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  #1  
Old 10-24-2011, 04:10 PM
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Water crossover pipe

Hello all, I have an 85' 300td. While trying to diagnose a loud engine knock, I noticed the water crossover pipe is missing. The bolts are in but the small hard line is missing. Was wondering if this matters, would possibly cause a knock, or just a harmless alteration. Any ideas?? Thanks for any help-Art
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Old 10-24-2011, 04:31 PM
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What's a water crossover pipe?
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Old 10-24-2011, 04:50 PM
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I've also heard it called a bleed line connection between the cylinder block and head. It's a small horseshoe shaped hardline with banjo bolts at both ends located behind the fan in the front of the engine. Thanks
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Old 10-24-2011, 06:44 PM
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I might have one of those lines. I'll look when I get home.
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Old 10-24-2011, 08:07 PM
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Awesome, thanks! Any idea if bypassing this line is detrimental to the engine?Thanks-art
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Old 10-24-2011, 11:02 PM
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The pipe is not needed once the engine is filled with water.
It's only used to bleed the water pump housing during fill up.
If you don't have the pipe, just remove the plug in the water pump housing after fill up to bleed the air out.
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Old 10-25-2011, 12:25 AM
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While we are on that topic, would it be detrimental to the engine if someone had disconnected and stopped off both heater hose connections? Are they needed to e.g. Allow an air pocket to escape from the head?
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Old 10-25-2011, 02:53 AM
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Quote:
Originally Posted by Art300TD View Post
I've also heard it called a bleed line connection between the cylinder block and head. It's a small horseshoe shaped hardline with banjo bolts at both ends located behind the fan in the front of the engine. Thanks
All '85 300D/SD did not have that line. Mercedes deleted it for the 1985 model year for some reason.




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Old 10-25-2011, 02:55 AM
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Originally Posted by cell View Post
While we are on that topic, would it be detrimental to the engine if someone had disconnected and stopped off both heater hose connections? Are they needed to e.g. Allow an air pocket to escape from the head?

I don't think it would be a problem.


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Old 10-25-2011, 12:22 PM
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I do have one. If you're interested let me know.
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