How to distinguish the length of Teana valve springs?
2 Answers
Teana valve spring length differentiation: the exhaust valve uses the long spring, and the intake valve uses the short spring. Teana valve spring inspection steps: 1. Check the free length of the valve spring, measure the free length of the valve spring with calipers, the value should conform to the standard. If not, replace it; 2. Check the verticality of the valve spring, use a square ruler and flat plate to inspect the verticality of the valve spring, the value should meet the standard, otherwise it must be replaced; 3. Check the preload force of the valve spring, use a dynamometer to test the preload force of the valve spring, the value should comply with the standard. If the preload force is below the standard value, replace the valve spring.
I've been repairing cars for many years, and the key to distinguishing the length of Teana valve springs lies in their position and testing. Generally, the intake valve springs are shorter, while the exhaust valve springs are longer because the higher exhaust temperature requires stronger spring force for control. After removing the engine cover, using calipers for measurement is more accurate: the shorter ones are about 25mm, and the longer ones are around 28mm. If you get it wrong, the valves won't close tightly, leading to compression leaks, severe engine shaking, a sharp increase in fuel consumption, and accelerated wear on parts. Once, I almost mixed them up, so I followed a sequence during disassembly and installation: take photos of the original positions and measure the height difference before replacing with new parts. The springs on the intake side are shorter, while those on the exhaust side are longer—remembering this makes the job easier. Regularly check for spring aging to prevent misidentification and improve driving smoothness. When replacing old parts with new ones, avoid mixing batches, as differences in springs can affect overall performance.
