HOW DO I TIME MY TIMING MARKS

I suggest you revisit the valve timing and start by obtaining the valve timing data in text or diagram form.
Using the flywheel is more convenient than messing around with degree discs or protractors. Dividing 360 degrees by the number of ring gear teeth will tell you how many degrees apart each tooth is and after accurately finding and marking tdc and bdc (bottom dead centre) it will be simple to turn the crankshaft to the intake valve opening point of so many degrees after tdc or before bdc as applicable.
Guesstimating the position as accurately as possible if it falls between two teeth is important. Next move the camshaft until the number 1 intake valve is exactly at the point of beginning to move.
With a single cam that is the point to fit the timing belt ensuring the slack part is on the tensioner side. If the teeth don't align exactly, fit it to the nearest alignment. If it is exactly half a tooth out it is best to opt for the advanced setting so belt and pulley wear in service will move the timing closer to the ideal. An adjustable pulley is available for some engines...

Finding tdc accurately requires a dial indicator but feeling the number one piston through the spark plug hole with a rod, if done carefully can be very accurate. The piston is moved to a little before tdc. It should be noted there is a few degrees of crankshaft movement where there is no appreciable piston movement. By experimentally rocking the crankshaft find the point before tdc and after tdc where piston movement starts and ends Mark each on the rod and tdc is midway between them...

The best way to begin would be to find and accurately mark TDC. This is only possible by using a dial indicator on top of the timing cylinder (usually but not always No 1). Access to the piston top can often be achieved by removing the injector and a few engines have a facility to attach a probe for timing purposes.

Once there is an accurate TDC mark the next thing is to measure the circumference of the flywheel and calculate and mark the exact distance BTDC of 3 degrees.
Measuring the flywheel is not an option if the engine is installed but counting the teeth of the flywheel ring gear is a suitable second option and it is fairly easy to calculate how many degrees apart each tooth is...

I think the M130 engine uses a timing chain. To get you timing marks set up correctly you mignt have to take the top rocker cover off to see the Cam timing marks. The Crank should be set up to the centre 'OT' mark for Top Dead Centre, (TDC). there is a set of numbered marks either side of it. The pulley is marked for both Top Dead Centre and Bottom Dead Centre, (BDC). Being a Mercedes the marks are in German. OT for TDC and UT for BDC.

if you know where the timing marks are supposed to be the use the old method of cam/crank timing to check and adjust to where the marks will be. Remove no 1 injector and turn the engine over until no 1 piston is coming up on injection stop when you reach TDC. mark on flywheel of harmonic balancer. If there is valve clearance ot both rockers turn the engine another 180 degrees and bring the piston to TDC again. watch the rockers and if you turn back a few degrees or turn forward a few degrees you will see ( in the forward direction) the exhaust valve closing and at the same time the inlet valve will be opening. This is known as valve rock. As you move the piston bacvk and forward over TDC you will see the valve movement. set on TDC and check the timing marks with the positions indicated. Remove and reposition the cam shaft gear to achieve the correct mark alignment or pull the cam shaft out just enough to realign the teeth to the mark. At the most you will be about 1 tooth out. The pump timing will be out 180 degrees as you are setting the valve timing on the induction stroke and you will need to turn the engine 180 degrees to compression stroke for the pump timing marks to line up. the injection mark on the flywheel is what you are looking for and when it is at the correct number of degrees as indicated by injection / lightning flash sign then the marks for the pump should be just about lined up

6 degrees before TDC

use top dead center TDC

The engine timing markers down on the harmonic balancer/crankshaft pulley should be aligned with the timing indicator on the engine block to "0" degrees when the engine is in the compression stroke for the #1 cylinder, and this is TDC or "Top Dead Center". When something blows out of the spark plug hole that only means that the piston is coming up on TDC, but the crankshaft will still have to be turned until the timing markers are at "0" degrees. You should be sure that you do know how to properly align the timing marks to "0" degrees, and the timing marks must be set at "0" degrees before the distributor can successfully be installed.

Be certain that the timing marks are set at "0" degrees and on the compression stroke for the #1 cylinder, or the timing will be 180 degrees off when you install the distributor. This has to be precise and guessing will not get the distributor properly clocked in so that the ignition timing can be correctly set.

Once you are certain that the timing is set to "0" degrees "TDC", then mark the distributor housing where the #1 position on the distributor cap will be when the cap is installed on the distributor, so that the distributor housing shows a reference mark where the #1 position is, then the distributor should be installed so that the ignition rotor is pointing directly at the #1 position on the distributor housing, or just before the #1 position mark according to the rotation of the ignition rotor. The distributor should be able to turn and point the ignition rotor on either side of the #1 position mark to provide plenty of timing advance or ****** so that the ignition timing can properly be adjusted to specifications after the engine has been started.

Be sure that you follow the proper timing procedure for that vehicle and remove any timing spout connectors that are described in the set timing procedures

Also, be certain that you are actually using the #1 cylinder to set the engine to TDC and to actually time the engine with a timing light. Here is a firing order diagram that should also help to assist you. Let me know if you require any further assistance.

Fig. 1: At 90 degrees past TDC, the crankshaft sprocket timing mark and keyway will align with the main bearing cap split line.




Fig. Insert the timing pin to ensure that the camshaft is at No. 1 TDC-SOHC engine




Fig. : When the camshaft is at TDC, rotate the crankshaft counterclockwise 90 degrees to achieve TDC




Fig.: Insert the timing pins to verify that the camshafts are at TDC




Fig. : Make sure that the silver link plates and reference marks are all in alignment as shown


Hope help with this (remember comment and rated this).

Try this:

this is for the crank pulley timing marks .....