Hello all,I have a1990,BMW 525i.I bought this car from another guy about year back and drive around 13000 kms.1.Do i need to adjust the valves(both inlet and outlet).2What is the importance of valve adjustment3Does it affect the mileage4.As a regular maintenance for how many kms can i drive without valve adjustmentExpecting your valuable replies.
Valve adjustments are something nobody does anymore. It really is important to do to, especially if your car is older. If your valves are adjusted to tight, you can wind up with burnt valves, too much clearance and it can quickly wear out the valvetrain. BMW reccomends inspecting valve adjustment every 24,000 kilometers. You may be able to do 30,000 Maybe more than that but I personally wouldnt. It will effect mileage a noticable amout, and your car can lose power if it has too many burnt valves. If a valve is burnt it isnt seating properly and you arent getting a fully sealed combustion chamber. It is a fairly easy maintence that you can do yourself. You need a feeler gauge to check the valve lash. you will need to remove your valve covers, (you might as well replace your valve cover gaskets lest they get leaky) and find top dead center for each cylinder as you can only check valve lash at TDC. You will need a shop manual it will tell you what the measurements should be, and give a step by step method to checking your valves. If that sounds like too much work, just take it to a BMW dealer. To those of you that think that you can let it go until it makes noise.... The idea is to keep it from getting to that point. It is a relatively easy thing to do.
um...yes, no,,no and yes. no really all i know is correct clearance is important and if incorrect, it can do some damage. it does affect mileage, and both intake and exhaust need adjustment and i would recommend a professional technician. it is sometimes difficult for even a pro to adjust valves. i don't do it often at work, but had some trouble on my own car. had to remove the cover and change a couple cuz they were noisy after made the first adjustment.
if it needs to be done DO IT. valve clearance is very imporant. the sound of a valve hittin a piston isnt good. especially if you bend a valve which you will. valve adjustment isnt hard if you kno bout cars a little bit.
Benefits Of Valve Adjustment
If your engine is silent,u dont disturb the valve clearances. if your maintaing the car with dealers or qualified mechanics,they will tell you if valve adjustments are required. so dont worry much.
