clutch/throw out bearing Qu's

[blurr1604]

A high pitched squeaking noise comes from the gearbox when in neutral and when in gear at low speeds i can hear, as i reach higher speeds it is drowned out.

when i even rest my foot on the clutch an inch or so the noise goes away, also when clutch fully depressed it is still not there,

i believe this is due to the throw out bearing?
correct me if im wrong

so my question is,

if the bearing is to be replaced does the clutch have to be?

and if the clutch is replaced does the flywheel need machined?

any other things to consider?? like the rear main seal

thanks in advance ! i've never touched the gearbox/clutch area before


cheers,
blair

 

[KLF]

Yup, that sounds like a classic case of a bad throwout bearing to me.

Assuming the bearing was replaced the last time the clutch was, they generally wear out at about the same rate, so you'll probably find it just about worn out. It's a lot of work to get the tranny out, so I would be prepared to replace the clutch too.

I generally always have the flywheel cut, you'll probably find it to be pretty polished and that can cause issues with a new clutch. It will be a huge timesaver if you can get ahold of a spare one, have it machined ahead of time, so no down time.

My opinion: Always always always replace the RMS when you do a clutch job. You're there, so do it. Even if it's not leaking... yet.

 

[blurr1604]

thanks for your advice mate, was not what i wanted to hear though, seems like this will be a costly excercise

thanks again

 

[UpsideDown]

Your noise is probably being caused by the release bearing. As the clutch is self-adjusting, the release bearing will wear a little more quickly than on an non self-adjusting set up.

The noise may not mean that the bearing needs to be replaced in a hurry. The bearing may actually be pretty good, but due to the nature of the release/slave cylinder applying light pressure against the bearing, some noise may happen between the interface of the bearing and the surface of the clutch mechanism (on the fingers of the diaphragm of the clutch).

If you're going to be taking it apart, it's a good idea to check the clutch and replace it if it's worn. The pilot bearing and release bearing should always be replaced.

The rear main seal is optional - and in my experience - are not a common source of oil leaks in these diesel engines as they typically operate at reasonable temperatures and turn quite slowly.

I see more rear main seal or rear main seal housing issues on higher revving gas engines that use O-rings to seal the seal housing to the engine. Let age and mileage be an indicator of whether or not replacement is necessary (if the valve cover gasket or other engine gaskets or seals are dry, cracked, or leaking, then you should install a new rear main seal). On the other side of the argument, the seal is relatively inexpensive and is not too difficult to replace but there is some liability in doing so... if not installed correctly it may leak, and you'll have to get in there again and install another one.

If you're replacing the clutch, then machine the flywheel just enough to clean the surfaces up.

~John

 

[blurr1604]

thanks for your help, it has 166,000kms on it