Post by
BBISHOPPCM »
https://forums.nicoclub.com/bbishoppcm-u54071.html
Mon Oct 27, 2008 1:40 pm
What you are hearing is typical for any engine without hydraulic lifters. Don't panic. Instead of using hydraulic lifters (self-adjusting), most Nissan engines use a "shim-and-bucket" system, where the valves will require adjustment after about 60,000 miles. Simply put, a technician will determine how much play is between the cam lobe and lifter surface, and shim as needed.
The good; our cars will never require costly hydraulic lifter replacements, which often become excessively noisy on high mileage engines (or they can fail completely, causing serious engine problems).
The bad; Shim-and-bucket lifters (or "solid" lifters) are slightly noisy when cold, especially after the break-in period. Extra play is required to allow for thermal expansion; too much play will cause cam lobe damage and incorrect valve timing; not enough play will cause poor valve sealing, lower compression, burned valves, and ultimately, poor performance. Just the right amount of clearance is needed, and noise will occur when cold.
If you've ever heard a typical Datsun/Nissan four-cylinder engine, they all have a distinctive "sewing machine" sound. This is due to Nissan using solid lifters in these engines. Nissan uses hydraulic lifters in their V6 engines, and possibly some of the newer four-bangers. Also, if the noise becomes excessive (determined by a qualified mechanic,) adjustment may be necessary. This is considered "maintenance," (unless the car is less than a year old, and has under 30,000 miles or so), and due to the MR18DE's design, can be a costly service.
My suggestion? take it in to see of the noise is unusually loud, otherwise, consider it a part of Nissan's heritage of building noisy four-cylinder engines.
Every Nissan 4-cylinder engine I have ever owned sounds exactly like my Versa's. I've owned two 2.4l 1987 NAPS-Z engines, a 1992 2.4l KA24D, a 1999 1.6l Sentra, and a 2004 Frontier with a KA24DE.