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.

IPD rear sway bar

About a year ago I replaced the stock front sway bar with one from IPD. I actually bought the whole kit (25 mm front & 22 mm rear) second hand. The kit was nearly complete, but the blue IPD paint was partly peeled off, so I decided to paint both sway bars with a silver 2 part industrial polyurethane paint called Temadur 20. It’s available factory mixed in silver and is very tough.

Today I was about to mount the rear sway bar, but unfortunately the nut and square neck screw that holds the sway bar were severely rusted. And with the rear axle on jack stands, I couldn’t use the impact wrench. So my suggestion is to follow the IPD install guide, but I’d add a “step 0″:
Loose the rear nuts just a bit to make sure they aren’t too rusted to the square neck screw

In fact it got even worse when the right side nut just rotated with the screw. I had to untight the bracket to be able to pull down the old sway bar. The square neck screw was no longer square at the top, so I sourced new ones with nuts at a local hardware store, since this screw is discontinued (Volvo part number is/was 947292). I had to grind down the top so that the height was approximately the same as the original one. It’s also worth noticing that the screw I bought was about 10 mm longer than the original ones, which was good, since the IPD sway bar is much thicker.

Happily reassembling the damper bolts, I noticed they were too short because of the sway bar thickness! The original bolts from Volvo were  M12x130 mm. Apparently, IPD includes M12x140 mm bolts in the kit, but they didn’t come with my second hand kit. An M12x140 mm wasn’t the easiest bolt to find locally, but I finally found it at Tools for about $5. I also bought new nuts there.

So – lesson learnt again. A supposedly easy task isn’t always that easy. This took three sessions and a lot of time browsing different hardware stores because of the missing bolts and screws!

Svetsning

Under våren har följande delar i karossen svetsats:

  • Golv höger fram har bytts till ekonomiplåt
  • Vänster tröskel har bytts till ekonomiplåt
  • Vänster yttre och inre skärmkant har bytts till ekonomiplåt
  • Ett hål i vänster golv bak har svetsats igen
  • Bakersta hörnet för avrinning av vatten från bagageluckan har svetsats

Alla delar har målats med epoxiprimer följt av Temadur 20 RAL 9005 innan svetsning, därefter har skarvarna tätats med Hagmans gråa karosserikitt och målats enligt samma procedur. All interiör (förutom höger golv bak som ska bytas i framtiden) har målats svart med Biltemas svarta 2k polyuretan båtfärg som dessvärre inte finns att köpa längre. Hålrum har sprutats med Carosol TO3.

Anmärkningsvärt är att Biltemas karosseritätning inte kan övermålas med deras 2k epoxiprimer för båtar. Resultatet blir att karosseritätningen reser sig. Hagmans karosserikitt klarar sig däremot bra.