Does the 1998 Nissan Frontier 4-cylinder have a timing belt or timing chain?
The 1998 Nissan Frontier 4 cylinder 2.4 engine has a timing chain as well as a tensioner assembly that over time will wear and need replacement!
Nissan Frontier's model years 1998-2004 with a 4cyl motor utilizes two timing chains. One large chain and one smaller chain. This allows the dual overhead cam to operate in sync with the crank shaft. P/N: 13028 = Large Timing Chain P/N: 13028-A = Small Timing Chain Here is a diagram of the setup. http://www.courtesyparts.com/images/d22u/d22u_130-1.gif