Possible rod bearing failure? HELP - weird rattling sound from engine bay

gor · 08-31-2020, 11:59 PM

Hi all, so I'm having some weird ticking sound coming from the engine bay. Not an expert mechanic by any means so I'm not entirely sure what it is. Here's a sound clip:

https://www.youtube.com/watch?v=-1p6...ature=youtu.be

The rattle increases with RPM's and can be heard only when I'm on the throttle. The sound disappears once I let off.

Recent updates with the car:
- AC sometimes gets really hot while I'm idling. When I get moving, the air blows ice cold again. This only happens sometimes.
- I just changed the oil and filter on the car using 5W-30 fully synthetic oil and a K&N filter. When I drained the oil, only about 2 quarts came out... This really worries me. (I just bought the car - drove it about 1500 miles before the oil change. It's at 95k miles)

I really hope this is not a rod bearing failure or something similar, but I'm thinking it might be. I've also got suggestions this could be an exhaust heat shield, but I have no clue. Any suggestions would be appreciated!

jchammond · 09-01-2020, 04:57 AM

Think positive, I know 2-quarts isn’t much out the pan

But noise sounds more like the fan clutch on A/C compressor.
Hopefully no engine failure & be sure to ck electric fans as well

SouthArk370Z · 09-01-2020, 09:25 AM

I'm with jchammond that it doesn't sound like a bad bearing. Bearings usually make more of a thunk, clunk, or knock. Pop the hood and see if you can identify where the noise is coming from - you can use a tube from a roll of paper towel or a piece of garden hose, with one end to your ear, to narrow down where the sound is coming. Be VERY careful when you have body parts or tools near rotating machinery.

gor · 09-01-2020, 05:39 PM

Sounds good, thanks guys. I’ll definitely check it soon. Considering my AC randomly stops working it could definitely be something related to that.

08-31-2020, 11:59 PM	#1 (permalink)
gor Base Member Join Date: Jul 2017 Location: Texas Posts: 7 Drives: 2009 Nissan 370z Rep Power: 8	Possible rod bearing failure? HELP - weird rattling sound from engine bay Hi all, so I'm having some weird ticking sound coming from the engine bay. Not an expert mechanic by any means so I'm not entirely sure what it is. Here's a sound clip: https://www.youtube.com/watch?v=-1p6...ature=youtu.be The rattle increases with RPM's and can be heard only when I'm on the throttle. The sound disappears once I let off. Recent updates with the car: - AC sometimes gets really hot while I'm idling. When I get moving, the air blows ice cold again. This only happens sometimes. - I just changed the oil and filter on the car using 5W-30 fully synthetic oil and a K&N filter. When I drained the oil, only about 2 quarts came out... This really worries me. (I just bought the car - drove it about 1500 miles before the oil change. It's at 95k miles) I really hope this is not a rod bearing failure or something similar, but I'm thinking it might be. I've also got suggestions this could be an exhaust heat shield, but I have no clue. Any suggestions would be appreciated!

09-01-2020, 04:57 AM	#2 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684394	Think positive, I know 2-quarts isn’t much out the pan But noise sounds more like the fan clutch on A/C compressor. Hopefully no engine failure & be sure to ck electric fans as well SouthArk370Z, JARblue and old guy like this. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

09-01-2020, 09:25 AM	#3 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	I'm with jchammond that it doesn't sound like a bad bearing. Bearings usually make more of a thunk, clunk, or knock. Pop the hood and see if you can identify where the noise is coming from - you can use a tube from a roll of paper towel or a piece of garden hose, with one end to your ear, to narrow down where the sound is coming. Be VERY careful when you have body parts or tools near rotating machinery. Ghostvette and BettyZ like this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Weird screeching sound from.engine bay	SS_Firehawk	Nissan 370Z Warranty / Scheduled Maintenance / Servicing / Repairs	0	06-28-2017 02:38 PM
Rattling sound coming from engine?	georgem71	Engine & Drivetrain	2	11-16-2015 06:40 PM
Wheel Spacer and Bearing Failure	40 to 332	Wheels & Tires	3	01-06-2014 10:17 PM
Did I lose a wheel bearing or heat shield rattling?	cossie1600	Brakes & Suspension	5	09-13-2013 09:05 AM
Transmission noise (sound like bearing failure)	ronstoppable	Engine & Drivetrain	31	09-12-2013 05:01 PM

09-01-2020, 05:39 PM	#4 (permalink)
gor Base Member Join Date: Jul 2017 Location: Texas Posts: 7 Drives: 2009 Nissan 370z Rep Power: 8	Sounds good, thanks guys. I’ll definitely check it soon. Considering my AC randomly stops working it could definitely be something related to that.