RB25DET has a very faint tick to it ....PLEASE HELP!!!

[Custom vert]

sorry guys i have looked at every other simalar post like mine but they are not quite the same an i need help bec i cannot figure out what this noise is an i have recently had the top end rebuilt to stock an machined an the turbo rebuilt but i still hear this ticking noise an it sounds like it is comming from the bottom end an i drained the oil an checked th eoil with a high powered magnet an cant find any metal shreds in it an its got me puzzzzzled an you really cant hear until there is load on the engine an most people dont hear it until i spot it out to them or if your in the cab an im not sher if it is a con rod bearing or not ????????????????????????

thanks,

[Krazykouki]

No knock meter?

The first few layers of a bearing are not magnetic. If there is bearing material in your oil, it will look like there has been Copper Gasket spray in your oil. The easiest way to look for bearing material is to get a cup of the oil and run it through a coffee filter and or cut open the used oil filter.

My 25 has a tick at idle but its just the annoying lifters.

[Custom vert]

ok thanks an so your saying its not the nock meter ? an even knowing i just got the top end of the rb rebuilt an fresh you think it could still be a lifter problem

[ItzGenX]

Cut open the oil filter too. Often when a bearing first begins to loosen up, the particles are too small to get caught into the pickup strainer and pan. Like posted earlier also, it will not be magnetic. The important top layer of a bearing is often made of non magnetic babbitt metal which resembles lead and copper. When you get magnetic chips in your pan, it's already clearly heard and too late. Magnetic bearing chips mean you have made it down to the base metal of the bearing well into the copper layer.

BTW, just because the head has been rebuilt, doesn't mean it will be quiet. Chances are they didn't replace the lifters. Light ticking can be anything from a coil firing, lifter, or even the injectors. You have to be first sure of where the sound is coming from before you can truly diagnose it from a computer.