The Nissan Juke Exhaust Valve expels burnt gases from the cylinder once combustion completes and seals to create compression for the next cycle. The Nissan Juke engine must have at least one intake and one Exhaust Valve per cylinder that opens and closes by the action of camshaft lobes through the valvetrain. In some engines of the Nissan Juke where the camshaft is located inside the cylinder head, the cam can act directly on followers or buckets. In addition, in configurations with the cam in the block, a lifter, pushrod and rocker arm move the Exhaust Valve. Using the correct valve spring pressure of 70 to 90 pounds seated and over 200 pounds open prevents the Exhaust Valve from opening until the exhaust stroke begins. If spring force weakens, valve float may prevent sealing, creating a risk of valve and piston contact with serious consequences. The risk of overheating is common as high temperatures could warp or crack the Exhaust Valve. This can reduce power and make the Nissan Juke engine run roughly.
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