Camshaft and rockers — inspection and maintenance (Peugeot 305)

1. Inspect the camshaft lobes for wear and damage. At the same time, inspect the rockers for wear, especially in those places where they rest on the camshaft lobes. If there are obvious defects or dents on the thrust surfaces of the rockers or cams, the defective parts must be replaced. If the cam and rocker surfaces are still clean, bright, and pit-free, although they show some minor signs of wear, it is best to leave them alone. Regrinding of thrust surfaces is prohibited, as it will reduce the thickness of the hardened layer and accelerate wear of the parts.

2. The camshaft journals should be in good condition and not particularly worn, as they are subject to almost no stress.

3. If the camshaft bearings are obviously worn or discolored, the camshaft may need to be replaced. Have a specialist perform a precise check of the camshaft and cylinder head.

4. The rocker mechanism can be disassembled after removing the set screw on the support block on the side opposite the camshaft sprocket (see Figure 1.15, noting the difference between the blocks). Disassemble the rocker mechanism, laying out its parts in order for cleaning and inspection.



5. Inspect the rocker shaft for signs of wear and check it for warpage by rolling it on a flat surface. Axle warpage is unlikely, but if it does occur, the axle should be straightened or replaced. There should be no protrusions on the axle surface caused by wear. Inspect the oil holes and clean them if they are clogged.



6. Check the rockers for bearing wear by moving them to an unworn part of the axle. Inspect the oil spray holes and make sure they are not clogged. Inspect the ends of the valve clearance screws for cracks or signs of wear. Defective screws must be replaced.



7. The rocker mechanism is assembled in reverse order. Lubricate all bearing surfaces with clean engine oil, except for the rocker thrust pads, which should be lubricated with Molykote after the rockers are installed on the cylinder head. Check that all parts are installed correctly.