Proper installation of the engine oil pan on the 2020 Encore GX and 2021 Trailblazer equipped with the 1.2L engine (RPO LIH) requires that the room temperature vulcanizing (RTV) sealant be correctly applied on the lower crankcase extension.
Before applying the RTV sealant, all sealing surfaces must be free of contamination. Do not allow cleaning solvents to contact the oil pump drive belt that is located close to the rail of the oil pan. Ensure that the inside edge of the lower crankcase extension is wiped clean of excessive engine oil to prevent contamination of the sealing surface after the sealant is applied and prior to oil pan installation.
On the 1.2L engine, the oil pan sealing surface on the lower crankcase extension has a small edge or groove. (Fig. 22)
Fig. 22
When applying a 4 mm (0.16 in.) bead of RTV sealant, it must be centered on and follow this groove. The following example shows the sealant properly applied to the lower crankcase extension. (Fig. 23)
Fig. 23
– Thanks to Raymond Haglund
