unhealthy engine sound

2012 HYUNDAI ELANTRA
85,000 MILES • 1.8L • 4 CYL • 2WD • AUTOMATIC
Avatar
MAMUKA78
  • MEMBER
  • 5 POSTS
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
Aug 12, 2019 at 11:37 AM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Good afternoon,

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

Roy
Aug 12, 2019 at 1:20 PM
Avatar
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.
Aug 12, 2019 at 1:43 PM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 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
Aug 12, 2019 at 1:47 PM
Avatar
MAMUKA78
  • MEMBER
  • 5 POSTS
Rod bearings mean VANOS? with regards to pressure oil is not checked, tomorrow I'll go check.
Image (Click to enlarge)
Attached Media
Aug 12, 2019 at 1:54 PM
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Okay, keep me updated with the results.

Roy
Aug 12, 2019 at 2:05 PM
Avatar
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.
Aug 23, 2019 at 12:40 PM
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Did you check the actual oil pressure?

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

Roy
Aug 23, 2019 at 12:51 PM
Avatar
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.
Aug 23, 2019 at 1:01 PM
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
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
Aug 23, 2019 at 1:16 PM