Okay tomorrow I finally have the time and guts to get down to business with rebuilding my s5 motor.

I have all the stuff to tear it apart and one rebuild under my belt already.

Of course I do not know if I'll need other internal components later but I'm pretty sure everything I bought should do the trick. I'm not looking for this motor to last beyond 30K. It's just to get it up and running nicely till I port another and hopefully supercharge it. So I went bare bones on this project.

Anyway, what has always got me is why do you buy different spacers for end play?

Is it because used side/intermediate housings have worn tolerences and there's more room for more endplay and thus a larger spacer is required. Or maybe new corner seal springs that are stiffer offer stiffer endplay so you need a smaller one?

I can make it work, but I just don't quite get the necessity of the spacer other than getting the endplay between a certain spec. I wish to understand these things you call "spacers".

 

You are correct - they are basically for different housing thicknesses.


-Ted

 

Sweet,

well that was easy.

Thanks -Ted

 

If you haven't already done so, buy the engine rebuilding video from Atkins or Rotary Aviation. It has a section on end play thats very well done.

 

****and there's more room for more endplay and thus a larger spacer is required.*****

Nope. A smaller/thinner spacer is required.

 

I'm sorry, but I've searched around the forums and I still don't understand endplay. Could someone explain it to me please? Thanks beforehand.

 

Endplay is exactly what it says, its the setting of end play of the ecentric shaft. Too much or too little end play will casue internal damage.

The setting is acheived by matching the correct thickness of space in the fron stack to the wear level of the front stack components.

First, the front stack is assembeled including the front hub and bolt torqued to 90 ft. lbs. The front cover and the oil pellet are not necessary for this step. Then in one of two ways the end play is measured. If the measurement is less than .0016" you need a larger spacer. And if its more that .0028" you need a smaller spacer. This is spelled out very well in the FCM, Haynes manual and the tape I recomonded above.

 

Thanks for the info!

 

http://www.mazdatrix.com/faq/pulley.htm

I never copied the page showing how to set the endplay, but this jpg coming up shows how to help determine if the needle/torington bearing has fallen down https://www.rx7club.com/attachment.php?postid=816369

Setting the endplay is just taking the slop out of the movement of the eccentric shaft in the fore and aft direction.

 

Sorry to bring up some old thread but it proves that I (even though I am new) search first and ask second.

My end play is .0365" So I need a smaller spacer to decrease my end play by .0115"
.0280"-.0365"=.0115" smaller

The spacers are as follows:

S 8.12 (0.3197)
T 8.10 (0.3189)
X 8.08 (0.3181)
K 8.06 (0.3173)
Y 8.04 (0.3165)
V 8.02 (0.3157)
Z 8.00 (0.3150)

The clearance should be

Standard: 0.0016 - 0.0028 (0.04 - 0.07)
Limits: 0.0035 (0.09)

I have a "Y" spacer in mine right now. So a "V" spacer would be correct replacement??

 

Endplay... is that the opposite of foreplay?

 

C'mon hermit. I was anticipating a real answer but instead I get lounge stuff!

 

No that's not right either

.0365-.0280=.0085

I need a spacer that is .308" which they on't make correct?

 

Bah, excuse me for trying to bring a bit of humor in because I'm in a good mood. I'll just go back to uselessness.

 

No worries, I am just stressing. I need the motor to go together smoothly. I am about 6 weeks behind where I wanted to be in this project.

 

When Bruce T is talking about replacing bearings, He is referring to the ones I am working with under the front cover. Not the ones in the rotor........right......right....Stress......right ??

 

are you using new bearings to get those readings? and i assume you meant .00365" or you are a ways out of spec...

if you are using a Y spacer right now and new bearings then i would go with a Z spacer, because V would only get you barely within spec and once the bearings break in it will be out of spec again. if you are using old bearings, then by your readings they may be worn out, look for pitting in the roller bearings and grooves in the bearing races, replace anything that looks like it is worn.




as to the main topic here, end play is necessary in any engine, there must be a forward thrust surface present in almost all engines and a tolerance is required because if there is no tolerance then the bearings would be destroyed. end play does not relate to the rotor housing dimension, it is independent of the front cover as you can bolt the e-shaft to the front cover independently of the rest of the engine and the end play will remain the same.

too much end play can also give lateral movement to the rotors as the e-shaft 'walks' in the engine and cause premature bearing wear.

 

Yes it is .00365. Sorry.

I am using the old bearings.They look really good but you know it could be worn.

I will price the new bearings and make a decision whether or not to buy a new spacer or bearings or whatever.

Thanks for checking my work. I am here with the wife and kids but they don't get into the motor thing. And for Christ sake I live in Irvine. My neighbors don't know where their dipstick is on their car. If they knew I was rebuilding a motor in here....some would call the news others would call their clergy, while most would call the association and have my motorless Rex towed away!!!

 

lol, i must drive my neghbors nuts with the gas powered air compressor and impact gun and dremel going at it! i love living in a hick town.

be sure to check those wear surfaces of the plates to be sure there is no grooves worn in them.