Service Manual Update for 2000-2001 L Series L81 Engine Service Manuals Regarding Thread Sealant Application to Thermostat Housing Bolts During Installation

The purpose of this bulletin is to update all 2000 and 2001 L-Series (L81) Engine Service Manuals at your location.

Please obtain all the 2000 and 2001 L-Series (L81) Engine Service Manuals and make necessary updates as indicated below.

1. On page 831 of both service manuals, locate step 1 of the "Thermostat Inlet Housing and Element" installation procedure.
2. Write in the following after the second bullet:

Apply thread sealant PST 565® (or equivalent) to bolt threads.

3. On pages 748 of the 2000 L- Series and page 745 of the 2000 L-Series (L81) Engine Service Manuals, locate step 1 of the "Coolant Outlet Housing and Thermostat (Unit Repair)" installation procedure.
4. Write in the following after step 1:

Apply thread sealant PST 565® (or equivalent) to bolt threads.