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#1
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Chain guides failure | Possible Mad Max fix ?s
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, P.S. I have my flame suit on for those that Now my username is finally appropriate |
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#2
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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 |
#3
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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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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#4
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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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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#5
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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 |
#6
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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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#7
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Chain guides failure | Possible Mad Max fix ?s
Quote:
I’d be happy to sell it locally to somebody. Anybody in Denver area is welcome to pm me. Couple pics just for grins. Sent from my iPhone using Tapatalk |
#8
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Quote:
Right? There are literally dozens of us
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2003 3.0 5MT Topasblau Purchased in 2016 and surprisingly still running |
#9
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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. Sent from my iPhone using Tapatalk |
#10
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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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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
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