how do you check valve lash? potential issue
#2370445
09/14/17 12:10 AM
09/14/17 12:10 AM
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Joined: Jan 2003
Posts: 4,244 Canada
Kam*Kuda
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OP
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I recently checked the valve lash using the 180 degree method checking multiple rockers the #1 exhaust valve needed a 2.5 turns to get the lash in spec! All the others were close It took me too long and the engine temperature dropped but I lashed them all at 020 I went out again after the engine was hot, I rechecked using the intake opening exhaust closing method and it needed some changes back to 020 Specially the #1 exhaust went from 020 to 024 when it cooled it was at 17 Its a (Solid Roller cam) I have relashed all the valve cold at 017 I plan to go out and drive it for a while and then let it cool and check the lash on all valve Any thoughts or suggestions. (i don't have a lot of experience)
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: how do you check valve lash? potential issue
[Re: Kam*Kuda]
#2370448
09/14/17 12:19 AM
09/14/17 12:19 AM
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Joined: Feb 2012
Posts: 4,454 Morristown Tn.
71birdJ68
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Morristown Tn.
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Iron, or aluminum heads? Iron, or aluminum block?
Last edited by 71birdJ68; 09/14/17 12:19 AM.
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Re: how do you check valve lash? potential issue
[Re: 71birdJ68]
#2370462
09/14/17 12:37 AM
09/14/17 12:37 AM
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Joined: Jan 2003
Posts: 4,244 Canada
Kam*Kuda
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Iron block Aluminum heads Indy EZ Harland Sharps Comp Roller Cam
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: how do you check valve lash? potential issue
[Re: Kam*Kuda]
#2370495
09/14/17 01:39 AM
09/14/17 01:39 AM
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Joined: Aug 2003
Posts: 43,230 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,230
Bend,OR USA
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I use the race method to set up the lash or preload on all my motors, it is using a remote starter button very easy to do and remember after doing it a couple of times You can do it cold or hot, it works either way the same. I start by reducing the lash by .006 cold on a iron block with aluminum heads by removing the valve cover and using the remote starter button I bump the motor over until the front exhaust valves just start to open, I then set the lash on the intake valve, then bump the motor over a little bit at a time until the intake valve opens all the way and starts to close a little bit. I set the exhaust lash then and go to the next cylinder in line and repeat both steps until the last cylinder is done on that side Once both sides are done I will go drive the car for 15 to 20 minutes to get it up to operating temperature and get the oil hot, I'll reset them again with the motor warmed up to find out how much the lash has increased or decreased with the warm motor. Same deal, one side at a time front to rear and rerun it before doing the other side to get it back to operating temps. before doing the other side Don't be surprised on the changes hot to cold, not all motors respond exactly the same One of my street motors with Edlbrock heads only change .001, another street motor with the same part number RPM heads changed .008 Have fun, write down the changes for future use
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: how do you check valve lash? potential issue
[Re: Kam*Kuda]
#2370502
09/14/17 01:44 AM
09/14/17 01:44 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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for a .020" spec I would get a slight drag with a .021" feeler gauge & no drag with a .019" feeler gauge. this will get you within .001". No info on the rest of your Q's but agreed, that is alot of of clearance changes. You may have to fire the eng again then do another half of the valves on the hot clearance setting.
live every 24 hour block of time like it's your last day on earth
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Re: how do you check valve lash? potential issue
[Re: wyoming]
#2370548
09/14/17 07:18 AM
09/14/17 07:18 AM
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Joined: Mar 2006
Posts: 9,858 MI, usa
dvw
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My biggest concern would be the #1 exhaust valve that took 2.5 turns to get in spec, was it tight or loose? Tight could mean the valve is sucking up, loose could be a lifter, cam, or even rocker issue. I use the same method that Cab described. Glenn is 100% correct. If it were mine I'd be taking a look with the intake off. Twice I've found issues when lash opened up .007" (with-in 25 passes). Saved me a ton of grief. Also use Cab's method of setting lash, quick, and precise. My cam is spec calls or .020" hot. It gets set at .014"/.015" cold with iron block, -1 heads. Doug
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Re: how do you check valve lash? potential issue
[Re: dvw]
#2370590
09/14/17 11:02 AM
09/14/17 11:02 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I do it the same as Cab said... then from there on I set them cold to my spec.. been doing it that way for about 20 years now
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Re: how do you check valve lash? potential issue
[Re: Cab_Burge]
#2370605
09/14/17 11:30 AM
09/14/17 11:30 AM
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Joined: May 2011
Posts: 4,489 northern,Ohio,USA
Clanton
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northern,Ohio,USA
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I use the race method to set up the lash or preload on all my motors, it is using a remote starter button very easy to do and remember after doing it a couple of times You can do it cold or hot, it works either way the same. I start by reducing the lash by .006 cold on a iron block with aluminum heads by removing the valve cover and using the remote starter button I bump the motor over until the front exhaust valves just start to open, I then set the lash on the intake valve, then bump the motor over a little bit at a time until the intake valve opens all the way and starts to close a little bit. I set the exhaust lash then and go to the next cylinder in line and repeat both steps until the last cylinder is done on that side Once both sides are done I will go drive the car for 15 to 20 minutes to get it up to operating temperature and get the oil hot, I'll reset them again with the motor warmed up to find out how much the lash has increased or decreased with the warm motor. Same deal, one side at a time front to rear and rerun it before doing the other side to get it back to operating temps. before doing the other side Don't be surprised on the changes hot to cold, not all motors respond exactly the same One of my street motors with Edlbrock heads only change .001, another street motor with the same part number RPM heads changed .008 Have fun, write down the changes for future use That way is a lot of cranking as apposed to the std lash chart with 2 revolutions.Do you ever tap the rocker tip to settle the valve in the seat to see if it changes?
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Re: how do you check valve lash? potential issue
[Re: Clanton]
#2370613
09/14/17 11:40 AM
09/14/17 11:40 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I use the race method to set up the lash or preload on all my motors, it is using a remote starter button very easy to do and remember after doing it a couple of times You can do it cold or hot, it works either way the same. I start by reducing the lash by .006 cold on a iron block with aluminum heads by removing the valve cover and using the remote starter button I bump the motor over until the front exhaust valves just start to open, I then set the lash on the intake valve, then bump the motor over a little bit at a time until the intake valve opens all the way and starts to close a little bit. I set the exhaust lash then and go to the next cylinder in line and repeat both steps until the last cylinder is done on that side Once both sides are done I will go drive the car for 15 to 20 minutes to get it up to operating temperature and get the oil hot, I'll reset them again with the motor warmed up to find out how much the lash has increased or decreased with the warm motor. Same deal, one side at a time front to rear and rerun it before doing the other side to get it back to operating temps. before doing the other side Don't be surprised on the changes hot to cold, not all motors respond exactly the same One of my street motors with Edlbrock heads only change .001, another street motor with the same part number RPM heads changed .008 Have fun, write down the changes for future use That way is a lot of cranking as apposed to the std lash chart with 2 revolutions.Do you ever tap the rocker tip to settle the valve in the seat to see if it changes? I did it that way years ago and found that with big roller cams it would be off by about .006.. it you have a battery charger on it the extra cranking didnt matter so now I do it the one way and its simple
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Re: how do you check valve lash? potential issue
[Re: Kam*Kuda]
#2370627
09/14/17 12:08 PM
09/14/17 12:08 PM
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Joined: Jan 2003
Posts: 4,244 Canada
Kam*Kuda
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yes I did the 180 and the "eoic" race method and both were close to the same for #1 exhaust which is the concern
I have the indy valve pan (which looks like it needs a head to be removed to remove the pan) but it has an inspection plate
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: how do you check valve lash? potential issue
[Re: Kam*Kuda]
#2370693
09/14/17 01:32 PM
09/14/17 01:32 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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Posts: 14,506
So. Burlington, Vt.
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I wouldn't trust that you can be certain you're truly on the base circle of both lobes at the same time. Do one valve at a time.
Exhaust starts to open...... adjust intake.
Intake opens and goes thru most of its cycle, then is almost closed..... Adjust exhaust.
The only way I can see 2.5 turns out of adjustment not pointing to a real problem is if it was adjusted that far off in the first place.
One tell tale sign would be if that adjuster screw is now 2.5 turns different than the others. If it is, you have a problem. If it isn't, it was probably set incorrectly previously.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: how do you check valve lash? potential issue
[Re: Kam*Kuda]
#2371384
09/15/17 08:01 PM
09/15/17 08:01 PM
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Joined: Jan 2003
Posts: 4,244 Canada
Kam*Kuda
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It looks like the problem is the adjuster
Last edited by Kam*Kuda; 09/15/17 08:02 PM.
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: how do you check valve lash? potential issue
[Re: Kam*Kuda]
#2371387
09/15/17 08:06 PM
09/15/17 08:06 PM
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Joined: Jan 2003
Posts: 4,244 Canada
Kam*Kuda
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first pic shows how far in the adjust is and the exhaust slide has abour 1 thread showing All other rockers are in about 1-2 threads
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: how do you check valve lash? potential issue
[Re: Cab_Burge]
#2371410
09/15/17 08:54 PM
09/15/17 08:54 PM
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Joined: Jan 2003
Posts: 4,244 Canada
Kam*Kuda
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Are all the pushrods the exact same lengths? If so what is causing the difference in the threads exposed? The compressed adjuster is the difference in the amount
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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