EHA weeping, Crack in Valve Cover - Mercedes-Benz Forum
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post #1 of 41 (permalink) Old 05-07-2019, 11:21 AM Thread Starter
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EHA weeping, Crack in Valve Cover

Greetings you Ole Benz lovers!

The Benz got through another winter! She ran great....but

Spring finally here, last snow fell a couple weeks ago, now it's time to dig into some new issues.

Part 1
1st - While changing the spark plugs, I noticed a hairline crack in the valve cover right in front (pic attached) I got a feeling the cracks going to run. Anyone seen this before? Should I start looking for a replacement? If so anyone know of any sources where I can get one?

2nd - I changed from premium unleaded gas with ethanol to premium unleaded without ethanol because I heard it was better. Shortly after I started experiencing hard starts. Coincidence? First thing in the morning car would start right up, after driving, then it sitting maybe 1/2 hour, come back and it acted like vapor lock, just crank and crank without starting. Finally start after pumping or holding pedal down and run great. Sit a couple hours or over night, same thing, start fine, then repeat scenario. Fuel pump, filter, accumulator, o2 sensor, fuel injectors, etc. all been changed within a year.

Could it have something to do with the crack in the valve cover or....

3rd - Noticed my EHA valve was weeping gas a bit around the edges. Didnt really smell gas, but could visibly see it. Replaced the seals, retightened 3 + .5 nm that didnt help. Is it shot?

These are my main issues right now. As usual I appreciate you guys support and feedback...
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post #2 of 41 (permalink) Old 05-07-2019, 01:01 PM
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EHA shot.

$250+ brand new.

May help with your hard starting, but you may need to adjust your mixture after install. I.e. whack off the top of the tower to access the 3mm hex screw.

I'm still having dirty starts after replacing my EHA, however I can always get it to start with 3-4 cranks. I'm suspecting fuel pump(s) (not your issue however).
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post #3 of 41 (permalink) Old 05-07-2019, 01:29 PM
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As mentioned, if the EHA is weeping, it's done.

As for the valve cover..if you have access to a pull yard, get one. If not, you may be able to get a local welding shop to patch it up. Looks to me it was over torqued at some point in hopes of stopping the front corner from leaking. Either way, get a new gasket.

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post #4 of 41 (permalink) Old 05-07-2019, 02:10 PM
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Might be cracked but I don't see any leakage.
Clean it up with the wheel of death and lay a bead of 2 part epoxy glue, loctite, araldite etc.
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post #5 of 41 (permalink) Old 05-07-2019, 05:01 PM
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I haven't seen an EHA that was leaking be repaired by new O rings or some sort of adhesive. I would avoid the adhesive.

Check for moisture at the weep holes on the back side of the EHA. Every bad one I've seen, leaks from there. Don't clean anything, just use a strong light to inspect it..

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post #6 of 41 (permalink) Old 05-07-2019, 05:12 PM
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Adhesive was for the valve cover Jayare
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post #7 of 41 (permalink) Old 05-07-2019, 05:23 PM
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Quote:
Originally Posted by boyd waugh View Post
Adhesive was for the valve cover Jayare
Thx Boyd..just didn't read it that way.

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post #8 of 41 (permalink) Old 05-07-2019, 05:35 PM Thread Starter
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Quote:
Originally Posted by Robert Kyle View Post
EHA shot.

$250+ brand new.

May help with your hard starting, but you may need to adjust your mixture after install. I.e. whack off the top of the tower to access the 3mm hex screw.

I'm still having dirty starts after replacing my EHA, however I can always get it to start with 3-4 cranks. I'm suspecting fuel pump(s) (not your issue however).
Thx Robert, I ordered an EHA, I'll tweak the duty cycle after the install..
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post #9 of 41 (permalink) Old 05-07-2019, 05:44 PM Thread Starter
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Quote:
Originally Posted by Jayare View Post
As mentioned, if the EHA is weeping, it's done.

As for the valve cover..if you have access to a pull yard, get one. If not, you may be able to get a local welding shop to patch it up. Looks to me it was over torqued at some point in hopes of stopping the front corner from leaking. Either way, get a new gasket.

Jayare

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No pull yards in this area that have w124's, and the closest one has only one ravaged 320. I don't no where all the w124's went when they were in this area. If anyone runs across any at their local yard, let me know. Otherwise, I'll look into a welding shop
.

Thx J
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post #10 of 41 (permalink) Old 05-07-2019, 05:48 PM Thread Starter
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Originally Posted by boyd waugh View Post
Might be cracked but I don't see any leakage.
Clean it up with the wheel of death and lay a bead of 2 part epoxy glue, loctite, araldite etc.
Thx Boyd,

But what is a "Wheel of death" lol, what is that a grinding tool?
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