|
|
|
|
|
|
|
#1
11-14-2007, 03:30 AM
|
||||
|
||||
|
Who knows the oil pressure in the engine Oil Cooler?
car 84 300D turbo
Is there anyone out there who knows the oil pressure in the engine Oil Cooler or the hoses that go in and out of it? Reason: To determine what type of pressure replacment hoses would be sujected to. 
|
|
#2
11-14-2007, 04:01 AM
|
||||
|
||||
|
I can tell you that it won't exceed the maximum engine oil pressure. I can also tell you that I haven't seen it get anywhere near 100 PSI, though i wouldn't say it's impossible.
For the hoses on my '77 300D, I used oil-rated hose with a maximum working pressure rating of 300 PSI. Works fine. It was in a dusty bulk pack box behind the counter at a parts store, and ordinarily sees use as power steering system line. I actually spent more on the 8 hose clamps than I did on the 4 or so feet of hose. *edit: Beware of some import clamps. Use good stainless clamps, or ones with zinc coating or a black oxide finish. I won't use most McParts store clamps on anything. They stress fracture or corrode apart too easily. Special order them if you have to. It's worth it.
__________________
- K.C.Adams '77 300D Euro Delivery OM617 turbo / 4-speed swap 404 Milanbraun Metallic / 134 Dattel MB-Tex Current status: * Undergoing body work My '77 300D progress thread Last edited by KAdams4458; 11-14-2007 at 04:09 AM. Reason: Added info
|
|
#3
11-14-2007, 07:24 AM
|
||||
|
||||
|
According to Boyle's Law, the pressure anywhere in a closed hydraulic system is equal. It will be whatever the gauge in the IP says (assuming that gauge is accurate).
__________________
1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags 
|
|
#4
11-14-2007, 12:04 PM
|
||||
|
||||
|
Quote:
If IP means injection pump you are speking about the wrong area. I am talking about the oil pressure that is in the engine oil cooler. I believe the oil goes through the cooler and into the oil pan but I am not sure. The oil in this area dose not need to be as pressurised as the oil that goes directly into the engine.
|
|
#5
11-14-2007, 12:13 PM
|
||||
|
||||
|
Quote:
__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
|
|
#6
11-14-2007, 09:02 PM
|
|||
|
|||
|
Quote:
|
|
#7
11-15-2007, 01:39 AM
|
||||
|
||||
|
Quote:
I have been a member for about 1.5 months and when I have read IP in other threads it has always ment Injection Pump. When I get conflicting information I ask questions. Now the next time I see IP I know that some people mean instrument panel. You can hook up a fuel pressure gauge to your fuel injection pump if you want to. It would tell you the pressure between the fuel supply pump and the relief valve that controls the pressure on the side of the fuel injection pump. When I worked in a fuel injection shop an ran these types of pumps on the test stand I always have a gauge on it. The relief vlave springs can weaken and the valves on the supply pump can ware out and the gauge would indicat. On the a vehicle it could indicate when you need your fuel filter changed.
|
|
#8
11-18-2007, 04:38 AM
|
|||
|
|||
|
What sort of upgrades have you done to your MB?
i bet there is an AN connector with a port for a gauge. I could possibly hook it up if someone can source this above connector
__________________
Current Stable: 1994 S500 v140, 210k miles, white with grey. Former Mercedes in the Stable: 1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now) 1984 300CD Turbo Diesel 150 k mi sold 1982 300D Turbo Diesel 225 sold 1987 300D Turbo Diesel 255k mi sold 1988 300 CE AMG Hammer 15k mi sold 1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020) 1992 500E 156k mi sold etc.
|
|
#9
11-14-2007, 12:12 PM
|
||||
|
||||
|
I think this time IP is Instrument Panel...
__________________
-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250
|
|
#10
11-14-2007, 12:23 PM
|
||||
|
||||
|
the gauge on all MB instrument panels... IP if you will, is always pegged, it could be 45 psi, but it could just as easily be 1000psi... no way to know with the crappy gauge MB put in the panel.
__________________
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 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
|
|
#11
11-14-2007, 12:43 PM
|
|||
|
|||
|
This depends on the vehicle, and if there is a system pressure relief valve and what that might be set to begin relieving pressure.
The 190E 2.3-16 engine has a higher capacity pump and it, regardless of oil temperature (and it has an oil temperature gage) is always pegged at the 3 bar mark. This engine has a relief valve built into the oil pump housing. I am not sure the W123 616 or 617 engines have such a device. At any rate, the pump outlet goes to the filter housing. In the filter housing there is a thermostat that diverts flow to the radiator when the oil gets hot. When the oil is not hot, the oil bypasses the oil cooler flow path, and goes directly to the OD of the replaceable filter element. This volume is always connected to the oil cooler (it is where the return flow goes to the filter), so, the oil cooler is always at the pressure of the OD of the oil filter, which is going to be the pump discharge pressure and that varies based on temperature. The pump discharge pressure, based on the wall thickness of the filter housing, isn't too high. It is likely highest with cold oil, since the pump is a positive displacement type pump and the flow rates with cold oil generate more resistance which demands greater pressure and the positive displacement pump is happy to provide it. Which how the oil selection for winter can be critical for getting the starter to spin the engine fast enough to start. I hope this helps. Jim
__________________
Own: 1986 Euro 190E 2.3-16 (291,000 miles), 1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000, 1988 300E 5-speed 252,000 miles, 1983 240D 4-speed, purchased w/136,000, now with 222,000 miles. 2009 ML320CDI Bluetec, 89,000 miles Owned: 1971 220D (250,000 miles plus, sold to father-in-law), 1975 240D (245,000 miles - died of body rot), 1991 350SD (176,560 miles, weakest Benz I have owned), 1999 C230 Sport (45,400 miles), 1982 240D (321,000 miles, put to sleep)
|
|
#12
11-14-2007, 01:08 PM
|
||||
|
||||
|
Quote:
 Why is the gauge crappy? I think if you test it, you will find it is quite accurate. It would have been nice if Mercedes used a gauge where the scale pegs at 100 psi.If one is really curious what the oil pressure really is, another gauge can easily be tee-ed in to the oil line.
__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
|
|
#13
11-14-2007, 08:01 PM
|
|||
|
|||
|
Quote:
|
|
#14
11-14-2007, 12:39 PM
|
|||
|
|||
|
According the section 18-005 of the FSM, the cooler connection is on the upstream (dirty) side of the filter before the oil returns to the pan (same as the gauge connection). The pressure relief on the oil pump is set at 7 bars and the bypass around the oil filter is set at 3.5 bars. I would assume that the oil cooler can see at least 3.5 bars (53 psig), but probably not more than 7 bars (105 psig), depending on temperature, rpm, and the pressure drop through the filter and/or bypass.
|
|
#15
11-14-2007, 02:52 PM
|
||||
|
||||
|
I would say 10bar. If you went over 7 and failed to pop the hoses sure would. IIRC 200PSI is the recommended hose.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
|
 |
| Bookmarks |
|
|
Hybrid Mode
