The resistance I was talking about was during the gear lash interval, not when you are turning the engine.
Crankshaft endplay is unrelated to the gear drive input shaft endplay.
From Page 2 of the installation guide:
1. Prior to assembling the drive on the adapter plate might be a good point at which to familiarize yourself with checking the input shaft endplay. This will also get you familiar with how the parts of the drive go together. First, place the main housing on your workbench with the prop hub facing down. Assuming you have not removed them, the planet carrier assembly, it's thrust bearing and the ring gear will already be in place. If not, install them now. Next, install the nylon snubber over the prop shaft so that it rests against the planet carrier bulkhead. One side of the snubber I.D. may be beveled and if so, the beveled side goes down. If both sides are beveled, place the most deeply beveled side down. Now place the rear spacer ring over the main housing with the flat side up. Lightly tap the spacer around its circumference with a nylon head hammer (or similar blunt instrument soft enough to avoid denting the aluminum spacer ring) to insure that it is seated into the recess on the bottom side. Now oil the input shaft pilot bearing and slide the sun gear into the planet assembly, turning it as necessary to align it with the planet gears. Push it all the way down until it seats against the snubber. Install all the parts of the input shaft thrust bearing assembly on the back of the sun gear. See the drawings for the proper order of assembly. Turn the input shaft and verify that the main housing rotates freely without binding at any point in its rotation. Now check the end play of the whole assembly by placing a ruler edge-wise across the spacer so that it overlaps the rear race of the input shaft thrust bearing. There should be between .001 and .030" clearance between the lower edge of the ruler and the thrust bearing. If it appears that there is no clearance, push down on the input shaft. If you can measure any clearance when the shaft is pushed down, the clearance is acceptable as long as it is less than .031". This check should be done at any time that the gear drive is assembled or after inspection or maintenance.
Tracy
On Tue, Apr 15, 2008 at 12:48 PM, David Staten < Dastaten@earthlink.net> wrote:
Tracy..
when you say endplay, are you talking about ENGINE endplay or endplay in the PRSU assembly? On the initial assembly we never felt anything during hand rotation of prop that we didnt attribute to normal compression forces of a newly rebuilt engine. Gear lash appeared within limits and not excessively limited (at the time of assembly a long while back)
Dave
Tracy Crook wrote:
Noticed a couple more clues in the pictures.
The input shaft pilot bearing appears to be stuck on the prop shaft pilot. The overheated snubber (see instructions for part names and locations) and bearing seizure on prop shaft could be due to improper endplay (too little). Normally not necessary but did you happen to check it during assembly? Also, did you check the resistance of prop movement in the system lash range after assembly? There should be very little, almost none. If the endplay was tight enough to cause this, the resistance should be enought to feel.
Tracy
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