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Old 06-02-2014, 06:59 PM
Registered User
Join Date: May 2004
Location: Texas
Posts: 227
Timing gear replacement

In a previous posting I wrote about our adventure with a failing vacuum pump on a 1996 E300.

It took all day to learn the part number on the timing gear that runs the pump. The local Mercedes dealer could not find the part or number and after searching the net for too long finally called the Mercedes-Benz Classic Center. They call the part Injection timing device part number 605 070 06 45
None exist in the USA and just a handful in Germany, may get it next week.

The question is: What is the R&R procedure of the Timing gear? As it also controls the injection timing, am I in danger of throwing off the timing?
And can the job be done through the existing hole where the vacuum pump goes of do I need to remove the head?

Thanks for your consideration.

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Old 06-02-2014, 10:17 PM
Registered Hack
Join Date: Mar 2008
Posts: 4,617
The head does not need to come off, but the camshaft sprocket does.

You would do yourself a great favor by purchasing a simple MB tool to lock the injection pump in place.

You can work through the hole behind the vacuum pump.

You DO risk losing injection timing and crank to camshaft timing.

This is not the kind of procedure you explain in a few long posts. PM / email for a link to a manual.

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Old 06-11-2014, 12:15 AM
Registered User
Join Date: May 2004
Location: Texas
Posts: 227
Okay the injection timing device has arrived from Germany thanks to the Classic Center.
Timing gear replacement-dsc06711.jpg
and the locking pin to lock the injection timing.
Timing gear replacement-dsc06709.jpg
Now the cylinder head cover is off and ready to remove the camshaft sprocket.
Timing gear replacement-dsc06734.jpg
Now from what I've learned the camshaft sprocket and the injection timing device must be removed. 1st the crankshaft must be turned 14 degrees +0.5 degrees after TDC of cylinder 1.
Then the camshaft sprocket and injection timing sprocket must be marked with paint relative to the timing chain.
Then install the locking pin and remove the chain tensioner.
Then remove the cam sprocket (3 bolts and to install the bolts tighting to 18 Nm.) and timing sprocket by pushing the chain to the outside.
Now reassemble with the new part and after installation crank engine 1 revolution by hand and check TDC marking on crankshaft/camshaft.
Have I missed anything?
And do you have advice on what else should be done now that I am this deep in the engine? For example valve guides etc.
Thanks for your time.

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