Engine - Oil Dipstick Calibration Correction

Bulletin No. T 85-94
File in Group 6A
Number 73
Corp. Ref. No. 8054267
Date July '85
SUBJECT: HT4100 ENGINE OIL DIPSTICK CALIBRATION

MODELS AFFECTED: 1985 FRONT WHEEL DRIVE DEVILLES AND FLEETWOODS

FIGURE 1 DIPSTICK CALIBRATION:

HT4100-equipped 1985 Devilles and Fleetwoods built before Vehicle Identification (broadcast) Number 372276 may have been manufactured with incorrectly calibrated engine oil dipsticks. These dipsticks will read approximately 1/2 to 3/4 quart low when the correct amount of oil is in the crankcase (see Figure 1). Vehicles manufactured after broadcast number 372276 have dipsticks that are correctly calibrated. These new dipsticks can be identified by the new part number (1634398) stamped on the stick.

FIGURE 2 DIPSTICK TUBE LENGTH:

If you encounter a condition of incorrect dipstick reading on an early vehicle, the dipstick tube length should be measured as indicated in Figure 2. If this dimension is 6-1/4 to 6-3/8 in., the tube is correct and the dipstick should be replaced with a new dipstick. If the tube dimension is less than specified, replace the tube according to the procedure in the Service Information Manual and install the new dipstick.
Parts Information

PART P/N

New Dipstick 1634398
Dipstick Tube 1631240

Warranty Information

For warranty purposes, use only one of the following labor operations:

Description Labor Operation Labor Hours

^ Measure tube and J0920 .2 replace dipstick

^ Replace tube and J0930 .2 dipstick