Quote:
Originally Posted by 8lueM3
Quote:
Originally Posted by tdott
Who told you the rod bearings were changed? A used car dealer, or previous private seller? or do you have an invoice showing it was done? There are many cases of sellers lying.
Pretty certain that is rod knock. The AC compressor can make a similar sound, so it doesn't hurt to remove the AC belt and confirm the knock is still there. From there you would need to remove the pan and inspect the rod bearings and decide what you want to do from there.
IMO to fix it proper, you want a good crank as any attempted fix to the current one isn't going to be reliable long term. If it's rod knock then for sure the crank is scored.
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tdott Used car dealer. I don't have the documentation nearby atm, it's in my car parked in a closed garage 5 mins away, but IIRC, I don't remember me looking for the Rod Bearing replacement documentation... I'd have to check it, when I'm off from work I'll take a look!
I don't think it's the AC belt to be honest, the sound seems to be coming from the left side of the engine, and IIRC the belt is on the front, lower areas...
> IMO to fix it proper, you want a good crank
That's what I was hoping for really, a good crankshaft (£1.5k) + new RB (£500) + new engine oil (£100) + oil filter (£50) is a big difference than having an entire engine replaced/rebuilt.
I don't really see how my engine is marked as "Totaled" for my mechanic, the engine still switches up, runs "fine" (haven't driven her ever since my mechanic told me the news, only to get her back to my garage), has the rod knock, but at the end of the day, my point of view is that:
1. The metallic flakes in the oil and oil filter aren't "massive", I've seen way worse when looking for these symptoms. New engine oil + new rod bearings + new engine oil filter should perhaps do the job?
2. As the car still runs OK, I'd say that the issues are still fairly limited to the rod bearings and most likely the crankshaft as well. Therefore, new crankshaft.
I will probably take her to a different mechanic for inspection. Probably not even from a BMW dealer, as I'm sure they'd go for the most expensive path just for their sake. |
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tdott said, dealerships lie ALL the time, especially a used one. Find the paperwork if you can and verify if possible.
Flakes in oil certainly sound like a rod bearing issue, but your mechanic is a fucking moron without at least suggesting to drop the pan and remove one or two rod caps. He's either lazy, doesn't know what he's talking about, or a combination of the two. Go to a different mechanic because that's straight deceptive to just say "ROD BEARINGS, NEW ENGINE" without first diagnosing root cause.
Also, don't skip on maintenance like coils/injectors; if you were having issues you should have replaced them instantly so shame on you for possibly exacerbating this issue. Without proper spark or fuel, you can wipe/wash cylinders and cause scoring damage!
Get a second opinion from someone who cares because it sounds like your mechanic can't be bothered to for your sake.
-Duke