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#1
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W123 Coolant (Bypass?) Hose Replacement
I've searched around but not knowing the correct name for this hose is netting me little in results.
What I'm referring to is the approximately 3" long coolant hose, about 1.5" in diameter. It connects the water pump to the thermostat housing (I believe the thermostat is in there) on the front of the engine. Anyhow, what I'm trying to figure out is how much cussing will it take to replace that hose? At first I thought it was a two minute job but upon closer inspection it appears that I will need to remove the water pump as the thermostat housing seems to be cast right into the head. Someone else must have experience with this, I can take a picture if my description is insufficient. Thanks!
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1987 300SDL 167k 1992 Volvo 740 140k 1990 Volvo 740 250k 1989 Volvo 240 269k Anyone want to trade an old Volvo for an '87 300sdl? |
#2
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not sure on the OM616 but on the OM617 you can remove the whole thermostat housing (the top of the bypass hose connects to it there); three screws if i remember correctly mounted to the side of the head
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#3
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Thanks!
I probably just need to take a closer look, that would be a very strange (if not impossible) casting so there is probably a seam I missed.
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1987 300SDL 167k 1992 Volvo 740 140k 1990 Volvo 740 250k 1989 Volvo 240 269k Anyone want to trade an old Volvo for an '87 300sdl? |
#4
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The first thing to try is tightening the clamps. These hoses are very high quality from the factory and do not need replacing all that often. If that does not work you may be able to get it out without removing the stat housing. The old hose can be cut if necessary to get it out and you may be able to wiggle and fold the new one to get it in.
I have had at least 30 old benzes and cannot remember for sure about how to replace this hose so that gives you an idea how seldom they go bad.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#5
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I just replaced that on my SD.
I removed the two bolts holding the the part to the engine (no gasket), removed the hose, got a foot of 1 5/8 inch hose from the local auto zoo, cut to fit, installed a gasket, bolted everything back up, no problems.
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83 SD 84 CD |
#6
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The thermostat housing bolts up to the block on your OM616 just like the OM617. I took the housing off when I got my 240d because I had a leak there as well and found out that the part where the housing fits up to the short heater hose was broken. I too got a piece of heater hose from the local auto parts store and cut it to the proper length. I didn't/don't have a gasket between the housing and the block either and it doesn't leak there. For some reason, I thought I remember seeing a gasket in the parts diagram at the dealer parts dept.
After all this, my new hose still leaks which I attribute to my broken housing. How bad is the hose? Maybe tightening the two hose clamps will fix the leak.
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----- 1980 240D 1993 300D 2.5 2002 Golf TDI |
#7
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That is only gong to happen in a story that begins with "Once upon a time..."
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#9
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I used gas tank filler hose 1-5/8" SUPER thick rubber, with cloth reinforcement. very good stuff.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#10
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Quote:
Uploads aren't working right now, my old hose has a split.
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83 SD 84 CD |
#11
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Wow, that was all the info I needed and then some. This forum never ceases to amaze me.
Thanks for all the help everyone!
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1987 300SDL 167k 1992 Volvo 740 140k 1990 Volvo 740 250k 1989 Volvo 240 269k Anyone want to trade an old Volvo for an '87 300sdl? |
#12
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Thermostat bypass hose, ***************, https://www.***************/search/product.asp
Thermostat bypass hose, ********az,
https://www.***************/search/product.aspx?sid=zidlbafu0oqubc55zje2az55&partnumber=900271-042012 Quote:
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#13
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Quote:
Anyway thanks to all those providing info on this thread
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i know Jim Smith. i don't actually know him, but I know of him
http://imageshack.com/a/img923/6201/RQ1H6A.jpg |
#14
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Sev,
Thanks for posting this. I also was going to suggest silicone hose. I used that on my 64 Valiant slant six engine for its short bypass hose (5/8"D), and the silicone let me easily work it into that small gap, plus should last forever. I used much larger silicone hose (2.5"D?) for the turbo inlet on my 1985 CA 300D. Same on my 1984 300D, installing a 1985 CA frame-mounted air cleaner. It comes blue & red, if you want a purty engine. It cuts easy w/ a cheap razor knife.
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1984 & 1985 CA 300D's 1964 & 65 Mopar's - Valiant, Dart, Newport 1996 & 2002 Chrysler minivans |
#15
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Coolant by-pass
Red Alert! Two weeks ago I started to replace my by-pass hose. After twisting off both bolts (and I was gentle) I still don't have my car running. Use caution removing the bolts, there isn't enough penetrating fluid on the planet to dissolve the oxidation and crud. I might add if the bolts don't break free immediately, re-think it. I wish I would have left it alone. |
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