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 ShopForum > Technical Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-09-2006, 01:25 AM
Registered User
 
Join Date: Feb 2005
Location: Denison, Texas
Posts: 290
Camshaft Timing

I was doing a valve adjustment tonight and was curious to how much my chain has streched in 310, 000 miles. I have lined the mark on the cam tower and sprocket and it looks like it is between the first ten and the first line before the second ten this is all to the left of the metal post on the crank looking down from the front of the car is this 12.5 degrees and what should it be ? Thanks for any input.
__________________
84 300 Turbo / 320,000
96 E300 D / 55,000
Reply With Quote
  #2  
Old 07-09-2006, 01:27 AM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Location: Windermere,FL
Posts: 13,205
that mark is just there for assembly purposes but some say it does give you a general idea
__________________

|1983 300D| OM617 239k Miles|Red|"Passion"|
|1982 300D Euro|OM617 NA| Thistle Green|"Granny Smith|
Reply With Quote
  #3  
Old 07-09-2006, 01:29 AM
Registered User
 
Join Date: Feb 2005
Location: Denison, Texas
Posts: 290
I know it is not a precise measurement I just wanted a rough idea how bad it has streched or if it is ok?
__________________
84 300 Turbo / 320,000
96 E300 D / 55,000
Reply With Quote
  #4  
Old 07-09-2006, 01:32 AM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by lakerat
I know it is not a precise measurement I just wanted a rough idea how bad it has streched or if it is ok?
For positive confirmation, take a photo and post it. It's difficult to determine what you have from the description.

If you do have 12.5 degrees ATDC, you probably should consider a Woodruff offset key to reduce this value. That's quite late.

A proper check should be done using the 2mm intake valve lift on #1 before you make any firm decisions. The procedure is in the DIY section.
Reply With Quote
  #5  
Old 07-09-2006, 01:35 AM
ForcedInduction
Guest
 
Posts: n/a
Quote:
Originally Posted by Brian Carlton
If you do have 12.5 degrees ATDC, you probably should consider a Woodruff offset key to reduce this value. That's quite late.
I would not chance anything with 8 or more degrees stretch. A chain job isn't that hard for a decent DIY-er. Just don't drop the chain...

I've got about 4* stretch on my engine. An offset cam key and injection timing adjusment got everything back to normal. (And gave me my favorite oil leak at the IP base...)

The last thread I want to here see is "My timing chain broke today"
Reply With Quote
  #6  
Old 07-09-2006, 01:40 AM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by ForcedInduction

The last thread I want to here see is "My timing chain broke today"
I've never seen anyone post a thread regarding a broken timing chain without some peripheral component, such as a slide rail or a tensioning rail fail and take out the chain.

Chains don't fail due to elongation.

However, I might agree that changing it is preferable due to the heavy loading of the first two or three teeth on the sprockets.
Reply With Quote
  #7  
Old 07-09-2006, 01:42 AM
Registered User
 
Join Date: Feb 2005
Location: Denison, Texas
Posts: 290
Can someone tell me how to upload a picture for this topic and I will go take a pictur of the mark.
__________________
84 300 Turbo / 320,000
96 E300 D / 55,000
Reply With Quote
  #8  
Old 07-09-2006, 01:44 AM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Just post a reply as usual.

Before submitting the reply, scroll down and hit the button that says "manage attachments."

You can then upload a photo that you have on your hard drive. The software will guide you through it. When finished, close the window and submit the reply. The photo will be in the post. Make sure the photo is smaller than 66K otherwise it won't display.
Reply With Quote
  #9  
Old 07-09-2006, 02:02 AM
Registered User
 
Join Date: Feb 2005
Location: Denison, Texas
Posts: 290
Here is the picture thanks for the help guys.
Attached Thumbnails
Camshaft Timing-dscn0863.jpg  
__________________
84 300 Turbo / 320,000
96 E300 D / 55,000
Reply With Quote
  #10  
Old 07-09-2006, 02:06 AM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by lakerat
Here is the picture thanks for the help guys.
Now, that's why we needed a photo.

You've got the cam timing at 2.5 ATDC. Nothing to concern yourself about and nothing needs to be done.
Reply With Quote
  #11  
Old 07-09-2006, 02:13 AM
Registered User
 
Join Date: Feb 2005
Location: Denison, Texas
Posts: 290
That is great news to here I bought this car at 62,000 at a dallas mercedes dealer and I have done all the maintenance and changed the oil every 2500 miles I was a little concerned my engine might explode because I am driving it 100 miles a day now to work. Thanks for the help
__________________
84 300 Turbo / 320,000
96 E300 D / 55,000
Reply With Quote
  #12  
Old 07-09-2006, 02:21 AM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by lakerat
That is great news to here I bought this car at 62,000 at a dallas mercedes dealer and I have done all the maintenance and changed the oil every 2500 miles I was a little concerned my engine might explode because I am driving it 100 miles a day now to work. Thanks for the help
At 302K, my concern is twofold:

1) The condition of the tensioning rail and slide rails

2) The condition of the tensioning spring for the oil pump and the oil pump chain drive.


Both of these items are in questionable condition at that mileage. A failure of either will likely take out the engine unless you are on top of it within seconds.......and.........even then the loss of the chain would take out all the valves and cam towers.

Naturally, there are engines that go 400K on the original hardware. But, some do not.
Reply With Quote
  #13  
Old 07-09-2006, 02:30 AM
Registered User
 
Join Date: Feb 2005
Location: Denison, Texas
Posts: 290
Brian are these items replaceable without major work?
__________________
84 300 Turbo / 320,000
96 E300 D / 55,000
Reply With Quote
  #14  
Old 07-09-2006, 02:41 AM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by lakerat
Brian are these items replaceable without major work?
Well, the tensioning rails and slide rails definitely require some serious work to remove. It's not a Saturday project.

I have not done the oil pump chain drive or the tensioning spring, but, I don't believe that it's too bad a job. The work is done from underneath, however.......not a lot of fun.

Jim Ellington (engatwork) has done a bunch of them, so, ask him for the tips if you decide to do the oil pump.

For the timing chain guides, you'll need the FSM for the proper step by step approach.
Reply With Quote
  #15  
Old 07-09-2006, 03:04 AM
bgkast's Avatar
Rollin' on 16s
 
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
Is there any way to check these items with out major disassembly?
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
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 09:17 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page