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Stacy Farist
Stacy Farist,
Category: Mercedes
Satisfied Customers: 36
Experience:  Lead Mechanic at NTB
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Mercedes 2003 c240 v6. Need step by step instructions on

Customer Question

Mercedes 2003 c240 v6. Need step by step instructions on removing and installing head. I'm replacing gead gaskets. Need instruction on how to remove chain. And if I need to turn the engine to some marks etc. Please I need simple to understand instruction . With images of possible
Submitted: 3 months ago.
Category: Mercedes
Expert:  Chad Farhat replied 3 months ago.

Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be posting a reply ASAP

Expert:  Chad Farhat replied 3 months ago.

2003 Mercedes Benz C 240 4MATIC Sedan (203.081) V6-2.6L (112.916)

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Replace Timing Chain

1 Disconnect ground cable of battery CAUTION: - Do not connect quiescent current retention device otherwise this may cause damage to the control module. 2 Remove spark plugs NOTE: To ensure that the engine can be easily cranked when drawing in the timing chain, and to avoid the timing chain jumping across. Remove only once spark plug of each cylinder. 3 Remove cylinder head covers - Air cleaner mounted on vehicle - Air cleaner positioned at engine side 4.1 Remove fan shroud NOTE: Not Model 211.061/065/070, 230.475 4.2 Remove electric fan 5 Position engine to 40 degrees after TDC of first cylinder. NOTE: - Engine must not be cranked backwards. - The notches of the camshafts must point toward the inner V. - It must be possible to easily insert the two locking plates. If this is not possible, Set the basic position of camshafts. - The copper plates of the timing chain must be aligned with the scribe marks on the camshaft sprockets. - Owing to the unevenly long paths of the timing chain it may be necessary to crank the engine as many as 14 times till the copper plates get aligned with the scribe marks on the camshaft

sprockets. - On vehicles equipped with an air pump, the combination valve must be unbolted before the right locking plate is inserted. - Installation: Replace Gasket of combination valve. 6 Remove chain tensioner 7 Remove camshaft position sensor 8 Crank engine in direction of rotation until the link for separating the timing chain is easily accessible NOTE: Timing chain is separated one chain link next to the copper plate (on right). See new timing chain. 9 Remove camshaft bearing bridge on right 10 Install holding bush (3) onto camshaft on right NOTE: Screw in bolts (4) only until they touch. 11 Attach retaining devices (1, 2) for timing chain to right and left cylinder head 12 Separate timing chain CAUTION: Cover over timing case recess with a clean cloth. Parts which have dropped into the timing case recess, must be removed. NOTE: To pull out the old timing chain, connect the old chain to the new timing chain. Install 13 Draw in new timing chain NOTE: To draw in the new timing chain, crank engine in direction of rotation at the crankshaft. 14 Remove retaining devices (1, 2) for timing chain at right and left cylinder head 15 Rivet new timing chain

16 Crank engine in direction of rotation 17 Check timing of engine 18 Take off holding bush (3) on right camshaft 19 Install camshaft bearing bridge on right 20 Install camshaft position sensor 21 Installing chain tensioner 22.1Install fan shroud NOTE: Not Model 211.061/065/070, 230.475. 22.2Install electric fan 23 Install cylinder head covers - Air cleaner mounted on vehicle. - Air cleaner positioned at engine side. 24 Install spark plugs 25 Connect ground cable DANGER: - Risk of accident from vehicle starting off by itself when engine running. Risk of injury as working around the engine during startup or while running may result in contusions and burns - Secure vehicle to prevent it from moving. - Wear closed and tight-fitting work clothes. - Do not grasp hot or rotating parts. 26 Run engine and inspect for leaks.

Expert:  Chad Farhat replied 3 months ago.

2003 Mercedes Benz C 240 4MATIC Sedan (203.081) V6-2.6L (112.916)

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General notes on timing, markings

The four copper plates of the timing chain facilitate the assembly when putting on timing chain. Each copper plate (1) must be matched with one of the markings (camshafts 4/ 5, balance shaft 3 (M 112) or guide wheel 3 (M 113) and crankshaft 2). Due to unequal length of timing chain paths, the engine must be cranked up to 14 times, until the copper plates are matched again with the markings.

Expert:  Chad Farhat replied 3 months ago.

2003 Mercedes Benz C 240 4MATIC Sedan (203.081) V6-2.6L (112.916)

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Screw diagram for timing case cover

Expert:  Chad Farhat replied 3 months ago.

2003 Mercedes Benz C 240 4MATIC Sedan (203.081) V6-2.6L (112.916)

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Remove/Install Chain Tensioner

1.1 Remove fan shroud (2) together with electric fan 1.2 Remove electric fan 2 Remove generator (G2) NOTE: On generator (G2) only unscrew upper bolt, slacken lower bolt. Only move generator away. 3 Take chain tensioner (6) off timing case cover(5) NOTE: Installation: Replace seal (7). 4 Install in the reverse order.

Expert:  Chad Farhat replied 3 months ago.

You will need special tools to perform this job

Hope that twill work for you

Let me know if you need anything else on it just reply back and we will continue

if you are good , Please Kindly rate me.

Hope I was helpful to you

A Positive Rating is Much Appreciated

This Post Will Stay Open for You To Come back and Ask me Any Follow Up Question You May have on this issue , even after you rate me

Thank You

Chad Farhat
ASE Certified Technician

Customer: replied 3 months ago.
I didn't quite get any of it. Because I need to know where should I start . I took of valve cover etc. See pictures.
Expert:  Chad Farhat replied 3 months ago.

I will open up the question for you for another expert maybe they have better directions & diagrams , I m sorry that is all I have on it for timing chain.

Customer: replied 3 months ago.
I'm not replacing only the chain I'm doing head hasket. So need start to finish instruction.
Expert:  Stacy Farist replied 3 months ago.

Hi thaanks for using justanswer.com. Like the Tech before me said this job does take special tools. Not to insult so dont take it the wrong way. Its not a job for novice. Here are the instructions that Mercedes has released.

Expert:  Stacy Farist replied 3 months ago.

Timing Marks

Expert:  Stacy Farist replied 3 months ago.

Are you there?

Expert:  Stacy Farist replied 3 months ago.

If you have any questions on these steps. Let me know. I will be on and off for another hour.

Customer: replied 3 months ago.
I have replaced heads on ford pickups never did mercedes . But these instructions look pretty cool. I'll review these instructions and go from there.
Expert:  Stacy Farist replied 3 months ago.
Sounds good
Expert:  Stacy Farist replied 3 months ago.

Just checking in to see if you needed anything else? If I was of some assistance please accept and rate as this is how we are credited. If you need any further assistance let me know. Thank you.