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By oldcarmark - 15 Years Ago
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If the valve lash is correctly adjusted should you still be able to hear the lifter noise when warmed up?I suspect mine are too tight as I cannot hear any lifter noise when warmed up and the vacuum gauge has a irregular "wander "of about 1 inch up and down at idle.Also have rough idle which worsens as motor heats up.Have about 15 vacuum at idle in neutral.
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By Ol'ford nut - 15 Years Ago
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It's a solid lifter engine, they may quiet down warmed up but you should still hear them. What method did you use to adjust them? I do mine cold, tighten them up to zero lash (push rod still rotates by fingers) and then back them up 1/4 turn.
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By oldcarmark - 15 Years Ago
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Thats the way I did them.Being a new motor parts may have "settled" a little so I will redo the adjustment.Just was not sure If there should still be an audible valve noise after adjustment and warmed up.Hopefully that should bring the vacuum reading up to where I think it should be around 18 or so with stock cam.
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By HT32BSX115 - 15 Years Ago
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lifter noise And of course..........it's NOT noise!!!
Cheers,
Rick
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By aussiebill - 15 Years Ago
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Ol'ford nut (6/18/2010)
It's a solid lifter engine, they may quiet down warmed up but you should still hear them. What method did you use to adjust them? I do mine cold, tighten them up to zero lash (push rod still rotates by fingers) and then back them up 1/4 turn. That method may work but is more suited to hydraulic lifters, unless 1/4 turn or 1/4 of the adjuster screw pitch is approx .019", then i dont suggest its is the correct way to be doing them. i have allways split the fireing order, 1548 6372 Set #1 tappets rocking on both valves then adjust gap on #6, rotate engine till #5 is rocking and set #3, otherwise 1/4 crankturn is next cyl rocking. follow it through till #2 is gapped, then rotate engine till #6 is rocking and gap #1, rotate till #3 rocking and gap #5 etc. just the way i,ve done it for years.
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By Moz - 15 Years Ago
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if i dont hear the lifters i think ive either gone deaf or somethings wrong with the cam or lifters
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By charliemccraney - 15 Years Ago
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They should make some noise but if it starts sounding like an air cooled VW, something is wrong.
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By oldcarmark - 15 Years Ago
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Hello Aussiebill. There is an article somewhere from one of the T-Bird clubs.Someone did some mathematical calculations based on the pitch of the adjuster threads. 1/4 turn of the screw is .0192 lash which is about as close to .019 as you can get.If there is wear on the rocker arm its almost impossible to get an accurate reading with a feeler gauge.1/4 turn is more accurate with old rocker arms.I set my valves turning the motor 1/4 turn starting with #1 cylinder(on compression) and follow the firing order one at a time.Thanks Charlie!I am hard of hearing so I asked my buddy if he could hear any lifter noise once warmed up.Says no so I will get into it today and reset the valves.I will ask him again once I readjust the valves.
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By charliemccraney - 15 Years Ago
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That method assumes the use of 1.54:1 rockers. The screw is 20 threads per inch. 1/20 = .05", .05*1.54 = .077", .077/4 = .01925"
With 1.43:1 rockers, it will be about .018" With 1.6:1 rockers, it will be .02"
Still pretty close in any case.
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By oldcarmark - 15 Years Ago
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Thanks Charlie.Didnt know that.Whats the ratio on the 55 292 arms?
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By charliemccraney - 15 Years Ago
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It's probably 1.43:1 if they're original.
I found that jam nut style adjusters took some practice when I first used them. At first, every time I tightened the nut, the lash would end up a hair tight. Now I have a pretty good feel for it and usually get it right the first try.
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By oldcarmark - 15 Years Ago
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Thanks Charlie.I just went through and readjusted all.They were tight.Set them with .020 feeler gauge and they dont sound excessively noisey at startup so I think I got it.Idles MUCH better now.Got 18 vacuum in neutral and 15.5 in drive with only a slight flicker on the vacuum gauge which will settle down with break in I'm sure.You may recall my post back aways where I couldnt get it to idle in drive.After getting a lot of advice from Steve (Greenbird56) think I have finally got it sorted out.PCV,carbsetup and adjustment,as well as shimming the distributor and now getting the valves properly adjusted.Running VERY close to what I expected when I rebuilt this motor.Its taken quite a while and some trial and error to sort it out but thanks to a lot of help from many people on this site I think I GOT IT!I did find #5 plug was fouled (rich) from spark breakdown.It would fire at idle but lose fire under load.Replaced the plug and then the wire which I think was the problem.Still getting buildup on that plug but could there be a lot of carbon(fuel residue) in the cylinder which will clear as its driven?Must have been breaking down all along.Its firing now because the idle is much better .Thanks
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By gritsngumbo - 15 Years Ago
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HT32BSX115 (6/18/2010)
lifter noise And of course..........it's NOT noise Cheers, Rick It's MUSIC! At least to my ears.
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By aussiebill - 15 Years Ago
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oldcarmark (6/19/2010)
Hello Aussiebill. There is an article somewhere from one of the T-Bird clubs.Someone did some mathematical calculations based on the pitch of the adjuster threads. 1/4 turn of the screw is .0192 lash which is about as close to .019 as you can get.If there is wear on the rocker arm its almost impossible to get an accurate reading with a feeler gauge.1/4 turn is more accurate with old rocker arms.I set my valves turning the motor 1/4 turn starting with #1 cylinder(on compression) and follow the firing order one at a time.Thanks Charlie!I am hard of hearing so I asked my buddy if he could hear any lifter noise once warmed up.Says no so I will get into it today and reset the valves.I will ask him again once I readjust the valves.OK, that falls into the clearance area ok. thank you. regards bill.
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By Doug T - 15 Years Ago
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When my truck had a worn engine and stock cam I could still get it to idle well and be nearly silent. Standing next to it with the hood closed you could not hear tappet noise. I don't think FoMoCo would like to sell the cars if they were noisier than the scrubs with hydraulics. Charlie I have experienced the same thing with jam nut rockers especially Dove's. I think the reason is that while you are adjusting them there is an oil film between the threads and the underside of the jam nut. When you get it set exactly as you want it and then snug up the jam nut you squeeze the oil out and the adjustment is slightly wide usually .001 or .002". It is annoying. Many Yblock people obsess over valve lash but especially with stock cams it is not that critical
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By mctim64 - 15 Years Ago
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[b]aussiebill That method may work but is more suited to hydraulic lifters, unless 1/4 turn or 1/4 of the adjuster screw pitch is approx .019", then i dont suggest its is the correct way to be doing them. i have allways split the fireing order, 1548 6372 Set #1 tappets rocking on both valves then adjust gap on #6, rotate engine till #5 is rocking and set #3, otherwise 1/4 crankturn is next cyl rocking. follow it through till #2 is gapped, then rotate engine till #6 is rocking and gap #1, rotate till #3 rocking and gap #5 etc. just the way i,ve done it for years. This is the way I like to do them, it's simple and works although you aren't on the exact heal of the lobe. The 1/4 turn method I used once when I was on a camping trip with no feeler gauges and I felt like adjusting my valves. (I was bored  ) Worked real well, and I have 1.43 rockers.
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