Originally Posted by 351xd
Ive Just installed new cam and lifters in my 351.
I just started running it in and had a pretty big water leak so had to stop after 5 mins but the Lifters are Insanely Noisy, they are crane anti-pump ups and ive set the preload as per the crane instructions using the standard rockers with shims.
Any ideas, do they just need to run in fully. After 5 mins at 2000-2500rpm im half deaf and that dont seem right to me , the same engine with the old cam and lifters was no where near as noisy
EDIT: The cam was installed 4 degrees advanced, also doesnt really feel like it wants to rev
The hydraulic lifters should make no notable noise. Did you set preload before or after priming the engine with oil? My concern is that you may have too much preload...but, other than valves smacking the tops of the pistons, I can't think what noise would be made...unless something else was screwy.
The primary sources for valve train noise in a hydro cammed engine are rockers whacking against the valve stems and a really loose (no/too little preload) set up. To make the noise you're describing, you'd have to be very loose, so much that you can feel room between the lifter and rocker when moving the pushrod up and down. Another is incorrectly installed poly-locks, assuming that you're using them...backing off and creating unwanted space...but that doesn't sound as if it is the case with standard (factory) rocker arms.
The only other thing that comes to mind is that the rocker body isn't clearing the retainer at some point in its travel. I'd look into it to see what you can see. Take off one of the rocker arms and look it over to see if you've got a new shiny spot. Look at the retainer too to see if there is a "dent" or other indication of wear. That is the only thing that I can think of where you could run it for 5 minutes and likely not have something catastrophic happen.
Something else that you can do when posting is be sure to include your camshaft details, as these can sometimes point out the obvious rather quickly.
I definitely do not recommend further running until the problem is found and fixed.