Quote:
Originally Posted by rice_classic
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Well I took my tranny out and replaced my TOB last weekend. It was shot, it made noise just spinning it by hand and when I looked at the distances of things when bolting the tranny back to the engine I'm pretty confident the TOB does not engage the PP in its resting position. I would need Ultramaroon to definitively prove otherwise because my own eyes did see that as a reality.
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Well, @
Ultramaroon ....... you're up ......
@
rice_classic I thought the same as you until @
Ultramaroon convinced me differently.
It's now my understanding that prior to about 1985, the clutch systems were set up such that the TOB did NOT rotate, until the clutch pedal was pushed down.
Then about the time hydrolytic clutches came along, "they" figured it was better to have the TOB in constant contact with the fingers of the pressure plate (with a pre-load of a few pounds of pressure).
I scrapped this off the Internet (so you just know it's true ......
), but it sounded pretty good to me:
"I did a lot of reading on the TOB when I was setting up my clutch. Even found some posts from an engineer who works for a bearing mfr. The throw out bearing used by our cars [ miata ]was designed for constant contact. It is meant to constantly spin. The stress from a bearing going from a standstill to full spin is much harder on the bearing and reduces lifespan. Stock factory setups can last for hundreds of thousands of kms, mine did. Guys setting them up with no pre-load constantly complain of short lifespans. There was a time that no pre-load on the TOB was how it should be setup, that’s why the clutch forks came with springs to make sure the bearing came away from the fingers."
humfrz