Jump to content

IGNORED

wide ratio FS5W71B slipping out of 3rd & 4th


Jeff Berk

Recommended Posts

14 minutes ago, Jeff Berk said:

I'm assuming that the dust sleeve and seal need to be removed to pull off the tail end of the transmission.

The dust shield comes right off with the tail shaft housing.  The output shaft is hanging free inside, no need to mess around back there. 

If you don't have even a tiny gap at the mating area with the adapter plate (the solid metal plate between the front and back) then it's probably just glued together with sealant.  Give it some side to side love taps to break that seal.  The FSM procedure is pretty thorough.

Dust shield still attached.

image.png

Edited by Zed Head
Link to comment
Share on other sites

OK, I pulled off the front transmission case. Keep in mind that that I have not done this before so I'm not 100% sure what I'm looking for. 

What seems to jump right out is that the baulking rings seem to have some teeth chipped off. My problem, however, was that I'm slipping out of 3rd and 4th gear.

 

Annotated.jpg

PXL_20210105_011422231x.jpg

Link to comment
Share on other sites

Yes, your synchros (baulk rings) look terrible. Looks like one has been completely destroyed.

From what I've seen, just over the few years I've been browsing Z car internet stuff, I'll bet that one of the bearings in the adapter plate is falling apart. Grab the shafts and wiggle them around while you try to see down at the bearing area.

Check this recent thread out.  It shows the aftermath.  But the gears themselves seem very durable.  Several people have just replaced bearings and synchros despite the damage and been back to like-new condition.

https://www.classiczcars.com/forums/topic/64776-280zx-5-speed-wont-reverse/?do=findComment&comment=613709

 

Link to comment
Share on other sites

If you look at MT-16-2 below, there is a little play in the main shaft at the point where it's shown as being separated from the rest of the shaft. I'm assuming that's normal. I can see the bearings in the adaptor plate and it appears to be in good condition with no play in the shaft as I try and wiggle the shaft.

Could the worn synchros be causing the slipping out of gear? I thought it would just be a problem getting into gear.

It looks like I might be able to do the rebuild myself as long as I don't need a press. If it gets too rough, I have a local mechanic that has worked on these transmissions I can fall back on.

image.png

Link to comment
Share on other sites

Once you get chunks of metal floating around in there things can get jammed up.

zKars had a whole writeup on a transmission rebuild.  Others have also.  EuroDat comes to mind.  Tools can be fabricated.  There are basically two things that hold a gear in place once it's chosen, the balls in the adapter plate, and the inserts under the coupler sleeve.  It's late and I might have picked the wrong words but overall it's simple.  Making it all work right can be complex.  Definitely doable, but challenging.

Link to comment
Share on other sites

I haven't looked but I seem to recall Dave WM, and maybe others, not finding the destroyed adapter plate bearings until they took things apart.  Some people rebuilt their transmission's for synchros and found the bad bearings by accident.  Most people are surprised at how well the transmissions work even with all of the damage.

If you didn't find any metal it might be that somebody already cleaned the drain plug.  Anyway, I think you need to tear it down all the way.  zKars, Dave WM, EuroDat, others I'm not remembering have all written some good stuff about it.  I'll post links as I find them.

 

Link to comment
Share on other sites

Thank you Mayolives! There are many tips in there that will help. I'm on hold waiting for a bearing puller/splitter to arrive. I'm also mounting three dowel rods on my work bench to sting components on in order so that I can put everything back in the proper sequence and direction. It was suggested that I engrave an F on components on the side facing the front. I might do that as well.

I'm assuming roll pins should be replaced with new ones but snap rings are fine to reuse. Correct?

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.