Oil cooler hose leak repair - Page 2 - PeachParts Mercedes-Benz Forum

winmutt · #16 05-25-2007, 04:07 PM

FWIW I understand Napa will rebuild for 20-30.

funola · #17 05-25-2007, 04:20 PM

That's a good price. But the problem is getting the lines off. If I have a lift it's a different story.

You don't think a good quality hose rated for pressure and temp and good clamps will do? What's max pressure? 60 to 70 psi? That's not very high pressure. 212F?

Quote:

Originally Posted by winmutt

FWIW I understand Napa will rebuild for 20-30.

winmutt · #18 05-25-2007, 04:45 PM

Quote:

Originally Posted by funola

That's a good price. But the problem is getting the lines off. If I have a lift it's a different story.

You dont need a lift to get the lines off? Just a jack. Some ramps would help.

Hatterasguy · #19 05-25-2007, 06:20 PM

I used wire reinfoced exhuast hose for my SD. I also used regular hose clamps but just double clamped them. This was done in October and when I sold the car a few weeks ago it was still fine, its not my car anymore so if they blow its not my problem.

Old300D · #20 05-25-2007, 06:27 PM

Quote:

Originally Posted by funola

That's a good price. But the problem is getting the lines off. If I have a lift it's a different story.

You don't think a good quality hose rated for pressure and temp and good clamps will do? What's max pressure? 60 to 70 psi? That's not very high pressure. 212F?

That's normal for most gassers. Schuman told me oil pressure for the 617 when cold could be 100+ psi.

funola · #21 05-26-2007, 10:55 PM

Old300D, I'm a bit confused. You sure you used McMaster p/n 54605K28 for the hose? The specs of that hose is:
Low Pressure SAE 30R7 Fuel-Line Hose 5/16" ID, 9/16" OD, 50 PSI

not 9/16" i.d. as you said below. The pressure rating is also on the low side. Someone said above that oil pressure can be as high as 100 psi on a cold start.

In preparation, I was able to undo both hose fittings on the oil cooler today. I do not have big metric wrenches but do have SAE. A 7/8 on the cooler nut and 1-1/16 on the hose nut worked ok and with a bit of a struggle it broke free. Now I have to get the hose and clamps together and do the job one of these days.

Btw, how much oil will come out of those lines? looks like the oil filter and oil cooler will empty.

Quote:

Originally Posted by Old300D

Yes, I used a dremel with a cutting wheel to remove the crimps. You can't link items directly, but go to www.mcmaster.com and go to catalog page 241. The clamp part number is 54205K11; it has a clamping range from 9/16" to 1-1/16", and it is 9/16" wide. It looks like this and it is the top item on the page.

The hose I used was on page 228, part number 54605K28. It's 30R7 hydraulic hose, 9/16" ID. I used 2 feet, but had to buy 5 @ $0.79.

charmalu · #22 05-27-2007, 01:18 AM

Funola, when I replaced my hoses on my 85. I loosened the lower fitting
at the cooler, then took a pair of loppers and cut the hose in the center.
I placed a pan under the cooler and turned the hose to point down to drain into the pan. this will eliminate some of the mess.
on the upper hose, i took out the oil filter, removed the hose at the cooler and blew some low pressure air through it to clear it of oil. be sure to place the lid back on

don`t ask .
charlie

funola · #23 05-29-2007, 09:34 AM

Bump. Still trying to find out the hose i.d I need for the oil cooler hose repair. I measured the pipe size and it is approx 5/8" o.d. Does anyone know if the barb size is the same as the pipe size or is it smaller? I want to buy the CORRECT hose before I start the job because once I cut into it the car is disabled and I can't go looking for the right hose.

Quote:

Originally Posted by funola

Old300D, I'm a bit confused. You sure you used McMaster p/n 54605K28 for the hose? The specs of that hose is:
Low Pressure SAE 30R7 Fuel-Line Hose 5/16" ID, 9/16" OD, 50 PSI

not 9/16" i.d. as you said below. The pressure rating is also on the low side. Someone said above that oil pressure can be as high as 100 psi on a cold start.

In preparation, I was able to undo both hose fittings on the oil cooler today. I do not have big metric wrenches but do have SAE. A 7/8 on the cooler nut and 1-1/16 on the hose nut worked ok and with a bit of a struggle it broke free. Now I have to get the hose and clamps together and do the job one of these days.

Btw, how much oil will come out of those lines? looks like the oil filter and oil cooler will empty.

Hatterasguy · #24 05-29-2007, 01:32 PM

I *think*, I want to stress think, that I used 3/4 on my SD.

funola · #25 05-29-2007, 01:44 PM

Quote:

Originally Posted by Hatterasguy

I *think*, I want to stress think, that I used 3/4 on my SD.

Thanks for the "think" part. If the oil cooler pipe is 5/8" o.d., that means it has to go up in size to a 3/4" barb for a 3/4" i.d. hose. Is that likely?

vstech · #26 05-29-2007, 01:45 PM

my blown motor used a piece of 1/2" pipe to bridge the hose. so that should be the ID of the hose, 1/2" nominal, would be 3/4" od, for the pipe, so 3/4" would be the ID of the hose.
and yeah 100+PSI strength on the hose. also the temp can get above 300°F.
John

funola · #27 05-29-2007, 01:48 PM

I know what I can do. Since I have heard the hose size is 3/8, or 1/2, or 9/16, or 5/8 and now 3/4". I'll just get a length of each so that I am covered. Is that a plan or what?

#28 05-29-2007, 02:10 PM

I've been driving MB diesels for 22 years, and I can tell you that the number one cause for having a motor blow is a bad oil cooler hose. When that happens, a otherwise nice car turns into a $300 hunk of metal and glass, because the cost to rebuild a motor right is around 5k.

Super glue and silicone is not going to hold back a high volume of oil at over 45psi.

funola · #29 05-29-2007, 02:19 PM

I am not disagreeing with you. I used super glue and silicone as a temporary measure to slow the leak until I do the permanent repair.

Quote:

Originally Posted by John Holmes III

I've been driving MB diesels for 22 years, and I can tell you that the number one cause for having a motor blow is a bad oil cooler hose. When that happens, a otherwise nice car turns into a $300 hunk of metal and glass, because the cost to rebuild a motor right is around 5k.

Super glue and silicone is not going to hold back a high volume of oil at over 45psi.

vstech · #30 05-29-2007, 02:21 PM

how about this, since your hose is 5/8" od, I must be wrong... when I get home, I will pull the broken line and measure it my self.
expect an update tonight.
John