How hard is it to put a new motor together?..I have all the parts i need to put a new 87TII together. New rotor housings, sides, gaskets, & apex seals!..I will be using the same rotors though (clean). I bought a video on how to rebuild a 13B rotary engine and by watching the builder and seems simple.

People with experience:
What do i have to be aware of when putting it together?..
What causes end play???...

 

I also have SHOP MANUAL and HAYES as my guide!..

 

Just from my experience, you are about to enter HELL.
I have torn down 2 12a's.
they are still in pieces.
Since you have new parts; it should be not quite so bad.
The rotary engine is like a stack of pancakes.
Each layer builds on top of the last.
First you need to put your front interm. housing on top of your font housing.
Then, using vasoline you have stored in the fridge overnight, seal the apex seals and such to the rotor. This is very important that you get them tight; because the rotor has to be placed inside the housing very carefully or else you'll lose all the small pieces.
assuming you have checked clearances on all oil/apex/side/springs; now you put the intermediate housing on.
But you need to put the water seals in place first.
use that vasoline to seal them down tight; and use some form-a-gasket in order for it to seal correctly. This has to be done rather quickly as the weld will set up fast.
insert the eccentric shaft. Get all the gears and bearings in the front housing lined up. This will be a royal pain.
Next layer, put on the 2nd rotor housing. Insert your prepared rotor. Put on the rear housing with the seals and formagasket.
Tighten down those tensioner rods QUICK!!! BUT, tighten each bolt a little at a time, a little more at a time. . .you get the idea.
This will prevent any gaps in the housings due to improper torquing.
Whew! Your finished. Now go to www.Mazspeed.com and get some advice from people who have actually done this. They will help you out more than I can.
Best of luck,
Joe
P.S. Make sure you mention its a 2nd gen. These guys dont' suffer fools too gladly. :p

 

I've read through the proceedure more than once in my Haynes manual and from what I can tell it doesn't look too incredibly difficult, it just need to be done pretty quickly so everything seals properly.

Thanks for the Vaseline trick, I've always wondered how they keep all the seals in place when you drop the rotor in place.

 

I like the HAYES book but i think the SHOP MANUAL gives more detail!..I will try to do more research and most likely do the rebuild myself.

 

Yeah those Vaseline are great arent they?!?!..I cant wait to start working on my new motor!..Its the beggining of my ROTARY ENGINE ADVENTURE!..something to tell my future kids that i've worked on this UNIQUE ENGINES!

 

This is my first experience with ANY car.. and I found it pretty simple... In my case, my problem was just TIME.. I took a bit to get the parts I needed, It took a good month just to get them to me (stupid people didn't ship them on time grr) and I was without my car for 2 months.. But since you have your parts ready, you shouldn't have that problem,...

Most importantly. just be patient.. You KNOW anything that can go bad, WILL!!! I havn't heard of or seen a perfect rebuild and installation without lots of bad things happeneing... But you get passed them... Cursing helps a lot I found =)

Then just like everyone said, go with your FSM and install parts layer by layer... Once you get the acual CORE rebuilt, the rest is easy... The core is a lot of aligning seals.. making sure you DONT PINCH A WATER SEAL!!! oil control rings on Rotors go a certain way.. stuff like that..

I had 2 friends helping me.. so we just held 1 apex seal each when we placed rotors into the housings... Then checked to make sure we got it right....

Easy as cake... You can have it taken apart and rebuilt in 5 hours if you know what you are doing.... took me that long the 2nd time =)

 

Thanx man!..As of now im only missing all the lubricant and sealant stuff!..This sunday im gonna go ahead and clean the rotors and have them measured by a friend of mine who works for a rotary shop. Yknow i was watching a video on how to rebuild a 13B and the guy put a rubber band around the rotor to hold the NEW APEX SEALS that he instald. Pretty good idea!
I will let you guys know how the adventure went. =)

 

Just a small word of caution that may not make sense until you reach the point of installing the apex seal springs under the apex seal. When I get the apex seals they have a triangular end piece that is glued to the apex seal. When I put or rather shove the apex seal springs under the apex seal, once and a while the triangular end piece comes unglued. Never phased me in the past. Just took fifteen minutes to get some eastman 910 and glue that puppy back on. Continued on with the installation. Well.......about 2yrs after rebuilding my 87 it started pumping water out the overflow. Took it apart and found that corrosion had eated thru one of the sides of a water groove. Ok. Was not something I did wrong. Just should have inspected the walls of the seal grooves better. I set the engine aside for a year. Today I started cleaning it up for a rebuild because I aquired a new used rear housing. Bottom line is I notice that the triangular piece is still glued to the apex seal. Should not be so. I thought the heat would have broken it loose. Would have seperated. Did Not.

 

I used Atkins Apex seals on my rebuild. They are a LOT easier to install than Mazda's. The corner piece stays in place even without glue. Just make sure those factory corner pieces don't get stuck between the housings when closing it. Superglue will do just fine in case you want to glue them. Isert the seal just a little then puth the large spring in place, slide it in some more then insert the small spring, slide them down and then put some supergle on the corner piece, press down on it for a few seconds ant it will stay in place. They should come apart when torquing the engine.