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Old 01-06-2013, 07:56 PM   #1 (permalink)
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390 valve train noise

Hey got my first FE in a 72 f250. Now that I got all the exhaust leaks fixed I noticed that the right side sounds like the lifters are tapping and the left side sounds normal. Is that normal for an FE? Got plenty of oil pressure and of course oil.
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1969 Mercury Montego MX 5.0 w AOD, 1969 Mercury Comet 351w, FMX, moving under it's own power now!
1968 Monty Convertible (on blocks)
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Old 01-06-2013, 08:48 PM   #2 (permalink)
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Re: 390 valve train noise

It's normal if the valves have begun to recess in the head... Or if the pushrods are too short, or if the lifters are going bad...

Take off the VC, remove the rocker shaft and put a level across the valve stems and see how much variance there is.
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Old 01-07-2013, 06:14 AM   #3 (permalink)
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Re: 390 valve train noise

thanks I'll give that a shoot next weekend
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1969 Mercury Montego MX 5.0 w AOD, 1969 Mercury Comet 351w, FMX, moving under it's own power now!
1968 Monty Convertible (on blocks)
1999 F250 Crew Cab Power Stroke, 4 inch exhaust, DP-tuner chip
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Old 01-07-2013, 06:45 AM   #4 (permalink)
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Re: 390 valve train noise

When you have it off, rotate the engine until you get each set of valves closes and check for gaps between the rocker tip and the valves first off.
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Old 01-08-2013, 01:13 AM   #5 (permalink)
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Question Re: 390 valve train noise

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Originally Posted by FEandGoingBroke View Post

When you have it off, rotate the engine until you get each set of valves closes and check for gaps between the rocker tip and the valves first off.
How is that done with hydraulic tappets?



...starting to sound like mumbles...
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Old 01-08-2013, 06:53 AM   #6 (permalink)
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Re: 390 valve train noise

He is looking for ROOM. If there is room to place a feeler gauge between the stem and rocker tip, there is a problem with that lifter...
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Old 01-08-2013, 08:18 AM   #7 (permalink)
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Question Re: 390 valve train noise

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Originally Posted by FEandGoingBroke View Post

He is looking for ROOM. If there is room to place a feeler gauge between the stem and rocker tip, there is a problem with that lifter...


Room? You mean air gap? Wouldn't he have to collapse the tappet to determine that? If there is actual room without collapsing the lifter(s), then most likely the push-rod would have become loose and bent wouldn't you think?

What about that twirly-finger thing you do? Does that come into play in a situation such as this?
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Old 01-08-2013, 09:27 AM   #8 (permalink)
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Re: 390 valve train noise

No twirly fingers here, I don't use that method as noted in another thread...

If he has movement (yes an air gap--- I was speaking in terms anyone can understand.... simply meaning if he can insert a feeler gauge between rocker tip and valve stem) of the rocker arm when at TDC then there is the possibility of a lifter issue, or a worn cam, or a bent pushrod, etc... (twisting pushrod will show if it's bent, but not tell you anything about the lifter)
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