|240 Oil Cooler Page
Updated: April 4, 2021 CONTACT
M A I N S
|Volvo Red Block OIL COOLER
This information may come in handy when working on or modifying oil cooler systems on 240s or other red block Volvos.
The factory oil cooler thermostat in my 240 Turbo oil filter plate seemed to stop working as it should. My guess is it was stuck in the open position, since it was taking forever for the engine oil to come up to temperature. So I decided to add an IN-LINE oil cooler thermostat in the lines between the engine and the oil cooler.
|2019 HOSE UPGRADE AND NEW PLUMBING PROJECT
In 2019 I decided to do a complete change with all new parts for my remote oil filter and RX7 oil cooler plumbing. I was previously using cheap oil hose that I bought years earlier from Summit Racing. It had served well, but after years of heat it had begun shrinking and hardening and the hose clamps were loosening and causing leaks. I could have just replaced it with new oil hose from Summit, but instead I decided to upgrade to Aeroquip Socketless hose.
My suggestion if you can afford it is Aeroquip Socketless Hose (pictured below). This premium hose has a rubber core and it connects to special barbed Aeroquip Socketless hose fittings. Assembly is much faster and easier than other racing hose fittings. And routing hoses is easy because these hoses are more flexible than most other racing hose with stainless steel braided covering. Aeroquip Socketless is rated at 300 degrees Fahrenheit. More general info can be found here: https://www.jegs.com/p/Aeroquip/Aeroquip-Socketless-Racing-Hoses/750321/10002/-1
While no clamps are technically required for Aeroquip Socketless hose, a smart practice is to add simple Oetiker Clamps or Pinch Clamps. This will offer a stronger connection and seal, just in case. These clamps may be found at Summit Racing, Grainger or other parts suppliers.
Here are some videos showing the installation of Oetiker clamps:
I decided to replace the factory Volvo Wahler sandwich plate with an aftermarket adapter. Plus I decided that I would install a remote oil filter under the front right corner of the car.
The long factory threaded nipple needed to be removed. It's threaded into the block and if it's never been removed, it will be tight. A pipe wrench will give you the grip and leverage you need.
This oil filter adapter is Derale Cooling Products PN 35703 from Summit Racing: https://www.summitracing.com/parts/der-35703. The threads in the ports are AN -10 (0-ring). This means that an there is a recess in the adapter ports for an o-ring to be used under each of those fittings. The fittings are Aeroquip FBM5163 AN -10 male to -8 male adapters and may be found here: https://www.summitracing.com/parts/aer-fbm5163. I used reducer fittings because I prefer to use smaller AN -8 oil hose, which has an ID of 1/2 inch.
The longer threaded nipple I removed is Volvo PN 1306707. A new, shorter threaded nipple was needed because I was removing the thick Wahler adapter plate. This caused a bit of a headache, because the only short nipple I had on hand was the 1 inch size shown in the below photo. It was too short.
A factory shorter nipple used in all Volvos without an oil cooler adapter plate is 1 5/8 inches long, Volvo PN 418440. This is the same part used for all red blocks beginning with the B18.
I couldn't find one with that length and nearly every 3/4-16 nipple available on-line was either 1 inch or 1.25 inch long. So I ordered a 1.25 inch nipple and waited. To my surprise, it worked just fine. I was able to get 5 turns for the new Derale adapter.
The third photo shows some heat shrink tubing. I've had some things vibrate loose before, so I added that as a cheap safety measure.
Permatex thread sealant with Teflon was used for all threaded adapters. This is essentially what people refer to when using "liquid Teflon tape."
While routing the hoses toward the front, there may be places where they come close or actually touch parts of the car. If you have a way to clamp them to the frame, that would be a good solution. Otherwise some insulating material, like this rubber sheeting, can be used to protect the hoses from chaffing.
Here's my RX7 oil cooler. It's mounted under my car behind the front spoiler openings.
That's the IN port on top. These ports are threaded M18 x 1.5 and I could have used an 18 mm x 1.5 to -8 AN Male Adapter and then a 180 degree AN hose fitting, but space is limited too much above this cooler. So I found the shown M8 x 1.5 aluminum banjo fitting in my parts bin and decided to make it work. It's bolted to the port using an M18 x 1.5 banjo bolt. Then I added a -8 AN Male to 3/8 inch NPT Adapter to the banjo fitting: https://www.summitracing.com/parts/aer-fbm5007 and then the -8 AN 90 degree Aeroquip Socketless hose end: https://www.summitracing.com/parts/aer-fbl1533.
Normally this cooler will use an aluminum crush washer on either side of that banjo fitting, but I used metal-bonded sealing washers instead.
Here's one of the metal-bonded sealing washers below.
Here's the fitting I used in the RX7 cooler OUT port. It's Russell PN 670561, 18 mm x 1.5 to -8 AN Male: https://www.summitracing.com/parts/rus-670561.
I bought this set of metal-bonded sealing washers: https://www.amazon.com/gp/product/B07CKVYWD4/
Here's the RX7 oil cooler installed.
Here are the remote filter parts that are to be mounted under the front right corner of the car behind the bumper.
The thermostat sandwich plate below is the one without the body mount. This plate allows oil flow through the filter when cold, but will restrict flow to the oil cooler until it reaches temperature. It was made by Hayden: https://www.summitracing.com/parts/hda-205. The oil filter mount is Permacool PN 1791: https://www.summitracing.com/parts/prm-1791. It fits a Volvo oil filter or any similar filter using 3/4-16 threads.
The fittings are the same as used on the Derale adapter on the engine. Aeroquip FBM5163 -10 AN male to -8 AN male adapters and may be found here: https://www.summitracing.com/parts/aer-fbm5163.
Here's the remote filter mounted in place just ahead for the front-right tire. I made a mounting bracket from sheet steel. It's a very convenient place to change filters.
The 90 degree fittings on the filter mount are AN -8 90 degree Aeroquip Socketless hose ends: https://www.summitracing.com/parts/aer-fbl1533.
The 45 degree fittings on the thermostat plate are AN -8 45 degree Aeroquip Socketless: https://www.summitracing.com/parts/aer-fbl1523.
This photo is peeking just under the front spoiler. The bottom of the plumbing is about 2 inches above the bottom of the spoiler.
And here's a pic with the belly pan in place. It has a few snips to make things fit.
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