Setting up rockers / valve lash (yeah another one lol)

96SVTpilot

Member

Mar 10, 2006

82

0

6

Spanaway, WA

May 23, 2006

#1

• May 23, 2006

• #1

First, thanks for looking in. I have recently completed a head, intake, rockers, and clutch swap on my 92 GT. The mustang gods have decided to kick me in the nuts and not allow the car to start up on the first go . The starter turns the motor over but I get no combustion except for a weak backfire-like pop or two. I've done all the searches and checklists and I think I've narrowed it down to the valve adjustment. I am using FMS 1.6 roller rockers (pedestal) with box stock brodix ST50 heads (1.94/1.60) and stock length pushrods as recommended by brodix. My main question: after I find zero lash and torque the extra 1/4 - 1/2 turn, should I be concerned if I can still rotate the rocker by hand? This was the case my first go-around and I (mistakenly?) snugged them down a little more. I would appreciate any confirmation from you valvetrain veterans before I go ripping the intake and valve covers off again.

 

5spd GT

"the 5.0 owns all"

Founding Member

Aug 7, 2002

9,516

6

99

Arkansas

May 23, 2006

#2

• May 23, 2006

• #2

I'm sure you meant rotating the pushrod and not the rocker.

I personally (after finding zero lash - no gap between rocker tip and lifter by pulling up on the pushrod) and turning the extra 1/2", have never found that my pushrod spins.

NOw since you have pedestal mounted rockers, I believe you torque them to 22ft. lbs or so...you do not use the "1/4" or 1/2" method. Find zero lash and torque..

Good Luck!

 

legalize420

Active Member

May 21, 2005

1,541

1

37

South Florida

May 24, 2006

#3

• May 24, 2006

• #3

the rocker should not rotate. do one cylinder at a time. make sure both valves are closed. tighten to 25 ft lbs. go to next cylinder and repeat.

 

cobradvm

New Member

Sep 2, 2003

245

1

0

Woodinville, WA

May 24, 2006

#4

• May 24, 2006

• #4

Is your timing set close enough to get it to fire? I would make sure you are at TDC on #1 and have the dizzy dropped in right - make sure you are not 180 off.

 

fordman54935

Member

Jan 10, 2003

301

0

16

Wisconsin

May 24, 2006

#5

• May 24, 2006

• #5

Try this link: http://www.fordracingparts.com/download/instructionsheets.asp


Down by the bottom of the list you'll see instructions in .pdf format for your rockers - direct from Ford Racing

 

96SVTpilot

Member

Mar 10, 2006

82

0

6

Spanaway, WA

May 24, 2006

#6

• May 24, 2006

• #6

Thanks for the replies, I feel confident now diving back in

 

Killer50stang

New Member

May 11, 2004

632

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0

May 24, 2006

#7

• May 24, 2006

• #7

cobradvm said:

Is your timing set close enough to get it to fire? I would make sure you are at TDC on #1 and have the dizzy dropped in right - make sure you are not 180 off.

Click to expand...

Agreed! Sounds like a timing issue if you're getting backfire. You need to be in the range 8-12 I believe unless you're running locked timing.

 

91lxttrim

New Member

Mar 7, 2006

194

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0

AZ

May 24, 2006

#8

• May 24, 2006

• #8

cobradvm said:

Is your timing set close enough to get it to fire? I would make sure you are at TDC on #1 and have the dizzy dropped in right - make sure you are not 180 off.

Click to expand...

That was my brilliant move after my HCI. Same thing, weak crank, backfire through intake. Rotated dizzy and VROOOOM!!! Good luck!