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Engine rattle behind timing cover

Ah hate to see this! If oil pressure is a suspect, it would be interesting to see what it's reading at 1k rpm when the rattle is present.

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Old 12-26-2023, 09:46 AM   #1 (permalink)
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Ah hate to see this! If oil pressure is a suspect, it would be interesting to see what it's reading at 1k rpm when the rattle is present.
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Old 12-30-2023, 03:11 PM   #2 (permalink)
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Turned out to be an idler pulley bearing. That would explain why there was no codes and the engine performance was fine.
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Old 12-30-2023, 04:16 PM   #3 (permalink)
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Turned out to be an idler pulley bearing. That would explain why there was no codes and the engine performance was fine.
You didn't check them when you did the galley gaskets? They would have been making noises then. At least it was something simple.
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Old 12-30-2023, 05:53 PM   #4 (permalink)
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I actually replaced all three when i was putting the front cover back on. My mistake was i didnt use OEm for the pulleys which i knew would bite me in the ***, and it did. Thats autozone quality for ya. Thankfully i went OEM with everything else it was just i needed them in a pinch and figured they wouldnt fail in two months…
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Old 12-30-2023, 09:00 PM   #5 (permalink)
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I actually replaced all three when i was putting the front cover back on. My mistake was i didnt use OEm for the pulleys which i knew would bite me in the ***, and it did. Thats autozone quality for ya. Thankfully i went OEM with everything else it was just i needed them in a pinch and figured they wouldnt fail in two months…
Ouch, Oh yeah that will get ya.
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Old 12-31-2023, 12:44 PM   #6 (permalink)
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I actually replaced all three when i was putting the front cover back on. My mistake was i didnt use OEm for the pulleys which i knew would bite me in the ***, and it did. Thats autozone quality for ya. Thankfully i went OEM with everything else it was just i needed them in a pinch and figured they wouldnt fail in two months…
Found out the same thing with my Murano. Except it was a name brand aftermarket kit, Dayco. First the belt ripped after 2 weeks and it took out one of the Idlers. Or other way around. bearing spins but squeeks
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Old 01-01-2024, 11:22 AM   #7 (permalink)
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Dayco was the brand i got too ironically…. It looked good because it seemed like it was machined well. But i guess the bearing is bad in those. Not sure what the supplier for bearings they use is but ill avoid them going forward.
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Old 01-01-2024, 01:53 PM   #8 (permalink)
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Dayco was the brand i got too ironically…. It looked good because it seemed like it was machined well. But i guess the bearing is bad in those. Not sure what the supplier for bearings they use is but ill avoid them going forward.
Ya, I used to alawys buy Gates over Dayco. Unfortunatley, at the time, Rock auto only sold Dayco for my vehicle.

Ironically, today, RA is once again selling Gates for my Murano and the dayco kit is removed.

So I'm wondering if there has been many returns to RA and there might be a Dayco manufacturing issue?
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Old 01-06-2024, 10:05 AM   #9 (permalink)
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Turned out to be an idler pulley bearing. That would explain why there was no codes and the engine performance was fine.
The worst, installing a new part that was a failure right out of the box. At least, you didn't have to dig back into the front cover.

As far as bearings, the vast majority are chinese junk. The nissan unit might even be chinese but with better QC. You can always pop it out and install a US sourced bearing or even ceramic but that's probably overkill unless running a supercharger.
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