Front end play mystery -bad flywheel - RX7Club.com - Mazda RX7 Forum

2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
Sponsored by: Banzai Racing

Front end play mystery -bad flywheel

Reply

 
 
Old 06-18-17, 08:08 PM
  #1
Senior Member
Thread Starter
iTrader: (6)
 
freq's Avatar
 
Join Date: Jan 2006
Location: Boston, MA
Posts: 597
Thanked 0 Times in 0 Posts
Front end play mystery -bad flywheel

I had this issue on my rx8, but wb the same issue with my TII, so thought I'd post it here.

Seems like it is possible to over-torque that flywheel nut.

And if you do, it can throw off the e-shaft end play.

Putting the engine back together, I tried the largest end-play spacer I could get and still couldn't keep the front counter-weight from contacting the needle-bearing that sits on the thrust plate when hand-tightening the hub bolt.

I must've put the front of the engine together 5 or 6 times.

When I finally decided to inspect the flywheel, I saw that there was an indentation where it contacts the rear gear. The indentation was just enough to screw up the end play.

A new (used, undamaged) flywheel fixed it.
freq is offline  
Reply With Quote
Old 06-18-17, 09:57 PM
  #2
Senior Member
 
Join Date: May 2017
Location: your mothers
Posts: 283
Thanked 14 Times in 14 Posts
that's why there's torque specs in the manual.
insightful is online now  
Reply With Quote
Old 06-18-17, 10:23 PM
  #3
Senior Member
Thread Starter
iTrader: (6)
 
freq's Avatar
 
Join Date: Jan 2006
Location: Boston, MA
Posts: 597
Thanked 0 Times in 0 Posts
Originally Posted by insightful View Post
that's why there's torque specs in the manual.
Agreed.

..but the lack of the equipment to measure exactly 300 ft/lbs of torque is why most peeps under or overtorque that nut.
I wld be surprised if there are more than 5% of the rx7's on the road that are running the correct torque specs on that nut.
freq is offline  
Reply With Quote
Old 06-18-17, 11:11 PM
  #4
Senior Member
 
Join Date: May 2017
Location: your mothers
Posts: 283
Thanked 14 Times in 14 Posts
well, to be honest, you must be using a huge *** 3/4 impact to be getting the flywheel on that tight. or putting oil/anti seize on the e-shaft and flywheel, allowing it to shimmey down over the taper.
insightful is online now  
Reply With Quote
Old 06-19-17, 06:51 AM
  #5
Senior Member
Thread Starter
iTrader: (6)
 
freq's Avatar
 
Join Date: Jan 2006
Location: Boston, MA
Posts: 597
Thanked 0 Times in 0 Posts
Originally Posted by insightful View Post
well, to be honest, you must be using a huge *** 3/4 impact to be getting the flywheel on that tight. or putting oil/anti seize on the e-shaft and flywheel, allowing it to shimmey down over the taper.
No impact. Just a 3/4" breaker bar and a pipe extension. I'm 6'2", 230 lbs which is bigger than the average guy, but I didn't think big enough to apply enough torque to damage that flywheel.

And it didn't shimmy down over the taper, it was torque'd down too much and compressed the flywheel inside the flange. This shortened the length of the assembly just enough to cause end play problems on the front side.

I'm just putting this out there to let peeps know to be careful, because it can happen.
freq is offline  
Reply With Quote
Old 06-19-17, 08:12 PM
  #6
Armchair engineer
iTrader: (2)
 
j9fd3s's Avatar
 
Join Date: Mar 2001
Location: http://www.k2rd.com
Posts: 23,508
Thanks: 0
Thanked 16 Times in 15 Posts
Originally Posted by freq View Post
No impact. Just a 3/4" breaker bar and a pipe extension. I'm 6'2", 230 lbs which is bigger than the average guy, but I didn't think big enough to apply enough torque to damage that flywheel.

And it didn't shimmy down over the taper, it was torque'd down too much and compressed the flywheel inside the flange. This shortened the length of the assembly just enough to cause end play problems on the front side.

I'm just putting this out there to let peeps know to be careful, because it can happen.
actually we do have the proper tools.

if the spec is 300 lbs/ft, you literally can apply 300lbs to a 1 foot bar.

or divide 230lbs/300 = 1.3, so 12" times 1.3, is 15.6"

so at 230lbs you can hang from a 15" bar and be torqued to spec.

i need a 2 foot bar..
j9fd3s is offline  
Reply With Quote
Old 06-25-17, 12:36 PM
  #7
I wish I was driving!
 
Join Date: Dec 2001
Location: BC, Canada
Posts: 5,136
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by j9fd3s View Post
actually we do have the proper tools.

if the spec is 300 lbs/ft, you literally can apply 300lbs to a 1 foot bar.

or divide 230lbs/300 = 1.3, so 12" times 1.3, is 15.6"

so at 230lbs you can hang from a 15" bar and be torqued to spec.

i need a 2 foot bar..
Yep. Just have to add that for this to be the case, the bar has to be level to the ground. You could also use a pull scale at the end of a bar extension.
Another option altogether is a torque multiplier with a standard torque wrench.
This one is geared at 5:1, so you just set your torque wrench to 60 ft-lbs. Also good for loosening the nut if you don't have a decent impact gun.

https://www.amazon.com/gp/aw/d/B00IVT1S76/ref=mp_s_a_1_7?ie=UTF8&qid=1498411956&sr=8-7&pi=AC_SX236_SY340_QL65&keywords=torque+multiplie r&dpPl=1&dpID=51N5QLLAiwL&ref=plSrch
scathcart is offline  
Reply With Quote
 
 
 


Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 10:21 PM.


All content Copyright 2007 by Internet Brands, Inc.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: