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Unhealthy engine sound

Tiny
MAMUKA78
  • MEMBER
  • 2012 HYUNDAI ELANTRA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
Hello. Two months ago I inserted bushing in the cylinders due to scuffing, changed the engine pistons to a new one. after this for the first ignition i did not like the sound of car, and is now much worse. What's that sound, what could it be?
Car from the US, Hyundai Elantra MD 2012, 1.8 DOCH G4NB. before repair 5w20 oil poured shell and after repair 5W40.
I have video and please listen the sound of engine.

https://youtu.be/lqgND_z6Qms
https://youtu.be/wchPef93tUU
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Monday, August 12th, 2019 AT 11:37 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Sounds like valve train noise. You have a much heavier knock if it was a piston or bearing.

Roy
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Monday, August 12th, 2019 AT 1:20 PM
Tiny
MAMUKA78
  • MEMBER
  • 5 POSTS
Hello Roy. Thanks for the reply, the noise as in the first video is not always, but as in the second video every morning. Pay attention to the first few seconds start with a bang and then the sound changes dramatically when you first start gives the vibration, shaking.
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Monday, August 12th, 2019 AT 1:43 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, I heard that. That could be an oil pump or worn main and rod bearings.

There should be no noise at all.

Did you check the actual oil pressure?

Roy
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Monday, August 12th, 2019 AT 1:47 PM
Tiny
MAMUKA78
  • MEMBER
  • 5 POSTS
Rod bearings mean VANOS? With regards to pressure oil is not checked, tomorrow I'll go check.
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Monday, August 12th, 2019 AT 1:54 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, keep me updated with the results.

Roy
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Monday, August 12th, 2019 AT 2:05 PM
Tiny
MAMUKA78
  • MEMBER
  • 5 POSTS
Hello. Today changed the oil pump cover. The sound of the first 3 seconds after the start is again present, and then normal. I suspect that UTB gear of the VANOS.
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Friday, August 23rd, 2019 AT 12:40 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you check the actual oil pressure?

It is possible but worn bearing will do the same thing.

Roy
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Friday, August 23rd, 2019 AT 12:51 PM
Tiny
MAMUKA78
  • MEMBER
  • 5 POSTS
No, I didn't, but when they removed the lid, they also removed the pump and disassembled it. The pump was defective and worn, and worn places. In the morning on a cold engine more listen to how to start.
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Friday, August 23rd, 2019 AT 1:01 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, you need to check the oil pressure.

I want to help but I need information. I see all you did but I need the oil pressure readings.

Roy
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Friday, August 23rd, 2019 AT 1:16 PM

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