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#1
12-03-2015, 11:29 PM
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Power steering return line
I need to replace the low pressure return line. Does anyone know if this is Special size or a typical 3/8.
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1996 E300D 
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#2
12-03-2015, 11:32 PM
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It should be a standard size but probably not 3/8 inch, perhaps the metric equivalent of 3/8 inch?
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#3
12-03-2015, 11:38 PM
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Guess that would 9.5 mm
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1996 E300D
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#4
12-03-2015, 11:52 PM
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I'm trying to build a custom high-pressure hose. My measurements of the pressure hose are ID = 9.43 mm so that would be close enough; you should be able to use 3/8 inch hose.
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#5
12-04-2015, 12:03 AM
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Quote:
Awesome, thank you so much!
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1996 E300D
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#6
12-04-2015, 12:37 AM
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Autozone Sells the 3/8" Power Steering Return Hose by the foot and some stores Sell it in a plastic bag with 2 or 3 feet of Hose.
Power Steering Return Hose Specification SAE J189 http://standards.sae.org/j189_200306/ .
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84 300D, 82 Volvo 244Gl Diesel
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#7
12-04-2015, 08:53 AM
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For PS return hose, Gates Lock - On or the Dayco equivalent works fine. Transmission cooler hose works too. There is some really thick wall stuff that doesn't seal so well so I avoid that.
Standard fuel hose will work in a pinch though long term it will deteriorate, the lined barrier hose may have a better chance. I used 3/8" Gates Lock-On hose for my thermostat hsg bleed to coolant pressure tank and it clamped just fine.
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#8
12-04-2015, 10:05 AM
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Pretty sure I used 3/8" on my swap, just standard stuff the parts store had. ~13k miles and no leaks.
I can attest that air brake line will last less than 2k miles.
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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap
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