Anyone have access to WIS? - PeachParts Mercedes-Benz Forum

mb911 · #1 05-04-2017, 12:01 AM

Does anyone have access to Mercedes WIS? I need to look up the procedure for replacing the intake and exhaust camshaft adjusters on a 2012 C250 sport sedan (W204) and any preceding steps. Unfortunately very little information is online about it. I know it is an involved job but do not know which parts I will need to order nor if I will need any special tools.

If anybody can help out a Mercedes brother it would be greatly appreciated!

joshuajeeper · #2 05-05-2017, 09:34 AM

I would need a VIN to get you the correct parts list (there is an engine number break point).

Special tools needed: Cam locking tool (W271-589-00-61-00) & adjuster center bolt socket (W271-589-00-10-00)

Step 1: Install fender covers and disconnect battery.
Step 2: Remove intake pipe assembly from air filter to turbo charger and remove power steering reservoir.
Step 3: Loosen P/S reservoir bracket to cylinder head (do not remove, only loosen) and remove coolant pipe & breather hose that run along the passenger side of the cylinder head cover.
Step 4: Remove ignition coils and cylinder head cover. Rotate engine to ignition TDC and install camshaft holding tool.
Step 5: Remove alternator to access chain tensioner. Remove chain tensioner cover plug from timing cover and remove chain tensioner (replace tensioner, do not reuse).
Step 6: Remove thermostat & cylinder head front cover and clean surface with Loctite 7200 (A010-989-90-71) and surface prep spray Loctite 7063 (A001-986-71-71-10). Do not use sharp or rough objects to clean surface, use chemical spray to prevent damage to sealing surface.
Step 7: Remove centering bolts and replace camshaft adjusters (recommend to replace one at a time to keep the timing chain in place.
Step 8: Reseal front cover and reassemble vehicle.
Step 9: Replace engine oil and filter. Fill & bleed cooling and power steering system. Inspect for leaks and function test repair.

Hope that helps!

mb911 · #3 05-08-2017, 10:12 PM

Thank you for the very informative reply! I have PM'd the VIN.

Too bad I just replaced the thermostat - probably 30% of the work already done there.

I see you are a master tech - do you see a lot of these W204 C250s in for camshaft adjuster replacement? The car in question has 100k miles and sounds like a diesel on startup which the dealership diagnosed as faulty camshaft adjusters. They were happy replace them for a cool $4,370!

How long would this job take for a competent tech such as yourself?

joshuajeeper · #4 05-11-2017, 09:07 AM

I see or do this repair in the shop at least once every two weeks (repairs have quieted down quite a bit). With a lift, tools handy, and having done quite a few; it still takes me around 4.5-5 hours. I believe the hardest part of the whole repair is putting the turbo intake tube back on. I put the seal onto the turbo charger first and then take a heat gun to the tube to soften it up for easier install.

mb911 · #5 05-13-2017, 12:13 AM

Quote:

Originally Posted by joshuajeeper

I believe the hardest part of the whole repair is putting the turbo intake tube back on. I put the seal onto the turbo charger first and then take a heat gun to the tube to soften it up for easier install.

Yes! This was tremendously difficult when I replaced the thermostat. I lubed both the seal and intake tube with a bit of dielectric grease to make it easier but it still took some significant force to finally crack it. Heat gun seems to be a smart idea.