube" and where can you get it.  I saw nothing by that name in either the aircraft spruce or chief catalogs.
thanks, joe

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Re: primer problem

If you have an AC Spruce catalog (2009-10) check page 381, the product is called EZ TURN Lubricant / fuel Lube. On another note, priming the engine with the throttle is a sure way to get yourself an induction box fire. It is not IF it will happen but when...

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