Ford 302 engine valves wont start? - Mustang Evolution

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Old 03-04-2010, 06:15 AM   #1
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Ford 302 engine valves wont start?

Okay, I got a 66 mustang with a built 302, I know this isn't the engine that was originally in it, but this car was made for the drag. My question is, I had to replaced my valve cover gaskets, since they were leaking, and Iv'e been hearing my valves ticking lately. So I figured I'd go ahead and attempt to adjust them. This engine has aftermarket parts all in it, It got some sort of aftermarket cam, it's got a lope sound to it. I dunno what kind. I believe it to be a solid lift cam though, since the valves are adjustable. It's got a hex type screw in the rocker arm, and a nut on the outerside. My question is, I was just screwing around a little with the rocker arms, I attempted to adjust the no 3 intake and exhaust valve my tightening it. Man, did I make a mistake, I tryed to start it, and it would turn over, but it would never start. So I keep messing with the valves on that cylinder, and still no luck, and once I had the carb on fire from messing with the valves. So Im trying to figure out how to get the car back to running now? It wont run or nothing, and it acted like it wanted to kick back a little, while I was starting. How can I adjust these valves for the car to run? I dont have any specs whatsoever on the cam. Maybe yall could give me like what number on the feeler gauge to adjust them to or what? Please help.
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Old 03-04-2010, 07:04 AM   #2
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Ford 302 engine valves wont start?

First read your plugs. Are all 8 plugs showing a nice clean light brown?

Or maybe your lopey cam and screwed up valve lash show some reading a different color, and this should help tell you what is screwed up.

Now when you adjust the lash on a valve, that cylinder needs to be at TDC of the compression stroke (i.e. both valves fully closed).

It sounds to me like you have adjusted an intake valve so that it is always open, and then this makes the engine backfire. i.e. you have over-adjusted this, there is no free play, no remaining lash. Make sure you are at TDC and back it out until you can measure some lash.

Especially if you have a big open-base tunnel ram style manifold one cylinder backfiring continuous will prevent the others from getting anything.

Whenever you do any sort of "screwing around a little" you should keep record of what you do so if you put 3 turns to the left and it didn't work, you can put 3 turns to the right to undo it and maybe you are back where you started. If you didn't maintain this record we can't help you.

You may have damaged/burnt some valves as a result of what you have done so far.

========

1. Place crank at TDC, compression stroke
Firing order for 5.0 is 13726548 (verify - that's from memory)
Both valves for #1 cylinder should be fully closed at this time - check
2. If you have a drill and oil pump priming rod, pump up the lifters now (run drill motor in reverse) if not, you should disconnect the coil and spin the motor PRIOR to setting the crank at TDC
3. Place rocker on stud and run the nut down until you feel some resistance. Now, back off the nut a bit, use fingers of one hand to grasp pushrod and turn it. It should turn freely. Tighten nut by hand while spinning pushrod back and forth between two fingers. At about the same time you feel resistance in tightening the nut, you should also feel resistance to turning the pushrod. This is zero lash.
4. Use wrench to turn nut down an additional 1/2 - 3/4 turn (I use 2/3 turn, but there is no magic in that). If you have locks, hold the nut steady with wrench and tighten allen nut down to lock the nut at this position.
5. Now, turn crank 90 degrees clockwise and go to rockers for cylinder 3. Repeat 1-4.
6. Turn crank 90 degrees and go to cylinder 7. Repeat 1-4.
7. Etc. following firing order. Always verify that both valves are closed prior to adjusting each rocker.
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Old 03-04-2010, 07:55 AM   #3
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Ford 302 engine valves wont start?

I doubt you have a solid lifter cam. It sounds like you got the valves set too tight so they wont close allowing compression to pass by the open valves. Loosen up the valves you tightened, look for bent push-rods on those valves and have some one who knows what to do work with you in person on this.
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Old 03-04-2010, 08:46 AM   #4
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Ford 302 engine valves wont start?

sounds like it jumped timing
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