Just finished converting the OEM dual cooler to OEM Heat exchanger (From Monkeywrench Racing)
Firstly I removed the oil lines and then sandwich plate.
Drained as much oil as I could be bothered.
Took one of the 5/8th fittings out of the sandwich plate and connected the two lines.
I added a bit of padding and zip tied them out of the way.
There is a key/tongue on the heat exchanger that is meant to fit into a pocket on the block. Mine seemed to bottom out about 3mm away from flush.
So I cut about 4-5mm off the tongue.
Removed the aluminium U joiner from the coolant lines. (I didnt know this was a common failure point and it looks like mine was wearing through)
This was the hardest part pf the job. I ended up pushing a small allen key up between the ali and hose and work it around until I could get it moving.
Installed the fitting to retain the heat exchange. Attached coolant lines. Installed the filter.
It took about 4 hours.
What I did manage to do is an oil and water warmup time on the stock Dual Oil Cooler setup before doing the swap. Thermocouple mounted to the bottom edge of the oil filter.
Then I did another with the heat exchanger.
After 27mins - Oil at 160F, Water at 203F
10 mins for water to get to 162F
After 19 mins - Oil stable at 182F, Water at 203F 27mins
7 mins for water to get to 162F
Note: Fans didnt come on with Dual Coolers after 27 minutes. With heatexchanger they came on at 15mins 217F and turned off at 23mins 212F and dropped to below 200F
WHich is weird so im guessing there was air trapped in the system that purged through maybe?