Photo DIY- M119 Engine Compression Check - Mercedes-Benz Forum
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post #1 of 14 (permalink) Old 06-07-2009, 02:27 PM Thread Starter
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Photo DIY- M119 Engine Compression Check

Greets,

Since it was time for me to change the Spark Plugs, I normally like to do a Compression Check, just to keep a record of the internal "Health" of my engines...

The write-up is from the WIS, which I was Shocked to see there was NO bypassing of any of the fuel relays, like most tutorials. Since my engine had no rear CPS in the location shown in the WIS, I went to the front sensors and unplugged them to keep the engine electrical system off-line.

Please note, DON'T push the Gas Pedal to Full Throttle like most Compression checks.. and place transmission in Neutral while cranking using the CAR KEY, rather than the Hand Starter like my other vehicles....

I hope this encourages someone to also keep up on their car's "Wellness" Check-Up...

Please note, this is for the '99 S420 M119.981 Engine. Of course, at the end, it is the "re-install in reverse order" mumbo-jumbo. Keep the Coil Spring orientation correct.
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post #2 of 14 (permalink) Old 06-07-2009, 02:28 PM Thread Starter
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Part II

Part II
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post #3 of 14 (permalink) Old 06-07-2009, 11:58 PM
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What a cool tool that compression tester is! Nice work again G! Nice 6000 series Hazet as well.
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post #4 of 14 (permalink) Old 06-08-2009, 01:09 AM
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You do realise that thats the cam advancer you are pulling of at the front of the engine and wont disable a thing
apart from that well done
Tim
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post #5 of 14 (permalink) Old 06-08-2009, 03:26 AM
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i love your timeless safety precautions. you work like a pro.
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post #6 of 14 (permalink) Old 01-21-2012, 01:05 PM
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G-AMG

Sorry to exhaust an old thread. I was looking and found this DIY which is closer to the engine in my E420. I have a copy of the WIS. Both your write-up and the WIS say to check the electrode "gap" to the specified value of 0.8 mm. I was wondering if you could explain what that means.

Also in your other M113 thread, you specified what amount to torque the coil packs. There is no recommended torque value on my WIS for installing the 3 bolts on each cover or the 2 screws on each coil. If there is none listed what do you use? 8 Nm like the M113?

Thanks,

MH

Last edited by HirschMandarin24; 01-21-2012 at 01:28 PM.
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post #7 of 14 (permalink) Old 01-21-2012, 07:41 PM
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Quote:
Originally Posted by HirschMandarin24 View Post
G-AMG

Sorry to exhaust an old thread. I was looking and found this DIY which is closer to the engine in my E420. I have a copy of the WIS. Both your write-up and the WIS say to check the electrode "gap" to the specified value of 0.8 mm. I was wondering if you could explain what that means.

Also in your other M113 thread, you specified what amount to torque the coil packs. There is no recommended torque value on my WIS for installing the 3 bolts on each cover or the 2 screws on each coil. If there is none listed what do you use? 8 Nm like the M113?

Thanks,

MH
Electrode gap is the spark plug gap. You get a little feeler gauge and measure the gap and adjust to appropriate measurement.

Don't fuss too much about torque values on the coil packs. Tighten until snug, then another 1/4 turn or so to tighten. It's not that important. Just don't leave it too loose so it will rattle loose and not too tight to crack the thing.


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post #8 of 14 (permalink) Old 01-24-2012, 06:18 PM Thread Starter
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Originally Posted by HirschMandarin24 View Post
G-AMG

Sorry to exhaust an old thread.


Both your write-up and the WIS say to check the electrode "gap" to the specified value of 0.8 mm. I was wondering if you could explain what that means.

Also in your other M113 thread, you specified what amount to torque the coil packs. There is no recommended torque value on my WIS for installing the 3 bolts on each cover or the 2 screws on each coil. If there is none listed what do you use?

Dude!

Not exhausting anything!

Yes, Electrode Gap. You need a Metric Gaping tool. Only a few bucks.

Sorry, in the first pic on https://www.benzworld.org/forums/g-cl...ange-m113.html
shows the tool. It is merely a L-Shaped calibrated wire you run through the gap and adjust the gap until there is slight resistance on the wire.

And your second question: No there is no torque value required on the M119 Coil pack. All the fastener does on the M119 is hold the "Spring" Retaining device down... the "Spring" is what is actually compressing the Pack.

Now, the M112/M113 is a different design. The bolt actually TRAVERSES the center of the coil pack..... thus, too much torque, you could "crush" the coil pack.

Hope this helps.

G
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post #9 of 14 (permalink) Old 01-24-2012, 09:14 PM
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Great! My compression across all 8 is about 185-190PSI

A healthy engine indeed!

"However, not the the aesthetic masterpiece you might have expected for a billion dollars, but all of them, and this one in particular, justifies it's price through sheer attention to detail." -Jeremy Clarkson

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It MUST have been that leather wrapped dash that got 'er going, what else do you have to offer?
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post #10 of 14 (permalink) Old 01-25-2012, 08:23 AM Thread Starter
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Great! My compression across all 8 is about 185-190PSI

A healthy engine indeed!
Ja. That is great! 12 Bar for you! That is AFTER your overhaul?
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