Re: E36 v2
Set about sorting the thermostat this weekend, along with a couple of other bits. They use a 92deg thermostat as standard, I've switched to an 88deg. I had ordered a few new bits from BMW in the week - two new radiator supports (as the standard euro 328 ones are not the same as the M3), and a new inlet elbow as mine was split. Removed the rad and hoses..
Then set about making a bracket for the header tank. I moved the two connectors that are usually next to the fusebox, they are now down below at the back. Removed any other brackets that were no longer needed..
Then checked the lower hose would reach, inlet elbow would fit etc. All fine so welded it into place and gave it a coat of satin black so stop it rusting. Tank fits fine..
Moved onto the thermostat. Two types of housings available on the M52, plastic and aluminium. People say the aluminium ones are better, but they are known to crack at the casting points, as are the cheap plastic factor specials. Luckily this still had the composite plastic BMW housing on, so it can stay. It had a genuine thermostat too, maybe it was the original, it was certainly stuck in there..
New seal and 88deg thermostat..
Now I wasn't really convinced the thicker oil would cure the 'tapping' I was getting when the oil was hot, it has to some degree but not fully. At least I know what sort of temperature/pressure its running now though. Still, even though its a high milage engine I wanted to be sure the temperatures were consistent all the time. I already had an 16row oil cooler element from the E30 which I had kept, although the hoses were no use.
The M3s (S50) have an oil cooler standard, and have two take off's on the oil filter housing. Nothing like a sandwich plate setup as the BMWs use a paper filter inside a housing. I spent a while finding an S50 oil filter housing (M52 has a plastic cap and the S50 a metal cap, along with a different oil filter)..
vs the M52..
Once the alternator and power steering pump have been removed the entire housing can be removed from the block..
There are a few other differences between the two. The M52 has one M14 port (for the Vanos feed), and one M12 port for the oil pressure switch. Whereas the S50 has two M12 holes as the Vanos takes its oil from elsewhere (S50 on the left in the picture). I just swapped my M14 > AN4 fitting to an M12 > AN4 fitting and the Vanos line was as before.
The oil take off ports are ran from an internal thermostat as seen below, so the cooler is not circulating all the time which is handy. New gasket fitted..
The power steering pump mounting on the S50 is different also, it sits further back, so if you bolt up the M52 pump to the bracket the pulleys do not line up. Easily solved though. It needs spacing 15mm away from the bracket, then the pulleys line up fine. The M52 tensioner also bolts right up to the S50 bracket also.
So with the filter housing bolted up to the block, you need some way of feeding the cooler.
On the M3 there are two hardpipes that bolt to the housing with two seals. Many people tap these with a BSP or Metric fitting, but its hit and miss whether you get a leak free seal once done. Luckily you can buy an adaptor off the shelf which converts the standard BMW fitting to 10AN..
With the fittings now in place I needed to mount the cooler itself. Due to the way the E36 front end is designed there is no 'slam panel' as such, but just lots of bits that unbolt to remove the front end if required. I stuck to using these only, so the cooler mountings would come off at the same time if that ever needed to happen. The most commonly used place is behind the front grills. Decided to mount it from the top and bottom, with the hoses ran round behind the headlight. Plenty of room between the grills and fan..
Drilled two holes and mounted it central with some rubber bushes between the chassis and cooler..
Next I cut and welded two flat bars to either side with holes drilled for the cooler to mount to..
Before fitting the cooler I swapped the radiator supports that I mentioned earlier. You can see how the mounting points are closer to the edge on the new ones. Luckily only £4 from BMW.
Re-fitted the radiator with the standard rubber feet, then bolted the cooler into place..
Screwed in the new lower temperature fan switch also (Intermotor 50172), which cuts in at 88deg and out at 83deg. I wired this up to the standard wiring on the E36, so literally all the work is already done.
I then made up two hoses with AN10 fittings on either end, using the same process as the Vanos line. Really good stuff to work with, literally takes minutes to assemble to any length you want.
They run along the chassis rail, down behind the headlight and fit pretty well with the standard air box. Everything back on..
I ran the car up to temperature and bled the coolant system through with fresh anti freeze. Topped the oil up beforehand and checked for any leaks, all fine. Ran it for long enough for the oil thermostat to open and the oil cooler filled with warm oil, so everything seemed to be circulating fine. Hopefully this will keep temperatures more consistent especially when on track.
The only issue that seems to be causing slight concern at the moment is every time I remove the oil catch tank (which is linked to the crank case breather on the rocker cover) it is full with oil. The engine is breathing pretty heavily, which is odd as it pulls harder and smoother than it ever has. Can't find much information elsewhere about that yet, so I will just keep an eye on it. Need to compression test it too really.