KGauger
New Member
- Joined
- November 28, 2006
- Messages
- 9
- Reaction score
- 0
- City, State
- Carlton, GA
- Year, Model & Trim Level
- '91 Mazda Navajo
I have a '92 4.0L OHV Explorer with a clogged oil screen. And you have to pull the engine to remove the oil pan on '91 thru '94 Explorers. I tried to find a place that could preform an engine flush but no one in the area seemed to have such a machine. I did something that seems to help. Drain the oil and flush all the junk that you can from the oil pan.
You will need an extra or used oil filter. Put the drain plug back in and add about 2 quarts of kerosene to the oil pan. I added the kerosene thru the oil dipstick tube so it went directly into the oil pan. Remove the original oil filter. The idea is to backflush the oil screen. The oil normally is pumped thru the outside of the oil filter and then thru the inside hole to the engine. Plug the center hole where the oil filter screws in after removing the oil filter. Get an air tank or air hose. I punched a hole on an old oil filter the size so I could release compressed air into the oil filter. Screw the oil filter with the hole on the engine. Release air into the oil filter. You should hear air bubbling in the oil pan. The air is not only backflushing the oil screen, the bubbling action seems to help loosen some of the deposits. After pumping air thru the oil filter for a few minutes, remove the drain plug and drain the kerosene. After straining the kerosene, I flushed the oil pan one or two times by pouring the kerosene again thru the oil dipstick tube. The splashing action seems to help flush junk that is on the bottom of the oil pan.
Repeat backflushing with air and flushing with kerosene until no significant deposits are removed. Install a new oil filter and oil. If the oil screen has clogged once, expect the oil screen to clog again. Check the oil often and repeat this procedure when the oil is dirty or you lose oil pressure. If you used a motor flush product or have an engine where the oil has not been changed regularly, you may have to repeat this procedure several times until you remove most of the junk. You will get a good idea on how much junk is still present after backflushing the oil screen with air. Hope this helps.
You will need an extra or used oil filter. Put the drain plug back in and add about 2 quarts of kerosene to the oil pan. I added the kerosene thru the oil dipstick tube so it went directly into the oil pan. Remove the original oil filter. The idea is to backflush the oil screen. The oil normally is pumped thru the outside of the oil filter and then thru the inside hole to the engine. Plug the center hole where the oil filter screws in after removing the oil filter. Get an air tank or air hose. I punched a hole on an old oil filter the size so I could release compressed air into the oil filter. Screw the oil filter with the hole on the engine. Release air into the oil filter. You should hear air bubbling in the oil pan. The air is not only backflushing the oil screen, the bubbling action seems to help loosen some of the deposits. After pumping air thru the oil filter for a few minutes, remove the drain plug and drain the kerosene. After straining the kerosene, I flushed the oil pan one or two times by pouring the kerosene again thru the oil dipstick tube. The splashing action seems to help flush junk that is on the bottom of the oil pan.
Repeat backflushing with air and flushing with kerosene until no significant deposits are removed. Install a new oil filter and oil. If the oil screen has clogged once, expect the oil screen to clog again. Check the oil often and repeat this procedure when the oil is dirty or you lose oil pressure. If you used a motor flush product or have an engine where the oil has not been changed regularly, you may have to repeat this procedure several times until you remove most of the junk. You will get a good idea on how much junk is still present after backflushing the oil screen with air. Hope this helps.
