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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-07-2004, 11:54 AM
coachgeo's Avatar
Registered User
 
Join Date: Jan 2003
Location: TX between Dallas and OK
Posts: 1,793
Talking Im a Zero..... well sorta (chain stretch)

Doing a quck view of my timing chain stretch via the line up the marks method.

The knife blade is on zero. NO not the mark prior to zero but dead center on the actual "0" stamped on the pully.

There appears to be a line mark that is just to one side of the zero and before the pin. I'm guessing this is the actual zero mark. If Im understanding that correct, then I have approx. 1 degree of chain stretch?

here is what I have the "i" is line stamped into the pully. The "v" is where my knife blade sits, and the "p" is where the pin is. "10" and "0" are also stamped into the pully


.......v........
1i0 i 0i p

ok.... lets see if this word pic gets chopped up by this forum

Again...... is this about 1 degree of chain stretch?
__________________
"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way".
by JerryBro


The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue

My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair

62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels

Last edited by coachgeo; 04-07-2004 at 02:56 PM.
Reply With Quote
  #2  
Old 04-07-2004, 03:33 PM
Rick Miley's Avatar
Spark Free
 
Join Date: Jun 1999
Location: Land O Lakes, FL
Posts: 3,086
Please see the post by stevebfl at the end of this thread: click

My interpretation of Steve's post is that the marks at the cam are not precision marks. So you cannot use them to judge chain wear.
__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References
Reply With Quote
  #3  
Old 04-07-2004, 05:54 PM
coachgeo's Avatar
Registered User
 
Join Date: Jan 2003
Location: TX between Dallas and OK
Posts: 1,793
read it

Quote:
Originally posted by Rick Miley
Please see the post by stevebfl at the end of this thread: click

My interpretation of Steve's post is that the marks at the cam are not precision marks. So you cannot use them to judge chain wear.
I read it before posting my question. I should word my question better.

Does the marks as they show in my case dictate that further investigation w/dial indicator etc. is neccissary? Orrrr does it seem to show that the estimation I got; using the Mark Method, is in a range that says no further digging into it is really neccissary?
__________________
"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way".
by JerryBro


The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue

My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair

62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels
Reply With Quote
  #4  
Old 04-07-2004, 07:17 PM
ForcedInduction
Guest
 
Posts: n/a
I would repeat the steps at least 4 times to get a good range of what it can be. I got 2-3-1-2 when I aligned the marks after installing the offset woodruff key in the cam.
Reply With Quote
  #5  
Old 04-07-2004, 09:43 PM
coachgeo's Avatar
Registered User
 
Join Date: Jan 2003
Location: TX between Dallas and OK
Posts: 1,793
Quote:
Originally posted by 82-300td
I would repeat the steps at least 4 times to get a good range of what it can be. I got 2-3-1-2 when I aligned the marks after installing the offset woodruff key in the cam.
hmmmmm... but does even that range of numbers tell you that a more true measure should be taken. I'm thinking no? If the avg. was 3 then Yeah.
__________________
"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way".
by JerryBro


The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue

My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair

62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels
Reply With Quote
  #6  
Old 04-08-2004, 09:16 AM
Rick Miley's Avatar
Spark Free
 
Join Date: Jun 1999
Location: Land O Lakes, FL
Posts: 3,086
Quote:
Originally posted by coachgeo
Does the marks as they show in my case dictate that further investigation w/dial indicator etc. is neccissary?
Leathermang and I had a discussion about this offline, as he in favor of doing it the factory manual (dial indicator) way only. I initially took your position, that if your marks are close enough then you're fine. But if the marks are more then a couple degrees, you should investigate further.

The manual says to use the dial indicator method, and makes no mention of the "line up the marks" method, so we don't have a concrete reason of why lining up the marks doesn't work. So no positive proof against it leads us to believe that lining up the marks works fine. However, I have a different opinion after reading Steve's comments in the thread linked above. As I said above, the marks at the cam are apparently not precision marks, so you really can't make any judgement, either good or bad, from them.

I think Marshall Booth and gsxr have both written about this in the past, so it should would be nice if they would weigh in here.
__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References
Reply With Quote
  #7  
Old 04-08-2004, 12:45 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
This thread was pointed out to me and I am sitting for the moment digging info for two shop problems.

I didn't go to the link so I don't know exactly what I said, but in this context I will give my impression. I will usually at this stage of my experience not worry about cam timing unless the chain has over 100k on it. In my position now I am more likely to put in a new chain than to measure. I believe the mark at the camstand is sufficient to decide how to place the gear on the chain and that is all.

Dial indication would be the only means of effectively measuring stretch. Since a large part of the loss of timing also comes from the gears which are likely to not to be changed, the only way to deal with it is to measure and correct with offset keys or replace the chain and ignor the last few degrees. It has been a long time but I am under the impression that a motor with miles and a new chain will be anywhere from 4-7 degrees retarded due to other worn parts (gears and tentioning rails)
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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 05:06 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page