Engine Knock
Thread Starter
Newbie
Joined: Mar 2009
Posts: 14
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e320
Engine Knock
My 2001 e320 has a knocking from the engine. The knocking speeds up when accelerating. I have checked oil level, which is fine. Also had an oil change 2 months ago with no initial signs of knocking, leading me to believe it is not from oil or filter. I did have a catalytic converter installed recently. Any suggestions?
Super Member
Joined: Jun 2008
Posts: 835
Likes: 2
From: Bay Area, CA
09' E320
Present in P & N basically rules out driveline/flex disks, etc. Removing belt (and running 30 secs only - no waterprump) confirms whether or not noise is accessory related.
Realistically, it doesn't sound like you will be the one to repair it if pulling the belt is difficult. Should prob let a mechanic hear and diagnose it.
Realistically, it doesn't sound like you will be the one to repair it if pulling the belt is difficult. Should prob let a mechanic hear and diagnose it.
Last edited by TMAllison; Mar 18, 2009 at 06:18 PM.
Junior Member
Joined: Oct 2008
Posts: 64
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From: Orlando, FL
97 E320, 04 C230K, 06 R500
You said that recently had a catalytic converter installed............try checking to see if they my have bent the pipe and now its tapping the under carriage?? ………won’t hurt to look!
That’s the only thing that has changed, and has not been looked at!
Good luck to ya!
That’s the only thing that has changed, and has not been looked at!
Good luck to ya!
Thread Starter
Newbie
Joined: Mar 2009
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e320
Converter
Thanks. I will check to see if the pipe is bent. From what I understood, lifters tend to quiet after running for awhile? This tapping/knock does not go away, even after running for hours. Also does not go away with higher speeds. Never thought to check the pipe. I will do that. Thanks again!
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MBWorld Fanatic!
Joined: Nov 2001
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From: Philadelphia area
2010 ML550, 2010 E350 4M, 1966 Corvette Convt C2
Valve noise would be like a tap not a knock. With a knock if the frequency increases with the rpm it is likely to be a main or rod bearing. This is unusual unless the car has extremely high mileage and you did not mention the miles. In any case this ciuld be quite serious and should be looked at by a dealer or other experienced party BEFORE the car is driven any further. If you continue to run the car there is the distinct possibilty that it will let go damaging the block and that means an entire new engine with no core allowance while if it is not too late the engine could be salvaged.
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Thread Starter
Newbie
Joined: Mar 2009
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e320
It actually does sound more like a tapping. The car has 110,000 miles. Find it very odd that the sound occurred after having a new catalytic converter installed. Plan on checking the pipes, just curious if it could be valve related. It is a constant tapping. Very annoying.
Newbie
Joined: Apr 2009
Posts: 9
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From: Orange County
Stock for now E420
Valve noise would be like a tap not a knock. With a knock if the frequency increases with the rpm it is likely to be a main or rod bearing. This is unusual unless the car has extremely high mileage and you did not mention the miles. In any case this ciuld be quite serious and should be looked at by a dealer or other experienced party BEFORE the car is driven any further. If you continue to run the car there is the distinct possibilty that it will let go damaging the block and that means an entire new engine with no core allowance while if it is not too late the engine could be salvaged.
Last edited by ItalianGuy714; Apr 2, 2009 at 01:28 PM.
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From: mAsSaChUsEtTs
1997 Mercedes-Benz E420
the E420 "tick tick tick" is due to the infamous m119's plastic oil guides that pop off from poor oil change intervals or after wear and tear over the mileage, DIY is on mercedes wiki: http://www.mercedesshop.com/Wikka/M119OilGuides
that DIY applies to the m119 (4.2 liter V8 as well) with the parts from autohauz and the time to DIY you can save thousands with this DIY compared to dealer or indy doing this
I will be doing this soon..
that DIY applies to the m119 (4.2 liter V8 as well) with the parts from autohauz and the time to DIY you can save thousands with this DIY compared to dealer or indy doing this
I will be doing this soon..
