Question about Harley Davidson FLHTC - FLHTCI Electra Glide classic Motorcycles

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How to replace o rings on pushrods 1989 harleydavidson27 motorcycle

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  • peter steeves Jul 22, 2011

    i was told they are collapsable rods, and i won't need to remove the rocker boxes...



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I'm assuming that you're talking about replacing the O-rings on the pushrod tubes. If so, you must remove the upper and middle rocker boxes from both cylinders. Then, you'll have to remove the rocker arms, one at the time, and replace the O-rings on the tubes. Do not mix the pushrods up. They are color coded and go in a specific location.

Good Luck

Posted on Aug 31, 2010


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What is the adjustment for the pushrods screaming eagle

When you adjust the pushrods on any H-D Evolution or later engine, you must compress the tappet by 0.100". According to the list that I have, you must turn the pushrod three complete turns (18 flats) to lengthen it this much. I'd double check your pushrods to make sure this is correct. Find a point where you can measure the pushrod and take a measurement using a dial caliper. Turn the pushrod to extend it by three full turns and remeasure the pushrod. It should be 0.100" longer.

To install your pushrods, bring one piston to top dead center on the compression stroke. Make sure that both tappets on that cylinder are as low as they go in their bores. Install the pushrod with the pushrod tube into the head. Make sure you've got the O-rings in the head and the tappet block. Extend the pushrod by turning it with your fingers until it gets tight. Then, turn it three more turns using wrenches and lock the locknut. Do the same with the other pushrod. Let the engine sit and do not turn the engine until the tappets bleed down and you can again turn the pushrods with your fingers. This may take as long as ten minutes. Once you can turn the pushrods by hand. Bring the other cylinder to top dead center on the compression stroke. Make sure that both tappets are at the low point in their bore. Install the other two pushrods the same as you did the first two and allow the engine to set until the tappets bleed down. Once you can spin the pushrods in your fingers. Finish installing the pushrod tubes.

Now, this is accurate provided your pushrods have a 32 threads per inch adjuster. If not, you must figure out how many "flats" that you have to turn the pushrod to lengthen it by 0.100". Substitute this number of flats in for the number of turns to lengthen the pushrod after you get it finger tight.

The tappet plunger has approx. 0.200" of travel in it. You want to adjust the pushrod so that the plunger in the tappet is about mid way in it's travel or 0.100" or there abouts.

Good Luck

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Looking for instructions to adjust valves on 1987 H.D.

If the engine is stock, there is no adjustment to the valves. The engine is equipped with hydraulic tappets that take up for any wear or heat expansion of the cylinders. The pushrods are non-adjustable but are of different lengths. They are color-coded as to what position they go in.

Now, if your engine has been modified and adjustable pushrods installed, they should work the same way unless they are way out of adjustment. Then, it depends on "whose" pushrods they are as not all pushrods have the same threaded ends on them. But, all is not lost.

Take one of the pushrods out of the engine and adjust the pushrod as short as it will go. Now, turn the end out until it makes the pushrod exactly 0.100" longer while counting the "flats" on the adjuster. When you install the pushrod, make sure the tappet is at it's lowest point in the bore. Put the pushrod in, don't forget the tube and the new O-rings, and adjust the pushrod out until you have zero backlash. Then adjust it out the additional number of "flats" that it took to make it exactly 0.100" longer. Lock the adjuster down. What you're doing here is the plunger of the tappet has a travel of 0.200" total and you're adjusting the pushrod so that the plunger is halfway in the middle of its travel so that it's got equal travel in both the up and down direction.

Good Luck

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If you have stock pushrods ther is no adjustment.

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