Which valve corresponds to the long and short valve springs on the EA888 engine?
2 Answers
Exhaust valves have long springs, while intake valves have short springs. Below are specific details regarding valve springs: Check the free length of the spring: Use calipers to measure the free length of the valve spring, which should match the standard value. If it does not, replace the spring. Check the spring's vertical alignment: Use a square ruler and a flat surface to inspect the vertical alignment of the valve spring, ensuring it meets the standard value. If not, the spring must be replaced. Check the spring's preload: Use a force gauge to measure the preload of the valve spring, which should conform to the standard. If the preload is below the standard value, replace the valve spring. Frequent compression: To prevent damage, the spring should be compressed regularly.
Regarding the length difference of EA888 valve springs, based on my disassembly and repair experience, the intake valve springs are generally longer while the exhaust valve springs are shorter. This design distinction is crucial because during EA888 engine operation, exhaust valves face high temperatures and high-pressure exhaust gases - the shorter springs are stiffer, ensuring effective sealing. Conversely, the longer, softer intake valve springs facilitate rapid opening/closing and improve airflow. If incorrectly installed (e.g., short springs on intake valves), it may cause power loss or abnormal noises. For replacement, verify free lengths: ~38mm (longer) for intake valves, ~35mm (shorter) for exhaust valves. Regular valve assembly inspections prevent premature wear and maintain engine performance. Always distinguish them correctly when servicing EA888 engines - it's vital for long-term engine health.
