Here are a couple google results:
#1_ " Cleaning/flushing an old engine may lead to other disaster. If you still insist, here is my "pro" guide for you:
Using kerosene engine flush
1. Drain oil except one quart, or you can drain all the oil and add one quart of new oil. (Starting with a NEW oil filter is recommended).
2. Add the remainder as kerosene, approx. 3 quarts.
3. Start the engine. DO NOT REV THE ENGINE
4. Let it run until warm, not HOT, just warm. About 5-10 mins.
5. Drain the entire contents, during or just after you can continuously pour kerosene into the engine until it comes out clear...
6. Add one quart oil, 3 quarts kerosene.
7. Run the engine again until slightly warmer. DO NOT REV THE ENGINE
8. Drain the entire system.
9. Again if you think it requires, you can pour Kerosene into the NON-running engine as it drains out until it comes out clear.
10. Pour about one quart of oil and let it run out of the oil pan.
11. Add your favourite oil/oil filter.(replace oil pan plug...)
12. Run engine until it�s at operating temperature. Check to make sure it is running ok.
13. Optional...You can drain the system one last time and add new oil filter and oil...
Dont try on high mileage cars, in an old engine you really don't want to remove all the deposits. Some of these deposits help seal rings, lifters and even some of the flanges between the heads, covers, pan and the block, where the gaskets are thi " (thin?)
#2_ " Ok I finished it all up. Went down to the local gas station and filled up a 5 gallon can of kerosene. Needed some for my heater anyway.
Used 1 quart of kerosene for the flush. Bought 6 quarts of Motorcraft 5w30 and MC filter. My truck takes 5 quarts but I used the 6th quart to help drain any excess kerosene out of motor. I left the drain plug out for this part.
Truck ran fine with the kerosene in. Just let it idled for approx. 10 mins. Never made any funny noises, smells etc...
Man when I did drain the kerosene, holy crap!! some unholy black sludge crap come slopping out the drain plug. Not a huge amount but enough to make me say holy **** out loud. I can say for sure the truck does run quieter. My truck used about 1/qt of oil per 1000 miles so I'll keep an eye on the consumption.
Would I reccommend this for every car? probably not because if the vehicle is heavily sludged, I can see how the oil pump screen can get clogged and grenade the engine. Would I reccommend it for preventative maintence? sure! use at your own risk. I wouldn't suggest more than 1qt of kerosene at a time for a flush. -Mike- "
There are oodles of results for "kerosene engine flush" on google.