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Q: Timing chain guides on 1999 BMW 740iL

My 1999 740il has failed timing chain guides. Do I need to replace the timing chain at the same time ? Also was wondering if I can do without disassembling engine that far ? any other warnings would be greatly appreciated.
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If the guides are worn, and they're being replaced, then you'll have the front of the engine apart and you might as well rplace the chain too.
If you are going to even think about performing this repair, get a high quality repair manual, try these:
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