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  #1  
Old 05-11-2021, 09:00 PM
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Chain guides failure | Possible Mad Max fix ?s

Quick question - has anybody successfully driven or attempted a "Mad Max style" fix with broken timing chain guides?
  • Pull Valve Covers and Lower Oil pan - fetch out as much of the plastic bits
  • Install new tensioner
  • Send it

I'm considering this style of a "Mad Max" to my wife's x5 as it suffered chain guide failure this morning at first start-up. Unit has 197K miles and is simply not worth a full repair - multiple systems are beginning to fail. I'm wondering if I would always have a VANOS timing code

Anybody attempt this style of a fix?

Thank in advance,


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  #2  
Old 05-12-2021, 01:34 AM
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Wow, I have never heard of this fix. PLEASE DO NOT do this fix. Because if the main plastic guide failed the metal chain will rub on the U shaped metal guide under the plastic. Lots of metal shavings and carnage will ensue. This will also come with a loud tractor motor metal on metal sound. If there is just a rattle when you start the engine it could be the tensioner and VANOS seal system failing. The problem running the engine with this failure is the chain slaps on the plastic guides on every start and will shred the plastic and cause the first problem I mentioned.

I have replaced all of these problems on my X5 4.4i and she is good to go for another 200K miles.

Good luck
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  #3  
Old 05-12-2021, 01:55 AM
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Actually I've done two M62tu chain guides jobs and only the one that actually derailed and broke the chain really had any significant metal wear.

The bigger problem is that the chain is immediately too long once the plastic is gone and can no longer be tensioned so it snowballs very quickly. In addition since that slack is mostly from the u shaped middle guide, that means bank two will advance relative to bank one.

There is a lot of no good going on.

In a deserted island, modifying the tensioner to take out the slack and re-time the engine with the "longer" chain, it would probably run 20-30,000 miles. Steel to aluminum is not a terrible bearing surface with pressurized oil film. Consider the millions of miles the chain goes over that PLASTIC guide!

Steel > aluminum > wood > plastic > bone > skin.

Aluminum is plenty strong enough but the combination of the loose slapping chain that prevents the oil film from lubrication. It won't last long at all.
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Old 05-12-2021, 01:58 AM
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Update: it is only 6/10 difficulty job to do chain guides. Takes me about a week working 5-6 hrs a day. Slow and steady pace. It is a very rewarding thing to bring a beautiful engine back from then grave.
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Old 05-12-2021, 05:49 PM
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Thank you all for your responses. I'm most likely going to sell the unit to a local salvage yard. Steering rack is on it's way out as well and the sunroof is kaput.

I already have an e38 in the garage with chain guides being addressed at about 65% completion so I know the scope of work. I work two jobs that are extremely time intensive, kids, yadda, yadda, etc. Really it comes down to time. I'm afraid I'll be chasing my tail for the remainder of ownership.

-k
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Old 05-12-2021, 06:18 PM
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why don't you sell it to someone who will fix it and not just scrap it?
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Old 05-12-2021, 08:31 PM
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Chain guides failure | Possible Mad Max fix ?s

Quote:
Originally Posted by x5Alpine View Post
why don't you sell it to someone who will fix it and not just scrap it?


Id be happy to sell it locally to somebody. Anybody in Denver area is welcome to pm me.


Couple pics just for grins.


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Old 05-12-2021, 09:40 PM
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Quote:
Originally Posted by x5Alpine View Post
why don't you sell it to someone who will fix it and not just scrap it?

Right? There are literally dozens of us
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Old 05-12-2021, 11:17 PM
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Quote:
Originally Posted by Bdc101 View Post
Right? There are literally dozens of us


PM me if interested.

FYI The current high bid is the salvage yard. Due to this inflation mess ......they are willing to pick it up for 750.00.


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Old 05-13-2021, 08:37 AM
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Just swap in an LS1 and be done with it.

https://ls1tech.com/forums/conversio...-x5-4-8is.html

The third comment in my link said it all.
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