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  #211  
Old 10-20-2015, 02:09 PM
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Here's the technical spec of Loctite 404, a crazy glue meant for o-rings. Goes up to 120C 248F

https://tds.us.henkel.com/NA/UT/HNAUTTDS.nsf/web/4DF739D7BEABA90A882571870000D764/$File/404-EN.pdf

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  #212  
Old 10-20-2015, 02:21 PM
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On my 1st attempt to just slide some hose on double clamp the lower hose on oil cooler blew off after about 2.5 years at highway speed blown engine. On my second attempt I shoved tne hose up over the line stop and also put a little flare on end of lines because on my lines there was no barbs at all from the factory. I probably could not have got the hose on with lines on car instead with engine out lines off in a vise and using a heat gun I was able to push hose way up over stop then I put a clamp on each side of stop. I like the idea to anchor the clamps with wire and if I were to do it again I would use a special tool I just bought that uses basic stainless wire to make a clamp it was proven to me it has better clamping ability. I do not possibly see how they will ever blow off again but I guess I should check them for tightness as they have been on about 6 months now. I never thought they could of blew off the 1st time either I'm still thinking maybe I forgot to tighten that one up guess Ill never know for sure. It only makes sense to push the hose way up over the stop for more security of not coming off but would be very tough to do with lines on car.
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  #213  
Old 10-20-2015, 02:27 PM
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Quote:
Originally Posted by yuke View Post
On my 1st attempt to just slide some hose on double clamp the lower hose on oil cooler blew off after about 2.5 years at highway speed blown engine. On my second attempt I shoved tne hose up over the line stop and also put a little flare on end of lines because on my lines there was no barbs at all from the factory. I probably could not have got the hose on with lines on car instead with engine out lines off in a vise and using a heat gun I was able to push hose way up over stop then I put a clamp on each side of stop. I like the idea to anchor the clamps with wire and if I were to do it again I would use a special tool I just bought that uses basic stainless wire to make a clamp it was proven to me it has better clamping ability. I do not possibly see how they will ever blow off again but I guess I should check them for tightness as they have been on about 6 months now. I never thought they could of blew off the 1st time either I'm still thinking maybe I forgot to tighten that one up guess Ill never know for sure. It only makes sense to push the hose way up over the stop for more security of not coming off but would be very tough to do with lines on car.
On the lines that blew off after 2.5 years, you said you do not remember if you tightened the clamps initially. Did you check the clamps and snugged them up in those 2.5 years? My guess is no.

Edit: You used a heat gun on the hose? That is kind of dangerous because you could have easily weakened the hose by overheating it. Unless you have a temperature controlled oven, don't use anything hotter than boiling water to soften the hose.

Do you have pics of your second set of lines that have no barbs from the factory? Were they genuine Mercedes or some knockoffs?
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Last edited by funola; 10-20-2015 at 02:38 PM.
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  #214  
Old 03-27-2016, 02:06 PM
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Has anyone been to belmetric.com recently? Chrome (+ extensions) won't let me through and IE warns that the security certificate has expired.

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83 300SD
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  #215  
Old 04-29-2016, 11:41 PM
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I'm trying this Diesel911. Getting the dremel tool on Monday. Have everything else. Went and got some killer pipe at this spot in Sacramento that carries Parker hoses.

Got a 5/8" ID hose, with 4 semi-questionable worm clamps. There will be tests. Many tests, before I trust these clamps. But they may work.

I am grateful for this thread, I have read through this entire thing and am amazed at the amount of different responses. I love that about forums.

Thank you all for your dedication to your vehicles, it is inspiring. I am currently jobless(not for long) and short on cash so this fix is not only practical but definitely doesn't put a dent in the pocket.
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  #216  
Old 04-30-2016, 05:33 PM
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Quote:
Originally Posted by funola View Post
On the lines that blew off after 2.5 years, you said you do not remember if you tightened the clamps initially. Did you check the clamps and snugged them up in those 2.5 years? My guess is no.

Edit: You used a heat gun on the hose? That is kind of dangerous because you could have easily weakened the hose by overheating it. Unless you have a temperature controlled oven, don't use anything hotter than boiling water to soften the hose.

Do you have pics of your second set of lines that have no barbs from the factory? Were they genuine Mercedes or some knockoffs?
I was wondering the same thing. There ought to be at the front a least one single barb.
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  #217  
Old 05-01-2016, 08:03 PM
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My double hose clamped and appropriately spec-'d rubber hose oil cooler hoses on my conversion are going strong after ~18k miles. I do inspect them every time I check the oil, check the clamps at every oil change, and have never had to tighten them.

Ideal solution? Nope, Mach4 has done that. But workable? Yes absolutely.
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  #218  
Old 12-11-2017, 08:17 PM
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So are these oil cooler hoses under pressure all the time or only when a valve opens at a certain temperature? I don't want to get lulled into complacency in the winter just to have it bust open on the first day of summer.
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  #219  
Old 12-11-2017, 08:56 PM
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Yuke; If you had the engine out why on earth did you not replace the hoses with factory original types? It would have been easy enough.
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  #220  
Old 12-11-2017, 09:28 PM
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Quote:
Originally Posted by jimmypete View Post
So are these oil cooler hoses under pressure all the time or only when a valve opens at a certain temperature? I don't want to get lulled into complacency in the winter just to have it bust open on the first day of summer.
I can't remember at what temps but the Thermostat starts to open at a specified temp and then is compompletely open at another temp.

If you want to take the time you can feel your Oil cooler hoses and drive around the block and so on doing checks till the hoses start to get hot.
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  #221  
Old 12-11-2017, 09:43 PM
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In one of the Oil Cooler Hose threads someone bought a Collar Crimping set for airconditioning hoses to do his ac hoses and used the same hose on his Oil Cooler Lines.

That collar crimping tool is the closest a do-it-yourselfer is going to get to the factory made lines.
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  #222  
Old 12-11-2017, 09:50 PM
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Quote:
Originally Posted by rocky raccoon View Post
Yuke; If you had the engine out why on earth did you not replace the hoses with factory original types? It would have been easy enough.
Because they don't make them anymore? Only the cheapo insta-leak kind. Also that was 2 years ago...maybe we could get some updates though?

-Rog
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  #223  
Old 12-11-2017, 09:54 PM
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A hose shop will make up anything you want.
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  #224  
Old 12-11-2017, 11:39 PM
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Quote:
Originally Posted by Diesel911 View Post
In one of the Oil Cooler Hose threads someone bought a Collar Crimping set for airconditioning hoses to do his ac hoses ...
Me. I bought the crimper because I have three 1960's cars to fix/retro-fit AC. But when you have a hammer, you find nails. I replaced all AC rubber on my two 300D's, exc. the small "liquid hose" (looked fine). I also used for the oil cooler hoses on 1 car. But, you don't need to buy a $130 crimper since Oeticker stepless ear clamps should seal as tight or better (don't ask, ebay). Use 2 on each end if worried. Advantage, you can so on-the-car (must remove driver's motor bracket to remove oil cooler tubes). You don't need the special Oeticker crimp tool since cheap "nail puller" pliers works (or perhaps Home Depot Pex pipe collar crimp tool). If you do buy an AC crimper, you can later sell it on ebay to recover 90% cost.

BTW, when your high-pressure power steering hose starts leaking, you don't need any special tool, just two box wrenches, at least on 1982-85 300D's. They have Parker field-repairable fittings, which unscrew. Look for my post on re-hosing it. I learned that from the SLS wagon guys.
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  #225  
Old 12-12-2017, 03:49 PM
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Quote:
Originally Posted by jimmypete View Post
Do you safety wire the clamp(s)? Or do you poke a hole in the end of the hose and safety wire that?
\


The wire should be stainless and on the smaller side. Under the clamps and anchored somehow and somewhere up forward. The hose may loosen up with age and general deterioration. Or the inherent stiffness of the hose makes the common clamp ineffective. Not enough to reduce the indentation traction of the clamps to the hose though to any signifigant degree at the same time. So they will will still hold the wire in place on the hose. When there is not enough substantial resistance to retain the hose on the nipple otherwise occurs.

So the hoses just cannot blow off and that is the greatest liability here. Leakage on the other hand will develop slowly usually.

Really old hoses should be replaced just on general principal. In some way that blown off is not a probable possibility. All hoses deteriorate with time and usage. Trusting the survival of an engine to possible thirty to forty year old oil cooler hoses in many cases is just not smart. It is just better to have a safety wire than not in my opinion on home fabricated replacements.

Or repairing in a fashion where that if the hose becomes relaxed enough under the clamp pressure that it can not blow off. Unfortunatly nobody make a self tensioning clamp strong enough to compensate for some changes in the hose material under the clamps. As well as being tight enough originally. Safety wiring should not be a great deal in itself and easy enough to do. The sole function is to prevent the hose from sliding backwards under certain conditions. Most of us have experienced a hose even in good condition blow off a nipple on something. In some cases there is no prior leakage even present.

Only use the 15 mm hose of course as starting with oversize 5/8 hose is also a poor ideal. I have always found the common screw clamp to be somewhat too weak in many applications as well. Safety wires go a long way to eliminate the worse fear and actual experience of some people. A blown off oil cooler hose and engine failure are pretty much usually a matched event on these cars. It should not be too late to incorporate them on those that have supplied and installed their own hoses already either.


Last edited by barry12345; 12-12-2017 at 05:04 PM.
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