Reply With QuoteIt’s a tapping noise… though it could almost be a sparking type noise too, given alternator is involved.
Master
SupporterI’ve taken the cowl off and had a listen. It’s coming from the left side of the engine as I look at it (so the tensioner/ alternator side). The fan isn’t touching anything.
I’m think i’ll need to run the engine with no fan on, is this OK?
Can I run the engine with no belt (for a very short period), or just turn it over by hand?
Cheers, Sam
Master
SupporterIt’s a tapping noise… though it could almost be a sparking type noise too, given alternator is involved.
ChatterBox
SubscriberYou won't do any harm running without the belt for the 30 seconds or so that it will take to determine if the noise goes away. Especially if you do it with the engine cold (assuming the noise is present when cold?).Originally Posted by Samblers
Master
SupporterYep i'll do that. Noise is there from cold, yes.
Difficult to say wether it disappears when driving, obviously the engine noise drowns out all else
Master
SupporterTook my fan off and ran it... looks like my tensioner is jumping around.
Slo-mo vid here (had to slow it down to capture):
IMG 2467 - YouTube
The pulley above it (idler of some kind) has a bearing that is a little loose, so I guess i'll replace both these components
Master
SupporterDone a little bit of reading on this now and sense I might be disappearing down a worm hole...
- should the belt tensioner being jumping up and down at idle like this? some say yes, some say no (I'm saying no)
- what would make it jump up and down like this? presume some cyclical tension on/off or low/high in the belt... but from what?
- some say to check harmonic balancer... how? it spins fine... in fact all pulleys feel like they are spinning ok, with no rough bearings
Cheers, Sam
Master
SupporterMine jumps like that still (far worse when the bearing in it had gone) but I don't think it's a major issue. May also be cyclical loading/unloading of the engine itself ticking over not 100% sure.
Either way don't think that is what is going to hurt it.
Take the belt off, run it cold. If you get no ticking you know it's related to one of the accessories and can start running through those.
Do the pulleys on the alternator and AC compressor wiggle at all etc.
Turbo heatshield above was also a good suggestion, though when mine cracked it made a rattling noise pretty consistently so I just got rid of it.
Master
SupporterHmm.
Run with the belt off there's no noise. None of the accessory pulleys have grumbling bearings, though have a little end-play. Don't know if thats normal.
To be honest, the tapping/ clacking sound i'm hearing could well be a pulley in/out/endplay sort of a sound... if something were causing the belt to flap/move.
I guess tensioner is the first thing I'll change out, to rule it out.
On our D1 back a few years there was a ticking sound which turned out to be a faulty pulley affecting a belt. Replacing the pulley stopped the ticking.
ChatterBox
SubscriberI think your noise sounded more like something coming loose than a bad bearing. Have you checked all the bolts on things like the alternator, a/c compressor etc?
What does the belt look like?
BTW, you can replace the bearing in the belt tensioner, it has to be done carefully to not warp the pressed-metal pulley. Replacing the fan bearing is a pain of a job, the big plate across the front of the engine has to be removed. LR don't offer the bearing as a separate part- they want to sell you the whole front casting, around $700 several years ago when I did mine. The dual-row roller bearing is about $50
I wasn't aware these engines had a harmonic balancer; if that is the case, does the bottom pulley run true when you idle the engine?
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