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09-23-2023, 09:08 PM | #23 | |
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09-23-2023, 11:11 PM | #24 |
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But the vanos units themselves were not replaced?
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09-24-2023, 11:17 AM | #26 |
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Are codes thrown while it is running? It is possible they are damaged internally from metal debris.
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09-24-2023, 06:43 PM | #28 |
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09-24-2023, 06:52 PM | #29 |
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It might be a moot point; if you've run metal through those vanos units, they're fuct. I don't know any variable valve timing system that plays nice with metal swarf. I don't know any mechanic that recommends reusing a block that has had forbidden glitter come out of it. Does this make sense?
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09-24-2023, 06:58 PM | #30 |
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If you're looking for a mechanical reason why it won't time up, there are vanes inside the vanos units. If there is enough metal in the vanes/pockets to prevent them from moving to the correct position when you set timing, that could cause slack in the chain and timing errors in ISTA. As for clacking, it could be broken vanes in the vanos unit or a spun rod bearing from having aluminum run through the oil.
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09-24-2023, 06:59 PM | #31 | |
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09-24-2023, 07:05 PM | #32 |
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I hope I’m wrong about this but if you haven’t completely flushed the block, oil pan, changed the oil cooler and rebuilt/flushed the heads to remove all the chewed up aluminum in that engine, your friend is just pissing in the wind. That engine is a boat anchor.
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09-24-2023, 08:06 PM | #34 |
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I think the lead may have been buried a bit. This motor had aluminum vanos caps that became detached, chewed up into little pieces and sent aluminum bits all over the inside of the timing covers and thus through the engine. The owner then attempted to just replace vanos related components EXCEPT for the actual vanos gears and install bolt on caps without throughly cleaning the engine thinking there wouldn’t be aluminum in the oiling system. Am I missing anything?
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09-24-2023, 11:19 PM | #35 |
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To the OP,
Has the mechanic confirmed the timing was done correctly? Are you able to set the tool flush? If not, its most likely due to debris in Vanos gears. I had trouble timing recently also and following deansbimmer recommendation to change out the Vanos gear solved the issue. Problem is, I think the Vanos gear for exhaust side is out of stock everywhere lol |
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09-25-2023, 06:23 PM | #36 | |
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09-25-2023, 06:26 PM | #37 | |
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09-26-2023, 08:34 AM | #38 |
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Popped by to the mech today. As of right now, they've reinstalled the chain more than 10 times. Each time following TIS procedures to the letter. Bank 1 chain is always loose. They have swapped tensioners, and even VANOS gears left to right and the chain slack is always on Bank 1. The only thing they didn't swap yet are the cams.
This is what it sounds like now. Zero errors. |
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10-27-2023, 07:57 PM | #39 |
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Update - Problem solved. That amount of chain slack on Bank 1 is normal. There was nothing wrong with the entire chain assembly.
The noise was caused by a bad valve lifter. The mech replaced it and sound is gone. |
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