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Originally Posted by CleanIsFast
Nice progress so far! Amazing that guide piece was just laying there
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I'm guessing it got thrown up there by the chain.
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Originally Posted by X53Jay4.8is
There is no need to worry unless you start to hear some type of sound. If you have leaks on the engine at the timing cover then this is a gold time to have the work done or at least inspect the guides. Even if they are in tact they do get brittle and then tend to break. Again if your vehicle is absolutely quiet then don't worry about it at this time.
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Exactly.
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Originally Posted by V8 00USH
My 4.6is is on 120k miles and I'm already starting to have nightmares about the guides - I've got zero service history but the engine is absolutely silent on startup and when running so hopefully I should be ok until I have time to tackle it.
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If everything is quite and proper otherwise then I wouldn't worry about it. The guides give you plenty of warning, you'd have to be super negligent to actually wreck your engine.
Quote:
Originally Posted by V8 00USH
It's the brittle issue that I'm more worried about - almost a silent killer.
Lot's of horror stories of them failing at 90k+ over in the UK with zero warning.
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The horror stories are the minority, I'd say most M62tu's have a pretty good chance of going past 150k miles on original guides.
Quote:
Originally Posted by X53Jay4.8is
Here are my $.02 cents when it comes to M62 engines. In all of my M62 equipped BMWs when even ever I got to the point of resealing the timing covers I have always gone in and replaced the guides and chain for future piece of mind. My X5 started to exhibit a whirring sound at 99K miles and I thought it was one of the tensioners or bearings on the alternator, ac compressor and come to find out it was the beginning of guide failure. I like to have piece of mind that where ever I drive my BMWs they are mechanically sound. I could have gone a few more thousands of miles before changing them but I was already half way in there. The guides are gonna fail and I much rather be proactive then reactive to the situation when it occurs. This is a known concern with the M62 engines in the BMW X5.
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Yeah, that's how I ended up doing the guides on the Range Rover, I had the timing covers off and decided to go all the way. If you're comfortable doing your own work then it's pretty easy to take care of the guides, but if you have to budget like $3000+ for a shop then that certainly makes it a lot scarier.