Question about Harley Davidson FLSTC - FLSTCI Heritage Classic Motorcycles
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.
Posted on Mar 15, 2011
I think the SE pushrods have a 32 TPI pitch on the threads. If so, with the tappet all the way down in it's bore, adjust the pushrod longer until it make contact with the tappet plunger. Now, continue to lengthen the pushrod by 18 flats or three turns. Allow the tappet to bleed down before you turn the engine over. When you can turn the pushrod with your fingers, you can safely turn the engine.
The object is to adjust the plunger in the hydraulic tappet to approximately the middle of it's travel. The tappest have about 0.200" of travel. So, you want to adjust the pushrod out until it has zero clearance then go another 0.100" inch. You can measure how much three turns lenghtens the pushrod before you install them just to make sure.
Posted on Jun 02, 2010
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