OIL LEVEL CHECK
See Figures 1 and 2
Check the engine oil level every time you fill the gas tank. The oil level should be above the ADD mark and not above the FULL mark on the dipstick. Make sure that the dipstick is inserted into the crankcase as far as possible and that the vehicle is resting on level ground. Also, allow a few minutes after turning off the engine for the oil to drain into the pan or an inaccurate reading will result.
- Open the hood and remove the engine oil dipstick.
- Wipe the dipstick with a clean, lint-free rag and reinsert it. Be sure to insert it all the way.
- Pull out the dipstick and note the oil level. It should be between the SAFE/FULL (MAX) mark and the ADD (MIN) mark.
- If the level is below the lower mark, insert the dipstick and add fresh oil to bring the level within the proper range. Do not overfill.
- Recheck the oil level and close the hood.
OIL AND FILTER CHANGE
See Figures 3, 4 and 5
The oil should be changed more frequently if the vehicle is being operated in very dusty areas. Before draining the oil, make sure that the engine is at operating temperature. Hot oil will hold more impurities in suspension and will flow better, allowing the removal of more oil and dirt.
Though some manufacturers have at times recommended replacement of the filter at every other oil change, the editors of this information recommend the filter be replaced with each engine oil service. The small amount saved by reusing an oil filter rarely justifies the risk. A clogged or dirty filter may fail to protect the expensive internal parts of your engine.
You will need a container which is capable of holding a minimum of 7 quarts of oil for gasoline engines or 9 quarts for the diesel. A container which is larger than the oil capacity is recommended so that it can be easily slid out from underneath the truck without the danger of spillage.
Loosen the drain plug with a wrench. Unscrew the plug using a rag to shield your fingers from the heat. Push in on the plug as you unscrew it (this should prevent oil from escaping past the threads until the plug is removed). Once the plug is unthreaded, quickly pull it and your arm back, away from the hot oil. Watch the oil drain and, if necessary, move the pan to keep underneath the stream of oil. Be careful of the oil. If it is at operating temperatures it is hot enough to burn you.
Give the oil sufficient time to drain in order to assure you have removed the most oil and dirt possible, then carefully install the drain plug. Make sure the plug is properly tightened, but DO NOT overtighten the plug as the threads are easily stripped. It would be better to leave the plug a little loose, than to overtighten and strip the threads, just be sure to check the plug for looseness or seepage after the engine has been fully warmed.
See Figure 6
Some early models were equipped with a cartridge type filter located in a canister on the side of the engine.
- Place a drain pan under the filter housing.
- Remove the filter housing bolt and lower the housing containing the cartridge.
- Remove the cartridge from the housing and dispose it.
There are springs and washers located on the bolt. Be careful to avoid losing them.
- Insert the new cartridge in the housing. It's a good idea to replace the housing O-ring or gasket.
- Make sure that the old O-ring or gasket is not still partially on the housing or mounting bolt. Scrape the housing and bolt with a suitable tool, for better seating of the new gasket/ring.
- Position the housing on the base and install the mounting bolt.
- Fill the crankcase, then start the engine, let it idle for a few minutes, shut it off and recheck the oil level.
- Check the floor beneath the vehicle for any leaks.
See Figures 7, 8 and 9
To remove the filter, you may need an oil filter wrench since the filter is often fitted tightly and the heat from the engine may make it even tighter. A filter wrench can be obtained at an auto parts store and is well worth the investment, since it will save you a lot of grief. Loosen the filter with the filter wrench. With a rag wrapped around the filter, unscrew the filter from the boss on the side of the engine. Be careful of hot oil that will run down the side of the filter.
The diesel has 2 oil filters. Change both at the same time.
- Make sure that you have a pan under the filter before you start to remove it from the engine; should some of the hot oil happen to get on you, you will have a place to dump the filter in a hurry.
- Wipe the base of the mounting boss with a clean, dry cloth.
Make sure the old filter gasket was removed with the filter and is not left on the engine adapter. If the old gasket is left in place, you are almost assured to have an oil leak.
- When you install the new filter, smear a small amount of oil on the gasket with your finger, just enough to coat the entire surface, where it comes in contact with the mounting plate.
- When you tighten the filter follow the part manufacturer's instructions. If none are provided, tighten it about 1 / 2 - 3 / 4 a turn after it comes in contact with the mounting boss.
See Figures 10, 11, and 12