Usage:
3406 (92U),
3406B (7FB, 8TC, 4MG, 5YG, 3ZJ, 5KJ),
3406C (3ZJ, 5KJ, 8PN),
3406E (5EK) Truck Engines Except 3406B (2EK) PEEC And 3406C (4CK) Electronic Engines Equipped With Front Sump Oil Pan
The approved oil capacity for the above truck engines has been increased to 40 quarts or 10 gallons. Formerly the capacity was 36 quarts or 9 gallons. The new 120-8972 Oil Level Gauge (dipstick) is available to retrofit MOST existing engines to measure the increased capacity. The new dipstick will fit both front and rear sump non-Brake Saver applications. The new dipstick is NOT a full range dipstick. There are NO oil level marks or crosshatch on the new dipstick. Since each application is different, the location of the "FULL" and "ADD" marks will vary. Use the "120-8972 Oil Level Gauge Calibration Procedure" to establish the "FULL" and "ADD" add marks on the new dipstick.
The new calibration procedure is for the 40 quart "FULL" mark with a 34 quart "ADD" mark. The new calibration procedure was created to minimize errors related to drain back time by compensating for oil that is hung up in the cylinder head. The new procedure also takes into account the oil that is not measurable in the deep sump because it is trapped in the shallow sump.
The new oil capacity, dipstick, and dipstick calibration procedure can help alleviate some oil consumption complaints by increasing the effective operating range by two quarts and by improving the dipstick accuracy. The perception of excessive oil consumption can be changed by expanding the size of the operating range. The expanded operating range will help decrease the number of oil additions into an otherwise healthy engine during the oil change period. The chance of overfilling will also be reduced. Some complaints of excessive oil consumption can be directly related to overfilling caused by misinterpreting the full range dipsticks.
120-8972 Oil Level Gauge (Dipstick) Calibration Procedure
This procedure will calibrate the 120-8972 Dipstick to accurately register a 40 quart FULL capacity and a 34 quart ADD capacity on 3406, 3406B, 3406C, and 3406E Truck Engines.
NOTE: This procedure should NOT be used on 3406B PEEC and 3406C Electronic Engines equipped with a front sump oil pan.
1. Drain a hot engine for 20 minutes. Remove BOTH shallow sump and deep sump drain plugs.
2. Remove the oil filter.
3. Install the drain plugs removed in Step 1.
4. Install a new DRY oil filter.
5. Add 28 quarts (7 gallons) of CF4 oil to the engine at locations 1, 2, or 3. ONLY THESE FILL LOCATIONS SHOULD BE USED WITH THIS PROCEDURE. (See the illustration.)
Locations to add oil for dipstick calibration. Location 3 is one of three plugs in unused oil level gauge locations.
6. Install the new 120-8972 Dipstick into the guide tube. Then remove the dipstick and NOTE the oil level on the dipstick.
7. Mark this level on the new dipstick as "ADD" with an engraving pen or other comparable tool.
8. Add 6 quarts (1.5 gallons) of oil to the engine at locations 1, 2, or 3. ONLY THESE FILL LOCATIONS SHOULD BE USED WITH THIS PROCEDURE. (See the illustration.)
9. Install the new dipstick into the guide tube. Then remove the dipstick and NOTE the oil level on the dipstick.
10. Mark this level on the new dipstick as "FULL" with an engraving pen or other comparable tool.
11. Add 6 quarts (1.5 gallons) of oil to the engine for a total fill quantity of 40 quarts.