Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-10-2016, 02:44 PM
Registered User
 
Join Date: Sep 2009
Location: college station, texas
Posts: 79
380SL engine konck

1981 380 SLC with 50K, Has been sitting in cc storage since I drove it on a 1000 mi car tour in Oct. When I started it today there is a loud knock which seems to be coming from the front drivers side rocker cover area. Where do I start? Thanks, Bob Smits

Reply With Quote
  #2  
Old 03-10-2016, 04:33 PM
Registered User
 
Join Date: Aug 2015
Posts: 67
Let engine warm up. If oil press is good rev at 2k for 30 seconds then let idle If noise is still there you might have a lifter that has failed.
Reply With Quote
  #3  
Old 03-12-2016, 06:20 AM
Registered User
 
Join Date: Sep 2009
Location: college station, texas
Posts: 79
Engine Knock

Thanks for the suggestion. Noise is still there. Time to pull it apart. Bob Smits
Reply With Quote
  #4  
Old 03-23-2016, 01:36 PM
Registered User
 
Join Date: Sep 2009
Location: college station, texas
Posts: 79
Engine Knock

Update; Engine knock did not go away after allowing engine to warm up. Pulled both valve covers and lifters are ok. loosened all belts and no change in knock. Timing chain and tensioners are good. Interestingly when I disconnect the flywheel RPM sensor and crank the engine without allowing it to start the knock is not there. Any help would be appreciated. I can text a 10 sec video to anyone who would like to listen to the engine knock. Thanks I really need help with diagnosing this problem. You can text me at 979 575 9371
Reply With Quote
  #5  
Old 03-28-2016, 12:52 PM
Registered User
 
Join Date: Sep 2009
Location: college station, texas
Posts: 79
380 SL engine Knock

HELP
Reply With Quote
  #6  
Old 03-30-2016, 12:11 PM
Registered User
 
Join Date: Mar 2003
Location: Southern California
Posts: 2,272
How did you determine the lifters are okay?

I experienced a collapsed lifter during warranty on my erstwhile '84 190E 2.3. I knew immediately what it was, but the dealer did the work.

With the valve covers off and the EZL disconnected, crank the engine, and it will crank faster if you remove the spark plugs. You should be able to spot a collasped lifter by eyeballing valve lifts as the engine cranks.

I would describe a collapsed lifter as more of a loud ticking sound rather than a knock.

Duke
Reply With Quote
  #7  
Old 04-05-2016, 01:29 PM
Registered User
 
Join Date: Aug 2015
Posts: 67
turn engine over by hand and feel for any loose rocker arms
Reply With Quote
  #8  
Old 02-27-2017, 01:49 PM
Registered User
 
Join Date: Sep 2009
Location: college station, texas
Posts: 79
Thank you to all who replied. Sorry for my absence but other health related matters tied me up for the past year. I just re-posted an update titled "motor Seized 1981 380SLC" Bob Smits

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 08:58 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page