View source for Flushing the 3S-GE With Diesel

Flushing engines with diesel is, from what I can make out, an 'old skool', but very effective, way of decarbon-ing an engine. Diesel is a lubricant so it wont damage an engine if used correctly. If the oil pressure telltale on the dash is extinguished then there is enough oil being lifted by the oil pick-up in the sump and it is creating enough pressure to enable no contact between the shell bearings in the engine. If the telltale is illuminated then there is not sufficient pressure being created and terminal damage can occur. In this case the revs must be increased to the point where the telltale is extinguished (possibly around 1100/1200RPM, every engine differs).

This is an unrecognised procedure through all dealers as it will invalidate the warranty of any parts concerned, also because the Diesel oil falls well below any viscosity recommendations made by Toyota for engine lubricants. If you decide to carry out this procedure it is solely your choice I will take no responsibility for any damage caused by or as a result of this procedure. I dont know how good this will work on turbo or non standard internal engine parts.

When working with diesel or any fuel and oil please be careful not to expose bare skin for prolonged periods of time as most solvents and oils are carcinogenic and cause irreversible damage to unprotected skin. I would suggest using nitrile gloves as these don't disintergrate/weaken when in contact with diesel. I also suggest after working on your vehicle to ensure thoroughly cleaning your hands with an appropriate hand cleaner such as Jizzer or Swafega. Take care of your hand you only get two!!

Menu:- 

8 Litres of Diesel Fuel (Straight out of the pumps)

4 litres of Engine Oil

3 Engine Oil Filters (90915-YZZJ1)

1 Sump Plug Washer (90430-12031)

Method:-

Be warned the oil/diesel and engine components WILL get hot and ultimately have the potential to cause burns, please take care

Points noted with a (*) should be repeated for best resuts

* Run engine until warm (Cooling fan cuts in and out twice)
* Remove sump plug
* Drain bad engine oil & Filter
* Refit sump plug (without washer)*
* Fit new oil filter*
* Remove oil filler cap (O/S/R of rocker cover)*
* Pour 4 litres of diesel into the engine through the engine oil filler.*
* Refit Oil Filler Cap*
* Run engine with no loads at all on idle for 30 mins*
* Turn off engine*
* Drain diesel from sump, remove filter and leave sump plug out for 1hour*
* Fit new oil filter
* Refit sump plug (with washer) and tighten to 25Nm (18.4 Lb-Ft)
* Pour 4 litres of Toyota (or equivelant) engine oil into the through the engine oil filler.
* Replace engine oil filler cap
* Start engine and allow to warm up (cooling fan cut in and out twice)
* Stop engine, wait for 5 mins, to allow oil to settle in sump
* Check level with dipstick
* Top up oil as required
* Take her for a run revel in the silence and rest deep in the knowledge that it's all good for the next 4000-6000 miles