Installed a new fan clutch on the old Mercedes. I figured 325K miles was enough for the old one.
I've changed these before (on other MBZ diesels), and had this one apart a couple of times. Its a minor PITA to get it bolted up to the water pump. So I came up with a new technique:
Sawed the heads off of some M8-1.25 bolts to make studs...
Set the fan/clutch assy onto them. I had done it before with a single bolt on the bottom, darn thing wiggles around too much. 3 studs and its stays in place in that axis - used a piece of foam rubber between the radiator and the front of the clutch to hold it up.
THEN I was able to get the first bolt in with comparatively little trouble.
Removed the studs one at a time, placed bolt in hole (which *BARELY* fits in), apply a bit of inward pressure on the bolt head with a small flatblade screwdriver, and use a skinny 10mm open end wrench to get things started. Note disconnected sensor in this picture...
Took it for a test drive - its been running slightly hot ever since I changed the T-stat a couple of months ago. This didn't make any difference whatsoever, so it looks like I'm going to throw the old T-stat back in as a test. HOWEVER - I didn't notice the disconnected sensor at the time - I just saw it when I was post processing these pictures! So I get to try it again tomorrow before I do anything else. I suspect it isn't going to make any difference, but this *is* a thermal switch for the electric fan on the front of the radiator, so I better check it with it on first.
Both T-stats are 80 degree C - the new one is a Stant, which I respect - but the car ran at about 82 all day long with the old one - it now wants to run 92 with the new Stant. "Hecho en China" on the Stant - maybe that's the problem? We'll see what tomorrow's test drive shows, if anything.