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#31
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#32
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Check the lower vanos solenoid on my n62 the timining chain has gone bad and eaten upp the solenoid. Dont ask how this is possible... p0021 error code and missfire on random cyl.
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#33
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I've been informed people for years to replace your chain tensioner regularly else this sort of thing will happen.
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2011 E70 N55 (me) 2012 E70 N63 (wife) |
#34
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Sent from my SM-A730F using Tapatalk
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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course |
#35
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Now I have to replace both timing chains guides one solenoid etc... |
#36
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The only reason I can see is that the chain has strechted or some of the links broke. Perhaps as previous post wrote that the tensioner gone bad but I canīt se how.
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#37
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N62 misfire
Chains don't really stretch. A 180,000 mile chain from an M62 I measured about 8-10mm longer than new (less than 1/2%).
Tensioner loses tension allows the chain to slap around. It's how the M62 chain takes out the guides. The N62 has one piece guides that are more robust and much shorter chains using two vs one. I haven't looked into the exact geometry to explain the example above but usually the chain won't start "chain sawing" through the engine until the tensioner stops working and enough slap builds in the chain to tear out the guide and then the free slip of the chain becomes inches vs mm.
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2011 E70 N55 (me) 2012 E70 N63 (wife) Last edited by andrewwynn; 05-06-2020 at 11:16 AM. |
#38
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When itīs time to do som work on it I will find the fault and let you all know. |
#39
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N62 misfire
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Tensioner will stop providing tension. At this point the chain gets loose and "whips" think of a bull whip but made out of steel and pushed by unlimited force of the momentum of a V8 engine! Pretty bad to fail so quick: was the tensioner OEM? I've seen non OEM I sent right back because the design didn't even LOOK similar no way it would function the same. After that one example and helping rebuild several engines that had internal destruction I would never use a non OEM tensioner. I'm not familiar with the geometry of the N62 but did the chain "derail" and jump off track of the guides to get onto the solenoid? There is no chance the chain from N62 is 2cm longer than new. The apparent extra length comes from guides getting chewed though usually. In rare occasion that will be followed by the chain actually coming off a toothed sprocket. At this point usually very quickly chews through the chain covers, a jam and breaks the chain and some bent valves. Oh: loss of oil pressure due to low on or pump failure will cause loss of chain tension also.
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2011 E70 N55 (me) 2012 E70 N63 (wife) Last edited by andrewwynn; 05-06-2020 at 12:21 PM. |
#40
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On the m62 the chain can get longer if it chew up the guides, but on the n62 I dont know. It has not "derailed" because it ran just fine except from chains rattling and out of spec on the timing (kinda obvious) and a bit rough idle, I checked vanos solenoid to start with because they could get clogged and found that issue with chain chewing threw the solenoid. Getting my hands on the car this weekend to inspect what has happened. Hopefully something easy but I think I have to replace chains, guides, tensioner etc... |
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