Off-Road Forums & Discussion Groups

Off-Road Forums & Discussion Groups (https://forums.off-road.com/forum.php)
-   GM Standard IFS Trucks & SUV's (https://forums.off-road.com/gm-standard-ifs-trucks-suvs/)
-   -   Engine noise: What is it? (https://forums.off-road.com/gm-standard-ifs-trucks-suvs/305601-engine-noise-what.html)

bowtie4by 01-05-2018 08:48 PM

Engine noise: What is it?
 
I have a noise in my engine. The sound resembles a wood drumstick lightly tapping the side of the snare. It disappears when I increase revs to 2000 (from idle approx 500). Is it hydraulic tappet? Is it cam chain? Is it piston skirt slap? I've heard a crank-shaft plain bearing go bad but it is not that deep, solid, or hard of a hit. I don't know about con-rod bearing, but I imagine they are similar. There is no loss in power, nor ease of increasing rpm. Any ideas? Oil is Mobil 1 Delvac (Turbo-Diesel-Truck) 5W-40. Used since breakin was completed. It is mostly PAO. Centistokes at 100/40*C are 97.87/14.5.

bowtie4by 02-27-2018 01:00 PM

Oil and results
 
I added 1 qt of Mobil 1 High Mileage 10-40 (M1HM1040) and the noise subsided to almost nothing. I am thinking cam-chain. Does anyone know where I can find info on GM V-8 5.3 cam-chain.?

bowtie4by 10-10-2018 06:12 PM

5.3 valve adjustment
 
I'm fairly certain that the noise is valve clatter.
Is it possible to adjust the 5.3 valve lash?
I can't find anything about it.


All times are GMT -5. The time now is 06:04 PM.

Powered by vBulletin® Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright 1994-2009, VerticalScope Inc. // Off Road forums & discussion groups sitemap
side by side | atv | dirtbike | snowmobile | sandsport | competition | land use | Jeep | Toyota | Ford | GM

 
For the best viewing experience please update your browser to Google Chrome