Previous Thread
Next Thread
Print Thread
Page 1 of 2 1 2
how do you check valve lash? potential issue #2370445
09/14/17 12:10 AM
09/14/17 12:10 AM
Joined: Jan 2003
Posts: 4,243
Canada
Kam*Kuda Offline OP
master
Kam*Kuda  Offline OP
master

Joined: Jan 2003
Posts: 4,243
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)


1970 Barracuda Convertible
1968 Satellite Street Strip car
1654.5 Mustang
1955 Land Rover
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
Joined: Feb 2012
Posts: 4,443
Morristown Tn.
7
71birdJ68 Offline
master
71birdJ68  Offline
master
7

Joined: Feb 2012
Posts: 4,443
Morristown Tn.
Iron, or aluminum heads? Iron, or aluminum block?

Last edited by 71birdJ68; 09/14/17 12:19 AM.
Re: how do you check valve lash? potential issue [Re: 71birdJ68] #2370462
09/14/17 12:37 AM
09/14/17 12:37 AM
Joined: Jan 2003
Posts: 4,243
Canada
Kam*Kuda Offline OP
master
Kam*Kuda  Offline OP
master

Joined: Jan 2003
Posts: 4,243
Canada
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
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
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,007
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


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 36,040
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.


live every 24 hour block of time like it's your last day on earth
Re: how do you check valve lash? potential issue [Re: Kam*Kuda] #2370513
09/14/17 02:26 AM
09/14/17 02:26 AM
Joined: Jan 2003
Posts: 2,150
Fancy Farm Ky
W
wyoming Offline
top fuel
wyoming  Offline
top fuel
W

Joined: Jan 2003
Posts: 2,150
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.

Re: how do you check valve lash? potential issue [Re: wyoming] #2370548
09/14/17 07:18 AM
09/14/17 07:18 AM
Joined: Mar 2006
Posts: 9,791
MI, usa
dvw Online content
master
dvw  Online Content
master

Joined: Mar 2006
Posts: 9,791
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

Re: how do you check valve lash? potential issue [Re: dvw] #2370590
09/14/17 11:02 AM
09/14/17 11:02 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
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

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
Joined: May 2011
Posts: 4,488
northern,Ohio,USA
C
Clanton Offline
master
Clanton  Offline
master
C

Joined: May 2011
Posts: 4,488
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?


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: how do you check valve lash? potential issue [Re: Clanton] #2370613
09/14/17 11:40 AM
09/14/17 11:40 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
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

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
Joined: Jan 2003
Posts: 4,243
Canada
Kam*Kuda Offline OP
master
Kam*Kuda  Offline OP
master

Joined: Jan 2003
Posts: 4,243
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
1654.5 Mustang
1955 Land Rover
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
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
F
fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
F

Joined: Jan 2003
Posts: 14,479
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.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: how do you check valve lash? potential issue [Re: Kam*Kuda] #2370699
09/14/17 01:35 PM
09/14/17 01:35 PM
Joined: Jul 2004
Posts: 19,317
State of confusion
T
Thumperdart Offline
I Live Here
Thumperdart  Offline
I Live Here
T

Joined: Jul 2004
Posts: 19,317
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


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: how do you check valve lash? potential issue [Re: Kam*Kuda] #2370729
09/14/17 02:04 PM
09/14/17 02:04 PM
Joined: Nov 2005
Posts: 690
New Hampshire, USA
O
oldiron Offline
mopar
oldiron  Offline
mopar
O

Joined: Nov 2005
Posts: 690
New Hampshire, USA


66 Belvedere Vert, 4 Speed/Jerico, slowly, very slowly, getting faster - NA LD Wedge
New New Best: 10.56 @129
68 B'cuda 4 gear Jerico - Another New Best of 9.86 & Trying to slow up
https://www.youtube.com/watch?v=T4jDLKwd9Gs
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
Joined: Jan 2003
Posts: 4,243
Canada
Kam*Kuda Offline OP
master
Kam*Kuda  Offline OP
master

Joined: Jan 2003
Posts: 4,243
Canada
It looks like the problem is the adjuster


IMG_4907.JPGIMG_4911.JPGIMG_4912.JPG
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
Re: how do you check valve lash? potential issue [Re: Kam*Kuda] #2371386
09/15/17 08:04 PM
09/15/17 08:04 PM
Joined: Jan 2003
Posts: 4,243
Canada
Kam*Kuda Offline OP
master
Kam*Kuda  Offline OP
master

Joined: Jan 2003
Posts: 4,243
Canada
push rod worn a bit too

IMG_4913.JPGIMG_4910.JPG

1970 Barracuda Convertible
1968 Satellite Street Strip car
1654.5 Mustang
1955 Land Rover
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
Joined: Jan 2003
Posts: 4,243
Canada
Kam*Kuda Offline OP
master
Kam*Kuda  Offline OP
master

Joined: Jan 2003
Posts: 4,243
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
1654.5 Mustang
1955 Land Rover
Re: how do you check valve lash? potential issue [Re: Kam*Kuda] #2371404
09/15/17 08:46 PM
09/15/17 08:46 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,007
Bend,OR USA
Are all the pushrods the exact same lengths? If so what is causing the difference in the threads exposed? work


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: how do you check valve lash? potential issue [Re: Kam*Kuda] #2371408
09/15/17 08:51 PM
09/15/17 08:51 PM
Joined: Sep 2003
Posts: 2,175
Duloc
T
The Shadow Offline
top fuel
The Shadow  Offline
top fuel
T

Joined: Sep 2003
Posts: 2,175
Duloc
is the adjuster screw soft?

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
Joined: Jan 2003
Posts: 4,243
Canada
Kam*Kuda Offline OP
master
Kam*Kuda  Offline OP
master

Joined: Jan 2003
Posts: 4,243
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
1654.5 Mustang
1955 Land Rover
Page 1 of 2 1 2






Powered by UBB.threads™ PHP Forum Software 7.7.1