Please help me figure out this noise

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Please help me figure out this noise

Post  bb429power on December 13th 2012, 2:23 am

Okay I just rebuilt this engine, all rockers are zero lashed then quarter turn, headers and exhaust. I heard this noise before I rebuilt it as well and that was with pedestal mount rockers (I checked, they were torqued good before taken off) and it had manifolds. To me, it sounds like the rockers are loose, but I don't understand how they would be after going over each individual one twice. Could it be something else by chance? Any suggestions on what to do/check for? Thank you for any input. You'll probably need to turn your volume up a bit. And this was soon after the initial start...

http://s976.beta.photobucket.com/user/bb429power/media/2012-12-09_17-41-49_257-1.mp4.html
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Re: Please help me figure out this noise

Post  1970 ford maverick on December 13th 2012, 10:13 am

Have you check the rocker to valvecover clearence? I had my rockers hit them before and it sounded like my valves were out of adjustment,just a thought. MavMan
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Re: Please help me figure out this noise

Post  dfree383 on December 13th 2012, 10:25 am

what cam? and valvetrain parts? 351W?

Also check for a cracked or leaking emissions tube
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Re: Please help me figure out this noise

Post  bb429power on December 13th 2012, 11:55 am

its a 5.0, the heads are some old 4bbl heads that used to be on the maverick. Stock rocker arms with studs. The emissions tube was removed since it wouldn't work with these heads. The cam is a hydraulic roller, mountaineer/explorer cam. maybe I need more preload with the roller setup than a flat tappet? I will also try to check my clearances on the drivers side, as a lot is needed to check the passenger side with that intake.
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Re: Please help me figure out this noise

Post  dfree383 on December 13th 2012, 12:00 pm

Rail rockers? You have the right valve stem legnth on the for the rail type rockers?
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Re: Please help me figure out this noise

Post  bb429power on December 13th 2012, 12:09 pm

These heads were used on a different engine with the same valves, springs, and rocker arms. Here is the style they are...



I haven't ran it too long, it got quieter after running for a little, but it was still making noise.
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Re: Please help me figure out this noise

Post  dfree383 on December 13th 2012, 12:27 pm

Try about 1/2 turn of preload more.
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Re: Please help me figure out this noise

Post  bb429power on December 13th 2012, 12:39 pm

dfree383 wrote:Try about 1/2 turn of preload more.
So 3/4 total? I only did 1/4 since it looked like any more put to much pressure on the valve, but I'll try it.
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Re: Please help me figure out this noise

Post  69F100 on December 13th 2012, 3:19 pm

bb429power wrote:
dfree383 wrote:Try about 1/2 turn of preload more.
So 3/4 total? I only did 1/4 since it looked like any more put to much pressure on the valve, but I'll try it.

That sound I herd sounds the same as my 86 F150 it is on it 3rd engine with over 400,000 on the the truck itself and sounds the same way with all 3 engines.Mine has the hydro roller cam to I have 3/4 round of preload on my rockers I think the sound is more from the fuel system on these models more than the rockers. I maybe wrong but I also have my egr system and smog deleted on mine.
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Re: Please help me figure out this noise

Post  bb429power on December 15th 2012, 12:59 pm

Put a long screwdriver on the valve cover....nothing. Put it on the injector, tick tick tick tick tick. I guess that's all it is Smile Now I have to get the timing set right, and I'm kinda ticked off that this thing doesn't have a big improvement in power after everything I've done, maybe I need to do a mass air flow conversion to get the power out of it scratch Thanks for the advice guys! I can sleep knowing that everything is fine
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