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

What's a water crossover pipe?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

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

I might have one of those lines. I'll look when I get home.

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Awesome, thanks! Any idea if bypassing this line is detrimental to the engine?Thanks-art

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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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.

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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OM617 in a 67 chevy pickup http://tinyurl.com/projectgmbenz

All '85 300D/SD did not have that line. Mercedes deleted it for the 1985 model year for some reason.




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1983 123.133 California
- GreaseCar Veg System

I don't think it would be a problem.


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1983 123.133 California
- GreaseCar Veg System

I do have one. If you're interested let me know.

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