Diesel RVs: [diesel_mercedes] Routine Valve Adjustment OM617 engine [4 Attachments]

[Attachment(s) from Nate included below]

ndy f

-- 8/17

Because it was record breaking hot Saturday , I naturally decided to work on my old Mercedes .....

Pic. # 1 shows the simple tools you'll need : .004" .014" feeler gauges , I highly recommend the stepped typ , they're not expensive and should last your lifetime .

A pair of 14 MM valve adjusting wrenches , I bought a set from Mark who makes them better than the factory M-B ones are , looking at them in Pic. # 1 you can see how Mark's are each slightly different length in the working end , this allows them to nest as you're working in very close quarters . the factory wrenches don't do this and I see a lot of burred adjusting nuts plus his are cheaper....

The big 3/4 round wrench holds the valve spring and retainer from moving as you're adjusting the valves .

The big combination wrench along the bottom is a 22 MM I use to rotate the engine to set the valves in the proper position , it's VERY IMPORTANT to only rotate the engine in the direction which it normally rotates ~ if you go too far don't panic , just turn it another full revolution until the valves are positioned properly again ~ DO NOT BACK UP .

Pic. # 2 shows what you'll see when you remove the rocker box if you're keeping up with the routine HOT oil & filter changes ~ it should look this clean inside ~ I didn't wipe it clean , this is what Detergent Moto Oils do .

Pic. # 3 shows how to use the open end 22 MM wrench to rotate the engine , I lift up the washer fluid resivoir and lay it aside for more clearance to swing the wrench ~ you'll need to press the V-Belt tight with your thumb so the pulley doesn't slip , these engines have a LOT of compression and take a bit of oomph to turn .

Pic. # 4 shows how the banjo bolt in the back end of the intake manifold should look ~ when the rocker box is off it's easy to reach and only needs a 12 MM box end wrench to remove , then you clean out the muddy oily gunk most have in there .

Mine was clean and I am well pleased .

That's bout it . you need to do this important adjustment every 12 months or 10,000 miles ~ if you keep after it , you'll only need to adjust one or two valves each time .

I hope this helps , it's a simple DIY job that the tools cost less than having the Dealer do it once and you need to do it a couple times every year .

Of course , a new valve cover rubber gasket every time .

-Nate

DCG Whse.

Your Tax Dollars at work !

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Attachment(s) from Nate | View attachments on the web

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