K Yukon/Denali 4WD V8-6.5L DSL Turbo VIN S (1999)
14. Remove the rear heater hose from the connector(if the vehicle is equipped with rear heat). Refer to Heater Hoses Replacement - Auxiliary
(Suburban-Front) in Heating and Air Conditioning.
15. Remove the valve rocker arm cover bolts from the cylinder head.
NOTICE: Prying on the valve rocker arm cover may cause damage to the sealing surfaces. Use a block of wood against the side of the valve
rocker arm cover and strike with a hammer in a sideways direction to shear the RTV sealant.
16. Remove the valve rocker arm cover from the cylinder head.
17. Remove the RTV from the valve rocker arm cover.
18. Remove all oil and grease from the sealing surfaces.
INSTALLATION PROCEDURE
NOTICE: Do not allow the RTV sealant into the valve rocker arm cover bolt holes. This may cause a "valve lock" condition, when the bolts are
tightened, damaging the cylinder head casting.
1. Apply a 5 mm (3/16 inch) bead of RTV sealant GM P/N 12345739 to the valve rocker arm cover, inboard of the bolt holes. The sealer must be
wet to the touch when the bolts are tighten.