| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|
| Visually check for any leaks that could have caused the high consumption.Check that there is no engine oil in the coolant, also check that the exhaust tail pipe is not dirty with oil and check that there are no bluish exhaust fumes | Move on to Step 1 | 1. Obvious oil leaks.2.Engine oil in the cooling circuit.3. Exhaust tail pipe dirty with oil.4. Presence of bluish exhaust fumes. | 1. Locate and eliminate the oil leaks.2. Move on to Step 1.3. Move on to Step 1.4. Move on to Step 1. |
| 1 | CYLINDER HEAD OIL PENETRATION CHECK | All OK | Problems encountered | Operation |
|---|
| Remove the head and check:- no carbon deposits in the combustion chambers and on the inlet valves
- no wear on the valve stems
| Move on to Step 2 | Excessive clearance between the valve stem and valve guide and between the valve stem and oil seal | Replace the damaged/worn components Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL |
| 2 | ENGINE OIL PENETRATION CHECK | All OK | Problems encountered | Operation |
|---|
| Check the piston seals, in particular:- that they are not broken or damaged;
- that the seals are correctly fitted;
- that there is no seizing in the piston ring grooves.
| Move on to Step 3 | 1. Piston rings damaged or seized.2. Piston rings not correctly fitted. | 1. Replace the pistons, gudgeon pins and rings.2. Fit the piston rings correctly. |
| 3 | CYLINDER BORE CHECK | All OK | Problems encountered | Operation |
|---|
| Check:- the condition of the surfaces and the dimensions (ovality/taper) of the cylinder bores;
- piston-bore fitting clearance.
| End of diagnosis | 1. Bore surfaces do not conform.2. Dimensions outside of the tolerance.3. Fitting clearance not correct. | 1. Regrind the cylinder bores.2. Regrind the cylinder bores.3. Replace the pistons, gudgeon pins and piston rings following the fitting clearances. |
