Volvo 240 Turbo oil cooler on B230FT / B230FK with 10-AN hose

This is a follow up on the 240 Turbo oil cooler hardline-conversion to AN10 post I wrote about a year ago! If you haven’t, read it before this post to get more into depth of what the oil cooler setup consists of!

The later B230FT/B230FK use a water cooled Mitsubishi TD04-13C turbo and therefore Volvo decided not to put a regular oil cooler on those cars like they did on the original 240 Turbos. Instead a heat exchange adapter is mounted where the oil filter normally sits. I needed to delete this setup in my 240 for two reasons:

  1. I’m going to replace the 13C with a non water cooled T3/T4 and therefore I want a proper oil cooler
  2. The oil filter is in the way for the original 240 Turbo downpipe, so I can’t use a standard oil filter. The downpipe also leans against the oil filter, which most certainly doesn’t aid the cooling.
Volvo 240 Turbo oil cooler setup

I had the complete cooler setup from a Volvo 240 Turbo, except for the lower mounting bracket, rubber cushion and the oil cooler itself. I bought a new Setrab ST613 which is the modern OEM replacement, having the same dimensions as the original oil cooler. In this installation the only difference from the original setup is that I’m going to use 10-AN fittings and hoses instead.

To summarise, the oil cooler kit is bolt on, with the exception of one water pipe that has to be plugged (or replaced) and the oil feed line that has to be replaced with a hose. The upper bracket needs minor adjustments if you’re going for the Setrab. Continue reading to get all the details!

Fabricating the lower bracket

I created a paper template based on measurements from an original lower bracket (number 19 in the diagram) since the lower brackets are out of stock forever (you can download the template here). I then used a Dremel to cut it from a piece of steel and a vice to do the 90 degree angles. Finally it was painted with black Temadur 20.

Another piece that is out of stock is the rubber cushion (number 22 in the diagram) that the lower bracket sits on. This can however be made from a standard radiator cushion by cutting some on one end and drilling a new hole.

The upper and lower and brackets were mounted on the Setrab with 20 mm stainless M6 bolts, washers and nuts (the original oil cooler has some special very fragile aluminium fittings). A few mm of the corners of the top bracket had to be “adjusted” with the Dremel for the Setrab to sit flush.

Finally the cooler was bolted to the car. The bottom plate already has holes for the lower bracket. The top plate already has a weld nut, but a small hole had to be drilled for the upper bracket to align pin.

Removing the heat exchanger

First thing was to drain the car from coolant. The oil does not have to be changed and can stay in the car during the operation, but an oil change is never wrong. The two coolant hoses that go to the heat exchanger has to be unclamped. One is attached to an adapter in the engine block and the other is attached to a pipe that goes around the engine at the back.

The hose in the engine block sits in the same hole as the drain valve on all other redblocks. So I simply took a nut and drain valve from another block I had laying around (Volvo numbers: nut 3531383, drain valve 966723). Don’t forget to Loctite it.

The second hose is attached to the water pipe and is the more tricky one. The B230FK/FT has an extra outlet on the pipe which the other redblocks don’t have. The best solution would of course be to use one of those normal pipes (Volvo 1332032), however it’s a major pain to replace that pipe when the engine is in the car. It was decided to replace it the next time the engine is out. For now, a piece of plugged hose was used as a temporary solution.

With the hose situation solved, I removed the oil filter to get access to the bolt that holds the heat exchanger in place. The bolt has a 30 mm head and with the bolt removed, I just pulled the heat exchanger off.

At this point I realised that the sandwich adapter from the 240 would never fit because of the oil feed hardline. Luckily, I was replace that anyway with a steel braided 4-AN hose that I already have. So the oil feed hardline was disconnected from the turbo and the engine block. More about this later on.

Installing sandwich adapter and oil hardlines

Before continuing with the sandwich adapter, the bracket that holds the two hardlines in front of the engine had to be mounted. It sits between the the alternator and the engine block, so the alternator had to be removed…

A nipple (Volvo’s naming) was screwed in the engine block with the short threaded side in the block. This nipple is unfortunately out of stock, but an alternative be found in one of those universal oil relocation kits. A new o-ring (Volvo 967343) was placed on sandwich adapter and screwed on with a large nut, although not fully tightened so the adapter could rotate a bit.

The two hardlines were then loosely mounted on the bracket in the front and with banjo screws and four new washers (Volvo 957179) on the sandwich. It took a lot of wiggling of both the hardlines and the sandwich adapter until I got everything perfectly lined up. For a moment I was worried that the larger Biltema alternator on my car would be a problem, but there’s maybe 2 mm clearance between the alternator and the hardlines! Lastly I tightened every bolt and nut.


Making and installing 10-AN PTFE hoses

The Setrab oil cooler is M22 threaded so you can equip it with the fitting adapter of your choice. Since I’m going full 10-AN, I ordered the M22U-AN10 adapters. They have a built in o-ring and are made of aluminium.

Now it was just a matter of making two hoses with female 10-AN fittings in each end. The original Volvo hose has straight fittings for the hardline and 90 degree angled fittings for the oil cooler.

I chose nylon braided PTFE hose, since it’s the most durable, discreet and least paint scratching alternative. And also the most expensive one! Though it’s a big advantage being able to create life long durable custom hoses with perfect lengths yourself, and it’s not particularly hard if you follow this guide.

The upper oil cooler inlet/outlet should be connected to the lower hardline, and the lower oil cooler inlet/outlet to the upper hardline. This means that we need one longer and one shorter hose.

The longer required 670 mm hose and the shorter 430 mm hose (total length of ~740 mm respectively ~500 mm with fittings).

Fixing the oil feed

The oil feed line that was removed was attached to the block with an M14x1.5 banjo bolt, and to the 13C with an M12x1.5 banjo bolt. I now had to adapt them to the 2 ft 4-AN female to male steel braided hose I already had.

On the block I put a brass adapter with M14x1.5 outer threading and 4-AN inner threading and Loctited it. This is a much better solution than an M14 banjo to 4-AN, since it will sit to tight to the engine block. It’s better if the hose connects straight into the block.

On the 13C I put a male M12x1.5 to male 4-AN aluminium fitting and a washer. This is good, because now at least the oil feed is prepared for the T3/T4 turbo (which has a 4-AN male inlet). When I replace the turbo I will replace the leaking oil return as well with a hose, but that’s another story.

Test drive

The sandwich adapter has a built in thermostat that opens when the oil (not water) temperature hits 75 °C. Just starting the car is not enough, a hard test drive must be done to fully test that it doesn’t leak. Which is kind of intimidating… Everything went well though and I’m happy with the conversion, even though it was a lot of work!

Since I did the conversion I’ve driven hundreds of kilometers without any problems! I recommend doing this if you’re upgrading the turbo but want a OEM style oil cooler installation.

240 Turbo oil cooler hardline-conversion to AN10

I have a fairly complete oil cooler setup from a Volvo 240 Turbo (B21ET) that I will replace the current B230FT water-cooled system with. One reason is that I can’t change the oil filter without removing the downpipe. Another reason is that a real oil cooler is a real oil cooler. Apart from the oil cooler itself and some hoses, I’m only missing the lower bracket (part 19) for the oil cooler, but that will be fabricated later on.

Most aftermarket oil cooling products today are AN-standard, just as fuel and Turbo plumbing. In contrast, the 240 has all metric fittings. Since my plan is to buy an oil cooler with AN10-fittings and fix steel braided PTFE hoses myself, I started to look for how I could AN-convert the 240 Turbo setup. I want to keep the hardlines instead of getting a block adapter. The reason for this is that there’s a lot of stuff in the way for the hoses, and the original hardlines look very nice. The problem is that the hose connectors on the hardline are metric L12 fittings.

Electrolysis and painting

This summer, before I’d done the proper oil cooler research, I derusted the hardline and brackets with electrolysis and spray painted them with 2k Temadur 20 silver metallic using a Preval sprayer with great results. It’s amazing how the electrolysis can remove scale rust. I then let the parts take a couple of hours bath in phosphoric acid to etch before painting.

Soldering AN10 fittings

So I went to Hydroscand, a chain available all over Sweden that presses hoses and has all kind of fittings and hoses in stock. They have helped me before when I replaced the rubber hose with PTFE on the hydraulic clutch line for the M90. The Hydroscand guy I talked to was very helpful and showed me the exact same fitting combination as was described in a reply on my thread in Turbobricks forum: ‘L12 to 3/8″ BSP and 3/8″ BSP to AN10’. He pointed out that the ferrule on the hardline probably had been overtightened and suggested that the best was probably to find someone who can remove the current fitting and solder new AN10 fittings. Unfortunately Hydroscand don’t do welding or soldering services. The cost for the adapters would probably be around $30 with some added weight as bonus.

So I found a local plumbing company, the kind that installs piping in bathrooms, fixes leaks and more. Showing up there with requests of installing American fittings was exotic, since they only work with metric stuff and normally don’t do work on cars… However he took on the challenge and asked me to go and get some steel weld-in bungs.

I went to a nearby Biltema and got a pair of AN10 steel weld-in bungs (79783) for around $10 that happen to have an inner diameter of about ~12.2 mm. The outer diameter on the oil cooler hardline is 12 mm. The plumber “simply” removed the ferrule from the hardline, inserted the hardline a couple of mm into the weld bung, and finally soldered it in place. The good thing about this conversion is that all measurements match the original setup very well, since no pipe was cut away. The L12 fitting nut was 22 mm and the AN10 nut is 1” (25.4 mm). Space shouldn’t be an issue, although I have not fitted the pipes to the engine yet.

Next step is to fix some paint on the new fittings and scuffs, and order a Setrab oil cooler with AN10 fittings and hoses. Read about it here!