teflon seal rings- input housing to center support

[turbodave231]

I have had problems getting a good seal between the input housing and the center support. I'm air checking the parts on the bench before they go into the case. I often get a cross-leak into the lube passage.

I've tried different brands of seal rings, and swapped parts with my supply of extra hard parts to find the best seal. I've even tried using the solid seal rings intended for the input shaft (and sizing them properly). Sometimes I find a good combo of parts other times not so good.

Anybody have any secrets to share? I'm looking to get the best seal at this location? In my experience, this one area seems to be the biggest cause of pressure drop, slipping and shift flair in the 200-4r.

Bruce, You listening?

 

[jakeshoe]

Teflon will not give a real good air check on the bench, but usually gives better results with fluid in operation.

Cast sealing rings usually give good bench results but cause erosion, and aren't as good as teflon in most cases...

 

[WE4]

You have..

a forward clutch crossleak. Very common. Put OD center support in press. appling justt enough force till you hear a pop will cure. Also if the forward clutch rings are not perfect it will cause bthis too. Also, put some oil in the passage and try again. Sometimes the oil will seal it. Make sure your bolts are tight and snap ring is positioned right. If the forward rings are small it will cause this too. Very little , especially aluminum piston mconstant bleed drums are known for this. Place to start anyway. You can bench test th e center support by itself, which is what I would do first. This way you eliminate rings as the problem.
If you look REAL close at the direct drum support you will see it has about a .100 clearence at the base. Shoot me a fax number and I will draw it out for you and explain what to do.
Also, Pan may make a difference. Ask others, it has cured their issue on this as long as you are not smokin clutches.
Bruce
WE4
www.PTSXTREME.com

 

[turbodave231]

Bruce,

Thanks for the suggestion on the center support in the press. How do you check the center support by itself? What do you use to seal the ID that feeds the input housing?

The bolts aren't an issue, I won't even assemble these parts into the case until I'm happy with the bench air check results first. I'll try adding a bit of ATF during the air checks.

I understand the pan issue. I'm using the 700 filter and usually keep the fluid level a bit higher anyway.

Not sure what you mean about the .100 clearance on the direct housing. My FAX is 586-947-9503.

All good stuff here! Thanks!!!!

Dave

 

[WE4]

Fax on the way.

Any questions call. 916-739-0510.

ck it close.
Bruce
WE4
PTS XTREME

 

[turbodave231]

Bruce,

I got the FAX. Thanks!!

I put the center support in the press last night and pressed the steel center shaft flush with the aluminum housing on the 4th clutch side.

I tried the air check again with new teflons and some red oil and didn't really improve the sealing.

The parts I'm playing with here are spare parts. The unit I am rebuilding seals up much better between the input housing and the center support.

I am trying to improve my rebuild techniques and this is one of the problem areas in the 200-4R that I struggle with.

Dave

 

[WE4]

Did you hear it pop?

It should have helped. If not, you got a ring problem somewhere. They can be buggers....

Maybe try another center support to see if you get a change. One part at a time.

Let me know.
Bruce
WE4
PTS XTREME

 

[blackplague]

Dave

If you want or need another center support, just call me at 586-255-3426. I have plenty and i'm not far from your place. Mike

 

[87GN_70GS]

I found this very same situation with my rebuild (teflon vs iron). Against advice, I went with iron rings. Shifted hard...hard enough to break the fwd drum shaft but that's another story.

 

[chris718]

solid teflon rings on the input shaft and forward drum should be considered mandatory.most times leaks when air checking the forward drum on the center support are caused by air escaping and entering the lube circuits where itll make noise.some is normal.high air pressure and air will leak.oil applies the clutch during transmission operation thereby REDUCING blow by inherent in the design.pack the rings with grease and re check .also make sure the check ball in the drum is not leaking.if the leaks continue place your finger over the other passages in the center support and then trace them.youll find most of this to be normal .however with the grease a 99 percent seal will usually be present.large bursts of air leakage indicates a problem in the center support sleeve where it is pressed into the support,or a damaged ring which is easy to spot.never use iron on the forward drum.on the center support to direct drum.........another story and im on the way out.