After inspecting the wobbly pulley that came out of Captain RixRam's CRD when he did his TBelt work, it was all I needed to see to convince me that keeping the existing parts in, even if they look OK, just isn't worth it.
If it were me, I would have replaced the pulleys and tensioner when I had the chance. It's cheap insurance.
Pulleys and tensioners are rated for 100,000 or so miles, no more, and when ball bearings begin to deteriorate because of metal fatigue, it's only a matter of time before a total failure occurs.
It takes seconds when a totally failed pulley lets go for the belt to jump a few teeth and catastrophic engine failure occurs.
Captain RixRam's wobbly pulley didn't make an alerting noise for us to know that it was worn. You may never hear the pulley or tensioner making any noise or maybe you will if it's loud enough.... but do we really want to take that chance?
When it comes to maintaining our CRD's, I say do it right and don't xcrew around with the Tbelt work or the cooling system.
These are just my observations.
I mean come on, haven't we heard enough of CRD failures on here to take a chance with our own?
Hey, Racer: Just so you know, I most certainly did replace that tensioner as soon as it came in. All other pulleys were replaced during the T-belt change.
For the poster's question: don't screw around; Replace all the pulleys and tensioners. I've not replaced this engine, and I don't want to, as it is an expense close to $10K (from what I've heard). If you want to put your mechanic's kid through college, that is your business, though. Just my $0.02....
Tractor: '06 CRD Sport 4x4, GDE ECO-Tune & Trans Tune, Skyjacker 2.5" lift + 245/75r16 tires (Firestone ATs)
Silver Stallion: '06 CRD Limited. Currently replacing turbo, head gasket, adding ARP studs, replacing rockers and TB.
If you are in New England (or can get it to NE), and need a hand on your KJ CRD, let me know.