PeachParts Mercedes-Benz Forum - View Single Post

BillGrissom · #26 08-12-2016, 08:25 PM

The high-pressure hose in one of my 300D appeared to have 2 layers, since the outer layer was spongy and delaminating at the compressor, probably what you termed "heat shrink". It appeared the inner part was just rubber, w/o a dense plastic liner as in "barrier" hose. Similar SAE fittings w/ integral ferrule are termed "Coll-O-crimp" (brand?). I think just a convenience, not to give superior clamping, though probably helps. I am not concerned w/ the hoses slipping off the M-B fittings (OK several years now). Millions of cars in the 60-70's had dealer or after-market AC installed, w/ similar barbed fittings and just a screw hose clamp (special AC ones w/ locating finger). My 65 Newport was like that and I had to cut the hose and aggressively peel it off the barb when I replaced them.

Before tossing your old hoses, cut off the metal ends and save, since those are special, and won't take much space in your garage. You or another guy here will likely need one in the future.

Re other M-B hoses. I recall that on some I rebuilt, their crimped ferrule had depressions that aligned with the ripples on the hose insert. Those had long ripples, not the many little barbs shown in post 23. I re-worked all AC and oil cooler hoses, so forget which. Anyway, I was able to align the crimps in my Master-Cool crimper to match close enough. Your high-pressure power steering hose can be replaced using just box wrenches. It uses "field-replaceable" fittings that screw on the hose. Be glad because I see ~$80 ea prices for those (Parker catalog?). If you can't find my post w/ photos, the trick is that the outer piece is a left-hand thread, so turn it "righty loosy" to unscrew from the hose OD. It is a large "light-bulb" thread. Same fittings on the SLS hoses (300TD guys, their posts informed me). Do buy high-pressure "2-wire" hydraulic hose for that (3000 psi rated, ebay, Tractor Supply), which is superior to what M-B used.