How to Install a Throw Out Bearing

Installing a throw out bearing correctly can be a time consuming task. As much as we would like to be able to just come to your shop and help you do that, we can't. So instead, we decided to share a helpful video from Ram Clutches that shows you how to properly install your throw out bearing. In addition to the video we decided to trouble-shoot a few frequently asked questions/problems instead of boring you by repeating the entire video in this article.

If you follow the video step-by-step you should not have any issues but if you decide to skip a couple of tedious steps you can run into some technical problems. One of the problems could be having too much bearing clearance. This can cause the clutch to not disengage or the bearing to bottom out on the snap ring, which could over pressurize the seals and cause leakage/premature failure. On the other end of the spectrum, you could have too little bearing clearance. This can be a problem as the clutch wears; the fingers get taller and will eventually bottom out against the bearing. This will cause the clutch to unload/slip as it can't apply its full pressure.

Another question often asked is when to use a round face bearing versus a flat face bearing. Round face bearings are used for smaller diameter, multi-disc clutches and flat faced bearings are for stock style clutches. If you notice that your bearing is leaking it could be caused by a couple of things. The use of synthetic (DOT5) fluid can cause the seals to swell and eventually leak. If you are using the correct fluid, petroleum based fluid (DOT 3 or 4); it could be the simple fact that your bearing needs to be rebuilt. Replacement seal kits are available so that you can rebuild your throw out bearing without having to go and purchase a whole new setup. And last but not least, you MUST use Teflon tape when installing the fittings.

When purchasing a new bearing, two items need to be purchased to complete the install. This would include a -3AN Teflon feed line of appropriate length for your application and a ¾" bore clutch master cylinder with at least 1.2" of travel. This size master cylinder should provide about .500" of bearing travel. Most throw out bearings come with a bleeder but purchasing a remote bleeder kit will make this task a lot easier. The kit will provide you with extra-long lines that will allow you to bleed your throw out bearing from the outside of the bell housing, making it more accessible.

Mike Norcia at Ram Clutches stated "The biggest mistake I see made is not measuring or measuring properly for setup. As one of your guys said to me once in a seminar, "You can't set these up with a wooden yard stick." Taking the extra time to measure, re-measure, and then do it one more time can save big headaches down the road." Hopefully this little tidbit of information will save you some time and trouble. If you have any questions feel free to give us a call and we would be happy to help.