Valve Train

snipe · 09-26-2001, 06:04 AM

What is the procedure for adjusting hydraulic valve trains? The motor is a 351w with 750 miles on it Edelbrock Performer RPM heads, Comp Extreme Energy cam and Magnum lifters and pushrods.

Gearhead999 · 09-27-2001, 08:10 PM

I usually turn the engine over by hand till the valve is fully closed. I watch each valve I'm getting ready to adjust and also it's brother valve. When It is fully closed, I tighten the adj. nut till the push rod won't turn anymore then tighten them approx. 1/2 turn. That usually does it.

PKRWUD · 09-28-2001, 06:14 AM

That's a good starting point. Follow that up with a running adjustment. If you have a junk valve cover handy, cut off the top, and install it on one head. Start the engine. Back off one rocker at a time until it starts to clatter. Then, tighten it 1/4 turn, wait 10 seconds for the engine to stabilize, tighten it another 1/4 turn, wait 10 seconds, and one last 1/4 turn. Move to the next valve and do it again. After finishing one side, move the valve cover to the other side. FWIW, most auto parts stores sell oil deflectors that mount onto the rocker arms and keep the oil from making a mess.

Just remember, no matter how you do it, once you find zero lash (start clattering if running, or when the pushrod no longer turns by hand), tighten a total of 3/4 of a turn after zero lash.

Take care
~Chris

------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

09-26-2001, 06:04 AM	#1
snipe Registered Member Join Date: Oct 2000 Location: Milwaukee, WI 53219 USA Posts: 10	Valve Train What is the procedure for adjusting hydraulic valve trains? The motor is a 351w with 750 miles on it Edelbrock Performer RPM heads, Comp Extreme Energy cam and Magnum lifters and pushrods.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
valve train questions..what to get first	66StangGuy	Classic Mustangs	6	05-22-2003 01:43 AM
pushrod length question/adjusting valve train preload	84LX89GT	Windsor Power	4	01-03-2003 03:59 PM
Valve train 'a knocken,oil pressure blues	robertwigton	Windsor Power	4	12-04-2001 06:27 PM
DOHC Valve Train Noise	timbo3282	Modular Madness	0	08-29-2001 03:41 PM
valve train question???	vande97	Windsor Power	0	05-04-2001 05:00 PM

09-27-2001, 08:10 PM	#2
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	I usually turn the engine over by hand till the valve is fully closed. I watch each valve I'm getting ready to adjust and also it's brother valve. When It is fully closed, I tighten the adj. nut till the push rod won't turn anymore then tighten them approx. 1/2 turn. That usually does it.

09-28-2001, 06:14 AM	#3
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	That's a good starting point. Follow that up with a running adjustment. If you have a junk valve cover handy, cut off the top, and install it on one head. Start the engine. Back off one rocker at a time until it starts to clatter. Then, tighten it 1/4 turn, wait 10 seconds for the engine to stabilize, tighten it another 1/4 turn, wait 10 seconds, and one last 1/4 turn. Move to the next valve and do it again. After finishing one side, move the valve cover to the other side. FWIW, most auto parts stores sell oil deflectors that mount onto the rocker arms and keep the oil from making a mess. Just remember, no matter how you do it, once you find zero lash (start clattering if running, or when the pushrod no longer turns by hand), tighten a total of 3/4 of a turn after zero lash. Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!