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Q: What keeps the intake and exhaust valves closed?
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What is valve springs?

There are valves in the head of the motor. They open to let in air and exhaust out. There is a spring around each one that keeps them closed until the camshaft forces the valve open. Edit: Another way to put it is that the valve spring's job is to close the valve once it's opened by the valve train. The stronger the spring, the quicker it closes the valve and the higher the RPM the engine can operate without 'floating' the valves. The tradeoff is that the stronger the spring, the harder it slams the valve against the seat, reducing each's useful lifetime.


What keeps valves against their seats?

The valve springs.


What do the sphincter do?

It keeps the anus closed


What do valve springs do?

It closes and keeps the VALVES shut when needed.


Where are the camshaft valve seals on a BMW 325i?

The seals sit in the head of the motor. Each cylinder has 4 valves, 2 intake and 2 output valves, each valve has a semi rubber/metal seal that keeps oil from leaking into the combustion chamber. Replacing the seals requires removing the head from the motorblock.


What keeps blood flowing toward the heart in the largest veins?

Valves


What keeps bloods flowing toward the heart in the largest veins?

Valves


What is the exhaust system?

The exhaust system is what muffles the engine sound keeps the fumes out of vehicle and away from the vehicles occupants and also filters the exhaust fumes out.


What keeps blood from flowing backwards?

Pressure There are also one way valves in the circulatory system.


What keeps the fuel door closed on a 96 Chevy Corsica?

There is a spring on the fuel door hinge that keeps the fuel door closed. I hope this info helps.


What do you call a person who keeps to themselves?

closed off


What flap of tissue keeps the blood flowing in the wrong direction?

These are valves, and are found in veins to prevent blood from flowing backwards.