So , lately you all know my timing belt fiasco. Anyway, the mechanic who fixed my loss of power and rough idling issue, insists my engine has rod knock.
So here are the clues.
1. When the engine and oil is cold, no such sound.
2. When oil warms up to 70C and above, the metallic rattling begins, only when there is load on the engine, pulling in gear 2 or 3. Yes it does rattle too in 4th and 5th although much less because the rpm is usually above 2500. In short, low rpm (1500 - 2400) under load, rattles.
3. Oil pressure seems adequate, although just a bit low from actual spec. Its supposed to be 21psi at 90C at 900rpm. I get 18psi.
4. Mechanic insists the ignition timing is now set correctly. Previously I retarded the distributor, and increased the carb idle speed screw to get back 900rpm idle speed. I have been running the car this way for years. It does keep the rattling/knock sound to a bare minimum this way.
5. My UOA shows about 20 to 25ppm of lead for 10000 to 15000km OCI.
Next, could detonation or pinging cause the rod bearings to wear early?
Also could lugging the engine cause this ?
So here are the clues.
1. When the engine and oil is cold, no such sound.
2. When oil warms up to 70C and above, the metallic rattling begins, only when there is load on the engine, pulling in gear 2 or 3. Yes it does rattle too in 4th and 5th although much less because the rpm is usually above 2500. In short, low rpm (1500 - 2400) under load, rattles.
3. Oil pressure seems adequate, although just a bit low from actual spec. Its supposed to be 21psi at 90C at 900rpm. I get 18psi.
4. Mechanic insists the ignition timing is now set correctly. Previously I retarded the distributor, and increased the carb idle speed screw to get back 900rpm idle speed. I have been running the car this way for years. It does keep the rattling/knock sound to a bare minimum this way.
5. My UOA shows about 20 to 25ppm of lead for 10000 to 15000km OCI.
Next, could detonation or pinging cause the rod bearings to wear early?
Also could lugging the engine cause this ?