I have just fitted new valve springs and the Exhaust Valve spring is under more compression than the inlet valve spring by around 4-5mm. Does anyone know if this is normal please. Keith L
Have you a spring seat fitted under one side only?
No, they are both sitting on seats. Keith L
I can only think that one valve is longer then the other. To be honest if it were me I wouldn't worry about it so long as the spring doesn't bind when the valve is fully open.
Good morning,
Are the valves the same length or is it the groove for the collets? Is one too long or the other too short?
Dave.
Thanks Idie and Dave. Food for thought. I have checked the parts list and found that the split collars for the inlet and exhaust are different part numbers. It is not possible to see the difference from the parts book illustration. Mine looked the same and I did keep them separated when I dismantled the valves. However the old springs were well mashed so I don't know if they were assembled wrongly. Keith
The valve stems are of different diameters, hence the difference in the colletts to fit the stems snugly. Try not to mix them up.
If you look very closely you will see that one set is slightly thicker than the other, these are for the inlet.
That still doesn't answer the spring compression issue tho.
If the spring sets are the same length then make sure they are sitting correctly inside the seats and that you do have matched collars and the collets are going into them fully.
Once fitted I usually whack the end of the valve stem with a "solid" hammer/drift to ensure everything is well seated and not about to fly apart when the engine starts up.
Thanks Pete C. Problem solved. Would you believe, I had one thick and one thin split collar on each valve! Once I put the thick ones on the inlet valve and the thin ones on the exhaust everything fell into place. Cheers. Keith L