I am performing an engine overhaul. The shaft turns smoothly and
has end    play without binding before performing the eccentric end
play check. The end    play is 0 and I have gone to a maximum spacer
thickness of 8.12 mm spacer    stamp s which gives a slight end play
clearance until tightening the bolt.    It still turns smoothly with
a nice compression popping sound. The bearings    are properly
mounted on the spacer and 2 thrust plates are installed per    procedures.

Any ideas on this ?

John P

I assume you have the shop manual.

One can download them from here free.

http://foxed.ca/index.php?page=rx7manual


Paul Lamar


Paul

I have the shop manual and other Info. I  overhauled  other rotary
engines but may  have ignored previous eccentric shaft end play.

John P

Final assembly must be done vertically as the needle bearing can
fall out of place. That is about the only thing that can go wrong.
Most manuals do not cover that well. In fact it shows it
done horizontally. The 76 Cosmo manual is very clear on this.
Step 1 is turning the engine on the engine stand so the front of
the engine is up.

What year is this engine?

Maybe I am missing the point here.
If so the attached pictures and above text are for the new guys.

Perhaps you need to machine a longer spacer.
I have a guy that can do that and he only charges $35 and hour.
If so send me a spacer he can measure and  make a new one.

Paul Lamar


Paul

I would like to take you up on your offer for a thicker spacer.
The only difference in the above listed spacers is that I would try
a 8.14mm thickness spacer. The engine is a 1991 2nd generation. The
eccentric end shaft is straight 30mm dia. The spacer inside diameter
must be slightly larger for clearance. The spacer od is 35mm-. The
needle bearing race id is 35mm and rides over the spacer. Any of the
above spacers could be measured and checked against clearance to the
30mm eccentric shaft and 35mm id needle bearing races. The
additional required 8.14mm thickness is then required. I will send a
K stamp 8.06mm thickness which fits another engine and gives the
same required inner and outer clearances. The bearing race is
included to check spacer clearance. If the 30 mm dia eccentric shaft
is available it would be nice to check for clearance to the new spacer.
Please send forwarding address and cost.

Thank you
John P

I am guessing at the cost. Perhaps $50 if it is less than that I
will put the change in the box. If more than that I will eat it. The
largest problem is coming up with a piece of steel. If my local
supplier has it in stock no problem if not I have to mail order it
and there may be a minimum. I really big bolt would work. If you
have a piece of steel we can use that.

Mail address is:
830 East Santa Maria St.
Suite 303 <<<<<<<<<<<<<<very important
Santa Paula CA
93060

Paul Lamar


I deleted the photos of the end play spacer and bearing. It looked to me the
brg ID was not sufficient for the OD of the spacer. Parts from two series
mixed up??

Dale Davies

    Paul

I have been able to have a 8.14 mm thickness spacer made which fits the end
play required per spec.
] don't know how far you have gone on my request for the thicker spacer. If
it arrived late and not too far in progress then please return it and adjust
the costs involved. If already done then so be it with my thanks.
I earlier tried using the local machine shop to lap grind my side housings
but he did not have a lapping machine so I sent them to SC.  After taking
you up on your offer (a bird in hand) I remembered the local shop does CNC,
lathe work and other machine shop work and he said he could perform my
request.
I thank you for your offer and am sorry to cause you unnecessary work.
At any rate have a merry Christmas.

John P                   

No problem. What ever it is I'll send it back.
I suspected the problem was caused by lapping the end housings.

Paul Lamar