Thread: MN Triton EGR blanking plates mod.

Yes, but the source of the tar is not from the recirculated exhaust gas, it’s from the recirculated crankcase gases that contain a fine mist of oil which meets the EGR in the intake manifold. On contact with the superheated exhaust gas, the crankcase oil forms the crust that blocks the intake manifold.

Take the oil out of the equation, problem (largely) solved.

That’s always been my understanding, but I admit it is very specific to Toyotas and not other makes, however I believe the logic is fairly generic.

One thing I do know is that the 150 Hilux fleet on a mine site that I worked on for a few years had lots of problems with blocked EGR valves on 2-3 yr old vehicles. These vehicles basically run all day, most of the time stationary with the Aircon switched to max. So the amount of kilometres travelled versus engine operating hours is actually very low but the engines take a hiding from bad fuel and constantly idling. When the gold price crashed in 2013 the replacement plan for these vehicles was updated to add another two years operating time, and one of two main retrofitted maintenance items was an oil catch can (after stripping and cleaning the EGR, which was quite an expensive exercise in labour hours, but worth it... the guys got extremely good at it). The other item was adding a secondary 5 micron water trap type fuel filter. Three vehicles were selected for testing 12 months after the catch cans were installed, and found to be very clean.