Throw out bearing always makes contact?

[lovehamr]

Stallion112, I gotta ask, cause I'm ignant', how can we tell the difference?

Steve

[strictlypersonl]

Stallion,

Thanks! That was quite enlightening.

I checked a couple of our typical TO bearings here:

RAM 486 (Weber 16042) for Big-spline Toploader: Floating face

Fed. Mogul 614038, Small-spline TL and Tremec: Floating face

That would imply both should be used with zero clearance...

[patrickt]

Originally Posted by strictlypersonl

Fed. Mogul 614038, Small-spline TL and Tremec: Floating face

That would imply both should be used with zero clearance...

I don't know. I remember this thread from the Classic Bronco forum with some great shots of 614038 TOB that was in constant contact with the clutch fingers. http://classicbroncos.com/forums/sho...d.php?t=143086

[Excaliber]

This from the Ram web site regarding setting up the 4800 series throw out bearing:

If the proper release gap is not attained, you must remove the bellhousing, disconnect the hydraulic lines, loosen the set screw and turn the bearing cylinder in or out until the proper release gap and/or air gap is found. This may take several tries, but take the time now to get it right!

Instructions for my recently installed Ram clutch specified .250 clearance. That setup is the classic external slave hydraulic application, like most ERA's run. Implied isn't good enough for me. I want to know specifically what the manufacturer of the throw out bearing itself specifies. Clutch finger clearance, or not.

[mpanten]

Originally Posted by Excaliber

This from the Ram web site regarding setting up the 4800 series throw out bearing:



Instructions for my recently installed Ram clutch specified .250 clearance. That setup is the classic external slave hydraulic application, like most ERA's run. Implied isn't good enough for me. I want to know specifically what the manufacturer of the throw out bearing itself specifies. Clutch finger clearance, or not.

I think the clutch manfacturer's and slave manafactures need to get together. There is no way and I mean no way I can have .250 clearence and still get enough throw to disengage the clutch. I have tried for weeks and and spent countless hours. Maybe it's beacuse im running a twin disc and it needs more throw than a single disc but I can say with complete confidence that in my case it aint happening

[Excaliber]

Thats a good point about the cltuch vs the throw out bearing supplier. The final specification would HAVE to come from the throw out bearing manufacturer because only HE knows what style your using!

If it's made in China, all bets are off.

Twin disc is a different animal all right. Depth of the input shaft is critical, for instance. The trans throw out bearing collar may even need to be modified by grinding away a portion of it external base to allow for more travel of the throw out bearing.

Some throw out bearings do use a bearing assembly just like a front wheel bearing, tapered roller bearings. Other use ball bearings. It should be obvious which style you could run zero clearance with, or not.

[mpanten]

I would soon as cut my right arm off rather than take that transmission out again If I get a few years out of this set up I will be happy. I almost went back to the hydraulic throw out set up.

[Excaliber]

Ha Ha, man I hear that. I've had my trans out SO many times I'm almost burned out. One time was to replace, wait for it, a bad throw out bearing which had been running with zero clearance and burned up. That took about 7,000 miles.

[mpanten]

Im hopeing it will be ok for a few years. My bearing spins but it is not really under a load if that makes sense. 7000 miles gets me 3 or 4 years and I can live with that.

[Excaliber]

Interesting post there Pat. Thats exactly what MY throw out and clutch fingers looked like after about 7,000 miles. The Bronco guy got me beat though, he made it to 8,000.

I just got an email response to my question for the Ram technical division. The Ram 486 throw out bearing for a big block Ford specifies a .250 clearance.

[strictlypersonl]

0.25" clearance! They are certainly covering their butts with that one. That translates to about 1.5" at the pedal, not including other clearances.