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#2370445 - 09/13/17 10:10 PM how do you check valve lash? potential issue
Kam*Kuda Offline
master

Registered: 01/20/03
Posts: 4106
Loc: Canada
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! frown
All the others were close smile

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)
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1970 Barracuda Convertible
1968 Satellite Street Strip car
2015 Challenger

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#2370448 - 09/13/17 10:19 PM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
71birdJ68 Offline
master

Registered: 02/09/12
Posts: 3274
Loc: Morristown Tn.
Iron, or aluminum heads? Iron, or aluminum block?


Edited by 71birdJ68 (09/13/17 10:19 PM)

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#2370462 - 09/13/17 10:37 PM Re: how do you check valve lash? potential issue [Re: 71birdJ68]
Kam*Kuda Offline
master

Registered: 01/20/03
Posts: 4106
Loc: Canada
Iron block
Aluminum heads Indy EZ
Harland Sharps
Comp Roller Cam
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1970 Barracuda Convertible
1968 Satellite Street Strip car
2015 Challenger

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#2370495 - 09/13/17 11:39 PM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
Cab_Burge Online   content
Too Many Posts

Registered: 08/23/03
Posts: 29209
Loc: Bend,OR USA
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 scope
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 up
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 thumbs
Don't be surprised on the changes hot to cold, not all motors respond exactly the same scope
One of my street motors with Edlbrock heads only change .001, another street motor with the same part number RPM heads changed .008 shock shruggy
Have fun, write down the changes for future use scope
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#2370502 - 09/13/17 11:44 PM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 32405
Loc: Lincoln Nebraska
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.
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#2370513 - 09/14/17 12:26 AM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
wyoming Offline
top fuel

Registered: 01/19/03
Posts: 2011
Loc: Fancy Farm Ky
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.
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#2370548 - 09/14/17 05:18 AM Re: how do you check valve lash? potential issue [Re: wyoming]
dvw Offline
master

Registered: 03/16/06
Posts: 6438
Loc: MI, usa
Originally Posted By wyoming
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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#2370590 - 09/14/17 09:02 AM Re: how do you check valve lash? potential issue [Re: dvw]
MR_P_BODY Offline
Master

Registered: 06/13/03
Posts: 50130
Loc: Romeo MI
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
wave
_________________________

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Mike "Raff"...(180)Watching over us
CAR IS FOR SALE

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#2370605 - 09/14/17 09:30 AM Re: how do you check valve lash? potential issue [Re: Cab_Burge]
Clanton Offline
master

Registered: 05/15/11
Posts: 3155
Loc: northern,Ohio,USA
Originally Posted By Cab_Burge
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 scope
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 up
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 thumbs
Don't be surprised on the changes hot to cold, not all motors respond exactly the same scope
One of my street motors with Edlbrock heads only change .001, another street motor with the same part number RPM heads changed .008 shock shruggy
Have fun, write down the changes for future use scope
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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#2370613 - 09/14/17 09:40 AM Re: how do you check valve lash? potential issue [Re: Clanton]
MR_P_BODY Offline
Master

Registered: 06/13/03
Posts: 50130
Loc: Romeo MI
Originally Posted By Clanton
Originally Posted By Cab_Burge
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 scope
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 up
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 thumbs
Don't be surprised on the changes hot to cold, not all motors respond exactly the same scope
One of my street motors with Edlbrock heads only change .001, another street motor with the same part number RPM heads changed .008 shock shruggy
Have fun, write down the changes for future use scope
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
wave
_________________________

W-9 8.94 @ 151 NOW ON E-85
Mike "Raff"...(180)Watching over us
CAR IS FOR SALE

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#2370627 - 09/14/17 10:08 AM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
Kam*Kuda Offline
master

Registered: 01/20/03
Posts: 4106
Loc: Canada
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
2015 Challenger

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#2370693 - 09/14/17 11:32 AM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
fast68plymouth Offline
I Live Here

Registered: 01/20/03
Posts: 10101
Loc: So. Burlington, Vt.
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.
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#2370699 - 09/14/17 11:35 AM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
Thumperdart Offline


Registered: 07/12/04
Posts: 17971
Loc: State of confusion
The only way I set em now is when the ex. just starts to open I set the in. when the in. is fully open I set the ex. and have checked it w/the manifold off and I'm on the base circle. Any other lazy method as stated was off by a good amount any my solid roller w/alum. heads and iron block ends up at .020 hot when I set em at .014 cold and no way I'd play the hot setting method except once to verify the settings then cold from now on............Too much unnecessary dirty work........... thumbs
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#2370729 - 09/14/17 12:04 PM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
oldiron Offline
mopar

Registered: 11/08/05
Posts: 623
Loc: New Hampshire, USA
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#2371384 - 09/15/17 06:01 PM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
Kam*Kuda Offline
master

Registered: 01/20/03
Posts: 4106
Loc: Canada
It looks like the problem is the adjuster



Attachments
IMG_4907.JPG

IMG_4911.JPG

IMG_4912.JPG




Edited by Kam*Kuda (09/15/17 06:02 PM)
_________________________
1970 Barracuda Convertible
1968 Satellite Street Strip car
2015 Challenger

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#2371386 - 09/15/17 06:04 PM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
Kam*Kuda Offline
master

Registered: 01/20/03
Posts: 4106
Loc: Canada
push rod worn a bit too


Attachments
IMG_4913.JPG

IMG_4910.JPG


_________________________
1970 Barracuda Convertible
1968 Satellite Street Strip car
2015 Challenger

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#2371387 - 09/15/17 06:06 PM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
Kam*Kuda Offline
master

Registered: 01/20/03
Posts: 4106
Loc: Canada
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
2015 Challenger

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#2371404 - 09/15/17 06:46 PM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
Cab_Burge Online   content
Too Many Posts

Registered: 08/23/03
Posts: 29209
Loc: Bend,OR USA
Are all the pushrods the exact same lengths? If so what is causing the difference in the threads exposed? work
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Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2371408 - 09/15/17 06:51 PM Re: how do you check valve lash? potential issue [Re: Kam*Kuda]
The Shadow Offline


Registered: 09/25/03
Posts: 2077
Loc: Duloc
is the adjuster screw soft?

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#2371410 - 09/15/17 06:54 PM Re: how do you check valve lash? potential issue [Re: Cab_Burge]
Kam*Kuda Offline
master

Registered: 01/20/03
Posts: 4106
Loc: Canada
Originally Posted By Cab_Burge
Are all the pushrods the exact same lengths? If so what is causing the difference in the threads exposed? work


The compressed adjuster is the difference in the amount
_________________________
1970 Barracuda Convertible
1968 Satellite Street Strip car
2015 Challenger

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