When accelerating uphill there is a knocking sound coming from the engine

Good evening,

This sounds like a failure in the motor for oil pressure from getting stuck. The oil light coming on while the engine is running is the indicator.

https://www.2carpros.com/articles/high-or-low-engine-oil-pressure

You need to have someone test the actual oil pressure with a gauge to be sure there is pressure.

Roy

1. To remove the relief valve, proceed as follows:

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Fig. 116

2. Remove the threaded plug and gasket from the oil pump (Fig. 116).

CAUTION: Oil pump pressure relief valve must be installed as shown in (Fig. 116) or serious damage may occur.

3. Remove spring and relief valve (Fig. 116).
4. Remove oil pump cover screws, and lift off cover.
5. Remove pump rotors.

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Fig. 117

6. Wash all parts in a suitable solvent and inspect carefully for damage or wear (Fig. 117).

You are welcome.

Keep us updated.

Roy