Iron scale experiment
A little history first, from 2004-2008 I've had the original oil cooler. Then in 2008 I had studs and other work done to the truck including new oil cooler (cooler #1). In 2009 I installed a coolant filter. July of 2011 my deltas were out of spec, so a new oil cooler (cooler #2) was installed. Fast forward to May 2012 replaced another oil cooler (cooler #3) do to delta being out of spec. So the cooler i have in now is cooler #4. When cooler #3 was installed I did a complete flush with VC-9 and Restore along with a butt load of flushing, this was done in order to switch to ELC.
Now cooler #1 I did not cut open to check the blockage. Cooler #2 was cut open,found yellow blockage and at the time I thought I was also dealing with casting sand, but it was iron scale. Now prior to removing cooler #3, I tried back flushing the cooler to see of I could salvage it (wishful thinking). I was able to get some of the iron scale out and into the bottom of the bucket, but not enough to make a delta difference. So out came cooler #3, which I put a magnet in the coolant passage and pulled out some iron scale.
So before I pulled out cooler #3, I did a coolant flush and back flushed every coolant passage I could get my hands on (degas, heater core, block plugs, back of heads, oil cooler feed port, ect, ect). There was hardly any iron scale in the bucket, just a couple of flecks.
As of last week end, oil cooler #4 is in the truck. Just to be sure I got out all the iron scale, I taped 4 high powered magnets to the lower radiator hose. I'm gonna drain the coolant next Wednesday to check the ID of the hose for iron scale. What my plan is, if I find iron scale, I'm gonna back flush the oil cooler with 50/50 ELC in hopes of keeping the passages freed up. If I don't find any scale, I'll just keep draining and checking the lower radiator hose every week for the next 4 weeks.
Wish me luck, Rich
2004 F350 CC DRW King Ranch
X-3 tunes by DJ'S,QT,GH,ID. Gryphon FICM tunes, ARP studs,Stage 1turbo,ATS coolant recirc lines,Swamp's 48v ficm,coolant filter,AD2,Snow Perf stage II,EGR delete,4" turbo back straight pipe,S&Bintake,Quad "A" pillar autometer gauges,Suncoast Tri Disk Conv.,Billet input shaft,Suncoast superduty rebuild kit,Trans-go shift kit,Mag-Hytec trans pan,CFM+ elbow,ccv mod,15K reese 5er,17" LCD TV/DVD,Cobra 29 Nitewatch CB
Last edited by Lilpooh; 05-30-2012 at 08:49 AM.