I just finished rebuilding my 152 and got it in the truck ran great for about 15 miles and then it started making noise sounded like a rod bearing but as I ran it and listened around it has started to quiet down it can be heard through all rpm's and the noise seems to be most noticeable using a stethoscope on the top of the engine toward the rear and I have no idea what it could be it is fairly quiet now and the engine still seems to run fine (but I did park it). I am looking for any advice or ideas I really do not want to pull and rebuild again unless have to so I will provide a little background on the rebuild and see what people think.
This is not my first engine rebuild I have rebuilt a handful of dodge and Chevy motors and one IH 152 all successful. I had the head and block machined by a very good machine shop they bored it .040" over and installed new cam bearings. I reused the crank and cam because they were in good condition but I had to replace my lifters because they were mixed up by a falling box (this is the only thing I am worried about, mixing new lifters and old cam) I also replaced my rocker assembly with a good used one that I cleaned and refurbished using the thread on this website. I installed the rocker assembly by first torquing it down then installing the push rods I primed the entire system using directions from this site and had oil flow up to the rockers and about 40psi oil pressure I used engine assembly lube on everything broke it in using rotella 15w-40 and comp cams break in additive. The oil is still clean with no visible metal particulate.
If anybody has any ideas or advice please post.
P.s. I also measured all bearing and thrust clearances using the service manual for reference and torqued everything to spec
This is not my first engine rebuild I have rebuilt a handful of dodge and Chevy motors and one IH 152 all successful. I had the head and block machined by a very good machine shop they bored it .040" over and installed new cam bearings. I reused the crank and cam because they were in good condition but I had to replace my lifters because they were mixed up by a falling box (this is the only thing I am worried about, mixing new lifters and old cam) I also replaced my rocker assembly with a good used one that I cleaned and refurbished using the thread on this website. I installed the rocker assembly by first torquing it down then installing the push rods I primed the entire system using directions from this site and had oil flow up to the rockers and about 40psi oil pressure I used engine assembly lube on everything broke it in using rotella 15w-40 and comp cams break in additive. The oil is still clean with no visible metal particulate.
If anybody has any ideas or advice please post.
P.s. I also measured all bearing and thrust clearances using the service manual for reference and torqued everything to spec
