Clutch suddenly not disengaging after high revs

[mirageman]

That's a tough one. If I were you, I would try to find a part of the bell housing from underneath the car that I could drill a hole big enough for a cheap borescope from Harbor Freight and take a peek in there while someone steps on the clutch. Problem is I don't think you have Harborfreight in your part of the world. After determining the cause through that hole, I'd simply tap it and put a bolt in it or just find a tight fitting bolt and with oil, go a little bit in, little bit out, a little bit further in, and back and forth until you make your own threads..... Drilling from underneath will prevent any shavings from falling into your bell. You just have to determine where you can drill safely.

As for the real cause, we know your clutch isn't disengaging, so you're looking at either a bad throw out bearing, bad pressure plate or bad slave cylinder. I am unfamiliar with the concentric slave cylinder mechanism, sorry... but I don't know how it can feel normal if it is not disengaging your clutch. Is it perhaps something that can somehow break from it's attachment and move AWAY from the pressure plate instead of pushing against it? (Like a person pushing against a wall and feet sliding backwards.)

Be real careful where you think you might drill! :-)

[zimmer]

Originally Posted by mirageman

That's a tough one. If I were you, I would try to find a part of the bell housing from underneath the car that I could drill a hole big enough for a cheap borescope from Harbor Freight and take a peek in there while someone steps on the clutch. Problem is I don't think you have Harborfreight in your part of the world. After determining the cause through that hole, I'd simply tap it and put a bolt in it or just find a tight fitting bolt and with oil, go a little bit in, little bit out, a little bit further in, and back and forth until you make your own threads..... Drilling from underneath will prevent any shavings from falling into your bell. You just have to determine where you can drill safely.

As for the real cause, we know your clutch isn't disengaging, so you're looking at either a bad throw out bearing, bad pressure plate or bad slave cylinder. I am unfamiliar with the concentric slave cylinder mechanism, sorry... but I don't know how it can feel normal if it is not disengaging your clutch. Is it perhaps something that can somehow break from it's attachment and move AWAY from the pressure plate instead of pushing against it? (Like a person pushing against a wall and feet sliding backwards.)

Be real careful where you think you might drill! :-)

My buddy got this incoming Yaris project with an intermittent clutch issue. The previous owner mentioned his son tried to replace the slave cylinder. We'll just finish installing the suspension and dually wheels on the Superduty this week. Gonna check out the bearing and slave cylinder first.