Hydralic valve lifter replacement on Cont. 0-300 engine

Hydralic valve lifter replacement on Cont. 0-300 engine

I have a Cessna 172F with an Continental 0-300 that has a bad lifter.  They have a mushroom head on them where they rub the camshaft so they will not pull out of the case like some Lycomings or even a small block chevy.  Is there anyway to remove and reinstall a new lifter without pulling the engine and splitting the crankcase??  I could cut the old lifter and get it out of there if someone made a new lifter without the mushroom head that would just slide in from the outside of the case.  This engine has just 800 hrs on it and I hate to tear it down over just a bad lifter.  Any ideas out there?  Thanks, Joe

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Re: Hydralic valve lifter replacement on Cont. 0-300 engine

If you are trying to get the "cam followers" out, the only way that this will be possible is by splitting the case. The hydraulic lifter, is a two piece unit consisting of the cam follower and the lifter unit. The lifter can be removed by using a hooked piece of safety wire and sliding it out of the cam follower. Do not use a magnet... The cylinder and the pushrod housing will have to be removed to access the lifter, hope this helps...

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Re: Hydralic valve lifter replacement on Cont. 0-300 engine

Thanks for the reply.  I called my A&P and the problem is with the cam follower.  About 3/8" of the outside sleeve has cracked off at the end away from the cam.  Everything moves freely, the engine runs fine.  We were installing new gaskets at an annual when we found the cracked pieces in the lifter cover.  The pieces look like they have been in there forever.  The cam follower still has about a inch and a half of sleeve left in the block.  On any other engine I own I would just run it as it is.  But my A&P says that's no good on a plane.  I have a son in an A&P program and he is asking his instructors about it too.  What would you do if it was yours?  Run it or tear it down?  Thanks for your help.   Joe

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Re: Hydralic valve lifter replacement on Cont. 0-300 engine

My vote would be to tear it down, most of your expense will be in labor, as the rest of the engine is fairly new, and as long as nothing else is found, it should be able to be put back together.  Additionaly I'm not sure if your A&P will sign it off with a known problem like this, as I think there would be some liability should something happen.

Tom
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Re: Hydralic valve lifter replacement on Cont. 0-300 engine

The problem will not get any better and you risk contaminating the engine with metal, once it gets mixed in with the bearings it will probably "lunch" the engine. When I was in A&P school, many moons ago, it was always stressed that you can't park it on a cloud and fix it. The longer you run the engine in this condition, the worse it will get not to mention it will get very expensive.

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