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 02-08-2015, 08:17 PM
BenzHeartYota's Avatar
Registered User
Join Date: Oct 2014
Location: Central Texas
Posts: 5
Setting the timing 617.952 HELP!!!!

I need help from the experts,
Here is the background. I am putting my engine into my toyota. The engine came from a junkyard 85 300D. It had quite a bit of leaks so I was going to replace the seals and clean her up. Now I am stuck because I was an idiot thinking that this diesel rebuild would be like my gas engine. I pulled the timing chain and pulled the head off. I am working to reinstall the timing chain and head but I don't know how to set timing properly.
Do I just line the timing marks up on the cam and IP with the crank and call it good? I have read something about it should be set to 24 degrees BTDC. Is that set by lining the marks or do I line the marks and have to adjust something else? This is my first diesel and so far I am not getting a good run at it. I really appreciate everything and have already learned so much from this forum.
Reply With Quote
Old 02-08-2015, 08:28 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,032
You need to line up the marks on the crank/cam and then set the ip timing. Go to for manuals.
Reply With Quote
Old 02-16-2015, 10:24 PM
Join Date: Dec 2005
Location: Northern,Ca
Posts: 715
Did you remove the timing chain completely?

84 280sl
82 300d euro
Reply With Quote
Old 02-17-2015, 05:24 AM
Stretch's Avatar a shield of steel
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,370
Generally speaking if you are wanting advice about diesel engines then you are best off asking in the Diesel section (DD) of this forum. Some of us migrate between DD and tech help - some don't.

First step - go to as engatwork says and click on MB workshop resources then CD/DVD to find the W123 manual.

Second step - although this isn't written in the book my advice is to fit the head (new gasket needed!) and fit the camshaft and the camshaft towers.

This is the point where ideally you should be fitting a new timing chain. (IWIS brand)

If you are going to fit the old chain the procedure is a little bit more complicated if you have lost your place.


Camshaft tower has a mark - crank set at TDC on cylinder #1

Fit the new chain and camshaft sprocket before fitting the rocker arms / camshaft followers to give you time to know that you have the valve training timing correctly set. You can rotate the crank (ONLY clockwise direction when standing in front of the engine looking at it) to your heart's content safe in the knowledge that valves will not be hitting pistons. Check the TDC and camshaft mark. Don't forget the effect of the tensioner!


If you are fitting a used chain you essentially do the same as above but as a last check you need to perform the 2mm lift check and fit an offset key to bring the camshaft timing back into the correct position. You will need to fit the first set of camshaft followers to allow this test to be performed. On a seiously elongated timing chain you could get piston and valve interference if you are unlucky. This is a potentially dodgy process to perform!

If you have lost your place with a used chain you are best off getting a new one.

Third step - you now need to set "begin of delivery" on the injection pump so the fuel gets added to the cylinders at the correct time.
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior

Don't leave that there - I'll take it to bits!
Reply With Quote
Old 02-17-2015, 01:49 PM
Lucas's Avatar
Registered User
Join Date: Sep 2014
Location: Santa Barbara, CA
Posts: 1,202
Always put some white out on the chain and sprockets. However, I just removed the head and left the chain. There's a chance of the timing gear slipping a link, and I did not want my valves to interface with the Pistons. So I didn't mark it, lined them up, then checked my IP timing.

To answer your question vaguely, line the marks and then adjust something else. the IP drops in with a mark to line up with tdc. The holes are elongated to allow it to rotate after and set the timing. Drip timing is somewhat non scientific and an art, so take your time and relax. If you haven't removed the IP, it may be on point.

Being a novice to this motor, and seeing it happen before, make sure your balancer is on right with the head off. Goto TDC and look to make sure #1 is at the top. It can happen.

On my motor there are pins on the balancer to place it. The ones mercedes sells now days are 4mm too long, and if you install them they can slip and eat the crank or split and rotate the balancer.

Like they said. Check valve timing with chain stretch. Probably buy a new chain and guides if you are in there.

A thing that surprised me (as a novice), the rocker arms go on the head after the chain and tensioner are in. That way you can roll around and slip them in.

If the heads off, you might want to have the machine shop take a look. For my 4 cylinder, it was only $225 in labor and $60 for all new guides. Unnecessary, only the exhaust showed wear.

If you do guides, turbo motors get brass and NA gets steel.
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

All times are GMT -4. The time now is 10:09 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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