1. Incorrect Oil Pump Installation: Ensure the oil pump is correctly installed and seated properly. Sometimes, improper installation can lead to oil pump failure, resulting in lack of oil flow to the rocker arms.
2. Clogged Oil Filter or Passages: Verify that the oil filter is new and clean, as a clogged oil filter can restrict oil flow. Additionally, check for any blockages or obstructions in the oil passages or galleries that may impede oil flow to the upper part of the engine.
3. Insufficient Priming: Before starting the engine for the first time, it's crucial to prime the oil system adequately. This ensures that the oil pump is filled with oil and ready to circulate. Follow the proper priming procedures recommended in the engine manual.
4. Broken Oil Pickup Tube: Check the oil pickup tube for damage or cracks, as a compromised pickup tube may prevent the oil pump from drawing oil effectively from the oil pan.
5. Faulty Oil Pressure Relief Valve: A malfunctioning oil pressure relief valve can cause the oil to bypass the rocker arms and return directly to the oil pan. Inspect the oil pressure relief valve and replace it if necessary.
6. Mechanical Issues: In some cases, the lack of oil flow to the rocker arms can be caused by mechanical issues such as worn or damaged camshaft bearings, faulty lifters, or other problems with the internal oil passages of the engine. It might require further inspection and repair by a qualified mechanic.
If you've gone through these checks and still encounter oil pressure but no flow to the rocker arms, it's advisable to consult with a professional mechanic for further diagnosis and resolution.
