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Thread: Oil cooler

  1. #1
    Join Date
    Aug 2007
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    Duesseldorf, NRW, Germany
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    '90 850iM70B54, '91 850i

    Oil cooler

    Hi folks,

    does anyone know a source for the thermostat installed in the 850CSi oil filter housing?
    I'd like to fit an oil cooler to a non CSi and modify the oil filter housing but the thermostat is NA as a separate spare part.
    BMW wants me to purchase the entire unit which I'd like to avoid.

  2. #2
    Join Date
    Jun 2010
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    Hyperworld
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    555
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    '97 840CI
    Sounds ambitious.
    Housing needs to grow a pair, complete with passage ways.
    Plenty of external easies.
    {pics corrected per Wokke post below}


    Expect 27mm threads on that thermostat (probably, not).
    Sits on the line from the oil radiator, thus bypassing the filter, thus creating the pressure drop needed to detour.
    Deep dark special tool required for install/remove, so I can't examine any further. Unless I fab'd a tool.
    Last edited by Hyper; 04-08-2014 at 03:41 PM.

  3. #3
    Join Date
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    '90 850iM70B54, '91 850i
    Hey Hyper,

    thanks a lot for your reply.
    The standard housing you are showing is an E38/M73 oil filter housing - at least over here in our area.
    The standard M70 housing looks like the one you're showing on the right side whereas it actually doesn't have the cooler ports.
    The upper one is prepared for the cooler hose but the lower one has no thread nor is it drilled through. But changing that is no major issue for a machine shop.
    The thermostat is actually located inside the port underneath the pressure switch. IMO the arrows on your picture are the wrong way around.
    Both ports are also marked V (=Vorlauf=feeder) and R (=Rücklauf=return). This V-port also needs to be machined for the OEM thermostat but also this is possible.

    What you call a thermo valve in the third picture has IMO nothing to do with temperature. This valve is open if no filter is installed and allowing the oil in the filter housing to be drained through the tube which is connected directly to the oil sump. It closes once a filter is inserted making sure that the housing is always filled with oil even with the engine/oil pump not running.

    Cheers
    Wolf

  4. #4
    Join Date
    Mar 2013
    Location
    South TEXAS
    Posts
    437
    My Cars
    1993 850CI
    Hi,
    quick question. my filter housing doesnt have that metal tower.. i know the newer models have a plastic tower. is it normal for my filter housing not to have that metal tower? production date of my car is 12/92
    1993 e31 850ci Diamond Black
    1996 Mitsubishi 3000gt VR4 Pearl green
    1997 Mitsubishi Pajero LS Intercooler Grey
    1993 Nissan z32 300zx Twin Turbo Pearl White
    1991 Nissan Sentra GXE (Sedan) Pearl blue

  5. #5
    Join Date
    Jun 2010
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    '97 840CI
    Your opinion is good. Original pic corrected.
    Reminds me of being caught out over OT as found on a harmonic balancer.


    The housing shown is the late version, available to the e31 M60/62/73 in the gulf option, versus the earlier style shared with the e32.
    This particular one was pulled a couple years back from a race team in europe, if you can consider UK part of europe.
    There is no other valve on this example but it may have been messed with by the race team.

  6. #6
    Join Date
    Jun 2010
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    FL, Sydney, Hong Kong
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    1992 E31 850i

    The actual temp valve is a wax actuator inside the return (left) hole on this pic, complete with a spring and circlip. problem is the valve is missing in this pic.. My 91 M70 has hot-climate option and it comes with the oil cooler and the same filter housing as in this picture. I have recently took the whole thing apart for restoration so I'm dead certain of that.

    Wokke I cant remember off the top of my head but I don't remember the actuator having any manufacturer marking on it, except the number 85 which is probably the temperature. You'll also need the plastic sleeve around it which is actually the valve. Again there's no marking on it that I can remember. the spring and circlip are easy.

    I'll be with the car in a couple of weeks and will check again for you as the filter is still empty and out of the car. In any case I think your best bet is to get a filter from a hot climate car. Think SE Asia, Gulf and Australia. I would look for you but all the older cars in HK junkyards are exported to ME and Africa, and Aussies generally charge 2-3x because the cars cost 2-3x to start with because of the tax man, still, pretty sure I can get this in Australia. PM me if you need it.
    Last edited by affa; 04-08-2014 at 03:14 PM.

  7. #7
    Join Date
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    '90 850iM70B54, '91 850i
    Quote Originally Posted by affa View Post

    The actual temp valve is a wax actuator inside the return (left) hole on this pic, complete with a spring and circlip. problem is the valve is missing in this pic.. My 91 M70 has hot-climate option and it comes with the oil cooler and the same filter housing as in this picture. I have recently took the whole thing apart for restoration so I'm dead certain of that.

    Wokke I cant remember off the top of my head but I don't remember the actuator having any manufacturer marking on it, except the number 85 which is probably the temperature. You'll also need the plastic sleeve around it which is actually the valve. Again there's no marking on it that I can remember. the spring and circlip are easy.

    I'll be with the car in a couple of weeks and will check again for you as the filter is still empty and out of the car. In any case I think your best bet is to get a filter from a hot climate car. Think SE Asia, Gulf and Australia. I would look for you but all the older cars in HK junkyards are exported to ME and Africa, and Aussies generally charge 2-3x because the cars cost 2-3x to start with because of the tax man, still, pretty sure I can get this in Australia. PM me if you need it.
    Below the picture of the entire thermostat assembly. It indeed has no manufacturer marking and the number on it doesn't help either. I tried various brands (Behr etc.) in combination with this number but no luck.
    I did find a very similar looking actuator offered by Sandtler Motorsport and ordered it to check if it might fit. The plastic sleeve would have to be manufactured, spring and circlip are as you say not a major issue.
    The non oil cooler housing needs some machining in the R port because the circlip groove isn't existing and the step the sleeve sits on is much higher so it has to be drilled. Again possible.
    IF I find an actuator that fits the rest should be nothing major. But it barely makes sense for just a single housing considering that time is money as well.


  8. #8
    Join Date
    Dec 2013
    Location
    San Antonio
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    My Cars
    850i, '76 2002, '76 530
    I am interested in installing an engine oil cooler on my '91. Does the 'engine oil filter housing with oil cooler connections' 11427511171 used on the 740i, 750i, and 840i have the thermostat already installed? Seems like an easy enough installation to change out filter housing, add a cooler, and hoses to complete assembly. I have a cooler already that came out of a 7 series. Thanks,

  9. #9
    Join Date
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    99 840ci Sport Indv
    AFAIK there is no thermostat in the reservoir, just the extra connections.
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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  10. #10
    Join Date
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    Quote Originally Posted by Timm View Post
    AFAIK there is no thermostat in the reservoir, just the extra connections.
    Thanks, Tim! I am wondering if there is a thermostatically controlled valve in filter housing that opens valve for oil to circulate through the cooler.

  11. #11
    Join Date
    Jan 2005
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    Japan
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    11/88 E32 750iL+98 E36M3
    The easy access oil filter is mounted on the left inner fender. Features include large diameter hoses to insure ample oil flow and an anti-drain back valve. Thermostatic oil cooler control is located in the lower section. At a temperature threshold of 95°C, engine oil is directed to the external oil cooler for additional heat dissipation.
    see page 10, 11, 12 http://bmwe32.masscom.net/sean750/M70info.pdf
    1 Oil pan
    2 Oil intake, primary oil pump
    3 Primary oil pump with relief valve (4 bar, activation via filtered oil pressure)
    4 Oil filter (filter cartridge bypass valve-2.2 bar, one-way check valve, oil pressure switch, oil cooler valve-activated at 95° C)
    5 Filtered oil, main gallery
    6 Crankshaft main bearings
    7 Connecting rod bearings
    8 Piston pins (oil spray)
    9 Cylinder wall surfaces (oil spray)
    10 Oil feed bores in crankcase (cylinders 1 - 6 and 7 - 12)
    11 Oil feed bores in cylinder heads
    12 Oil gallery
    13 Oil spray pipes for cam lobe lubrication
    14 Camshaft bearings
    15 Hydraulic tappets
    16 Timing chain lubrication (oil splash)
    17 Rocker arm thrust (guide) pads (oil splash)
    18 Oil supply for hydraulically-damped chain tensioner
    19 Oil drain bore
    20 Oil intake, snorkel
    21 Oil pump, scavenger
    SHOGUN'S TRICKS AND TIPS FOR THE SEVEN SERIES
    http://twrite.org/shogunnew/topmenu.html

  12. #12
    Join Date
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    Quote Originally Posted by shogun View Post
    The easy access oil filter is mounted on the left inner fender. Features include large diameter hoses to insure ample oil flow and an anti-drain back valve. Thermostatic oil cooler control is located in the lower section. At a temperature threshold of 95°C, engine oil is directed to the external oil cooler for additional heat dissipation.
    So I can just change out the easy access oil filter (housing) from a model equipped with cooler, add lines, and cooler and have a OEM engine oil cooler?

  13. #13
    Join Date
    Dec 2006
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    6.5 second 69 Camaro
    Lot of options out there but yes! The filter housing may still be available new.
    Attached Images Attached Images

  14. #14
    Join Date
    Aug 2007
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    850Ci, M5, Model-S P85D
    FWIW,
    The only suggestion I have is to look for a compatible wax element in a coolant thermostat. The proverbial needle in a haystack.

    850CSi, p/n: 11 42 1 405 197 oil filter housing has an internal 85deg.C thermostat
    E31, E32, E38, E39, version p/n: 11 42 7 511 171 oil filter housing is identical except it has an 108deg.C internal thermostat.

    I installed the CSi oil filter housing on my 1997, 850 with the CSi oil cooler & lines.
    As companion upgrades I installed a 85deg.C coolant thermostat, 80/88deg.C fan switch and 105mm coolant pump pulley.
    On my 98, 740 which has the 105deg.C MAP thermostat, I installed the p/n: 11 42 7 511 171 oil filter housing that an 108deg.C internal thermostat. I got a new E38 OE oil cooler on eBay for $25.00..

  15. #15
    Join Date
    Dec 2013
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    850i, '76 2002, '76 530
    Thanks for the help!

    OEM lines and other parts would be nice to use. And the hard lines would definitely be easier to route vs larger diameter rubber or braided hose.

    I sure would prefer the 85C thermostat but that may be too difficult to obtain. May be worth looking for the CSi housing before making any purchases.

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