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

LinkBack Thread Tools Display Modes
Old 02-02-2001, 07:09 PM
Posts: n/a
Does anyone know the correct timing for a 1988420SEL. Also is that for the Car in Drive or neutral. Thanks!

Reply With Quote
Old 02-02-2001, 08:27 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
These engines do not have an adjustment. The distributor is adjustable, but it will not affect the timing in any way. The timing is set off of the crank sensor. If you move the distributor, you will make things worse, not better because you will be opening the rotor gap.
Donnie Drummonds
Reply With Quote
Old 02-02-2001, 08:31 PM
Registered User
Join Date: Jul 2000
Location: Toronto, CANADA
Posts: 1,193
I have heard that it is possible to check for chain stretch in these cars (420SELs - mine is an 86) by measuring how far off the cam timing is. How is this done? Is it hard, and can my mechanic do it quickly. I am curious because I know chains in these engines need to be replaced every 100,000 miles. I'm past 180,000 now, and although I have no record of a chain change in the records that came with the car I'm sure it must have been done. I am just wondering how much longer before I need to change it. Also, if the timing is retarded due to chain stretch, what kind of other benefits will I see, other than avoiding a major catastrophy (better mileage, more power?).
Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired
Reply With Quote
Old 02-03-2001, 05:40 PM
Posts: n/a
No Timing

Thanks for your answer Benzmac! However need to know the Ga Gap spacing. Had to change waterpump and of course that means lifting up the Distributor to get to the bolt. It may be off a little. Any help? Thanks,

Reply With Quote
Old 02-03-2001, 06:20 PM
Registered User
Join Date: Jul 2000
Location: Sunny Florida
Posts: 199
420SEL, (Jason), in reply to your question about timing chain stretch:

Remove both valve covers and rotate the engine until the crank pointer is on '0'. Observe the timing marks on each camshaft, and their relation to the mark on each cam bearing tower. If all is well, the marks will be aligned. The stretch in the chain will be illustrated by the misalignment of these marks.

I would worry more about the plastic rails in the heads than the chain. These fail from exposure to heat in the engine, and become brittle. They break and fall between the timing chain and the crankshaft sprocket, causing the engine to jump time. Pistons hitting valves, cats and dogs living together, its all bad! I changed my guide rails and chain at 125K miles and thought I had cheated fate long enough! At 180k, I would be thinking about it seriously.

In response to what improvements in engine performance: I thought mine ran smoother afterward, but that may be my imagination, as we all like to think after a weekend under the hood things are ALWAYS much better! But I did not have much stretch observed before the job.

Do a search on timing chain, and chain guides. There is plenty of info on that here.
My $.02 worth on this.
Good luck!

1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)
Reply With Quote


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
E420 M119 Timing Chain- Here's my story bobjohnston Tech Help 29 01-24-2010 11:23 PM
Not getting full timing advance on 230TE. M102 CEC Tech Help 0 07-13-2003 10:43 PM
FS: New Timing Chain/rails/tensioner +more 84 190E 2.3 Herr Leber Tech Help 0 12-17-2002 03:01 PM
What are the limits on Timing Chain Stretch? Steve A Tech Help 2 07-10-2001 10:54 AM

All times are GMT -4. The time now is 01:28 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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