Wow, another 100km thread!

[Bobby^]

Anyhoo down to business.

The usual 100km service, done all my fluids recently but am going to get cambelt and others changed and water pump. My question is, in amny other threads people say you should do your "idle bearing". What exactly is the idle bearing? what will happen if it breaks, and how much more will it cost rather than having it done at 100kms?

Thanks guys.

[R32 4 Door]

It is a wise move to replace the Idler and Tensioner Bearings at 100,000km. They may only be a little bit noisey but in another 100,000km they could potentially become seized which is very bad news as the belt will then break and as a result bent valves will occur.

[benl1981]

My bearings were pretty average. I replaced the tensioner bearing and idler bearing. I bought as whole pulley with the bearing inside. Under $100 for the 2.

My water pump seemed fine and my crank and cam seals weren't leaking so I left them. Some say you should replace crank and cam seals but I couldn't be bothered taking the rocker cover off and the camshaft pulleys. Also I thought a few less things to get wrong the first time I did a belt change.

I did the most important things. If there was any sign of oil around crank or cam seals it is wise to do them. If you take it to a shop I would get everything done as it costs $ if down the track something needs doing, whereas If you do it yourself you will just kick yourself for the wasted 3-4 hours...

Torque up idler bolt and tensioner nut to correct torque.

Also if oil does leak from crank and cam seals it will shorten the life of your belt possibly without you knowing.