Question about 1993 Harley Davidson FXR Super Glide
To begin with, I assume you already have the old pushrods out. If you plan on cutting the old ones out, cut them with a pair of bolt cutters, not a "zizz wheel". The metal shavings and wheel grit gets into the engine unless you are very careful.
Now, most S&S pushrods are threaded 32 threads per inch. So, Check yours and make sure they are threaded this way. Adjust the pushrod as short as it will go. Then turn the adjuster out three full turns and measure the disance it lengthens the pushrod. It should be right at 0.100 inch. If this is correct proceed.
Bring one piston to top dead center on the compression stroke. This will be when the piston it at top dead center but both of the tappets are down in their bores. Insert the pushrod in the tube and make sure you have all the various O-rings for the tube in the tappet block and the head. Insert the pushrod into position and using your fingers extend the adjuster until the pushrod is tight against the tappet, zero lash. Then, turn the adjuster out an additional three full turns, 18 flats. Lock the lock nut down and do the same thing with the other pushrod. Do not turn the engine over until the tappets bleed down and you can turn both pushrods with your fingers.
Once you can turn both pushrods with your fingers, do the same thing with the remaining cylinder. Theory is the hydraulic tappet has approximately 0.200" travel in it. You want to adjust the pushrod so that the plunger is about halfway in the travel of the tappet.
You can also get this information on S&S's site. Go to their site, click on Technical section, click on installation instructions. The have the installation instruction for all their products online.
Posted on Jul 10, 2010
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Posted on Jan 02, 2017
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