Valve guide removal on the L-134 - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-22-2000, 04:56 PM
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Valve guide removal on the L-134

Time for the surgery. What's the best way to drive the guides out on the L-134? Chiltons is vague and talked about pulling the engine. Information is worse elsewhere. Help!

Thanks guys.

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post #2 of (permalink) Old 03-22-2000, 06:39 PM
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Re: Valve guide removal on the L-134

I have never done valve guides in an L134, but lots of farm tractor engines and I think this procedure will work: first drill and tap the old guide for the next larger size bolt. second, decide if you will drive or pull the guide (this is determined by engine design and if the cam will be removed), if you can drive the guides out then screw a scrap bolt in from the opposite direction and then use a long punch placed down into the guide to drive it. the theory here is that drilling and tapping will weaken the guide, and driving through the guide will do two things, prevent mushrooming the end of the guide and slightly shrink it as the punch will tend to stretch the guide rather than compress it.
If the guides will be pulled then simply screw all thread in the guide and place a stack of washers over the valve seat, then run a nut down on it, if the guides are not to tight and the all thread is of good quality they will come out.
good luck, jjc

post #3 of (permalink) Old 03-22-2000, 07:05 PM
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Re: Valve guide removal on the L-134

Any chance of the guides having a taper in the block? Also, they seem like they'll hit the lifters before they're through and out.

Thanks again,
km


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post #4 of (permalink) Old 03-23-2000, 08:04 PM
 
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Re: Valve guide removal on the L-134

I've cut the head off of an old valve, and drilled the center.
This centers the puller in the valve pocket, and protects the valve seat.

You will still need to stack washers on the valve head to strengthen it for the pull.
A harmonic balancer washer (very thick) makes a good choice.

Don't use impact tools, it will only strip the threads off of your bolt or all thread.
Fine threads will give the most pull, but if your guides are brass lined, fine threads may pull out.

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