Rocker stud question
Thread Starter
|
Tuned
Joined: Mar 2005
Posts: 479
Likes: 0
From: Mesa AZ
Rocker stud question
The head that was originally on my motor had the 3/8 studs. The head was cracked, so I ordered a reman from autozoo. The new head had 5/16 studs. I ordered new nuts and installed everything as if it was the 3/8. The valves were set and all seems good. Reading one of the other posts yesterday, it got the impression that the heads with the 5/16 nut are supposed to have the nut tightened all the way down. Am i misunderstanding this?
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Is this what your studs look like? These have a 3/8" shaft that necks down to a 5/16" thread.
The rocker arm and ball are 3/8" diameter and slide down on the shaft. Then, the 5/16" nut stops when it gets to the flare.
The flare is designed to be distanced perfectly so that when the nut hits it, everything in your valve train geometry is lined up just right. The valves are set, the push rods are pressed just the right amount into the lifters, etc.
The issue with this design is that if you change anything, you can't make any adjustments aside from changing the length of the push rods. But when you're Ford and you're popping out millions of these motors out of the factory, it makes things much faster.
Thread Starter
|
Tuned
Joined: Mar 2005
Posts: 479
Likes: 0
From: Mesa AZ
yes, my studs look like that. Issue is, if I tightened any further on the nuts, I bottomed out in the lifter. Push rods are "standard length" according to autozone. ( I had to replace a couple chewed up ones. ) I'll have to take the v cover and side cover off and look again when I get home.
Trending Topics
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
It's possible that the reman head you have was planed to clean it up. If you shave metal off the head, the distance between the rocker arm and the lifter decreases. This is why there are also 0.060" undersized pushrods.
If you're certain your push rods are bottoming out in the lifter, you may want to try a set of those.
If you're certain your push rods are bottoming out in the lifter, you may want to try a set of those.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Freshman User
Joined: Nov 2017
Posts: 25
Likes: 0
If you ran the engine with the valves adjusted the way you said to start with, the the lifters are pumped full of oil, when you torque the nuts down they have to have a little time to bleed back down. that should not take long. If you have compression on every cylinder then it should stabilize while running and be ok.
Thread Starter
|
Tuned
Joined: Mar 2005
Posts: 479
Likes: 0
From: Mesa AZ
Engine has not been run yet. Its still on the stand. Lifters are brand new, so other than assembly lube, they should not be pumped up. I adjusted while at tdc on the cylinders I was working on and watched the lifters compress as I worked. Ill double check it when I get home, but I am fairly certain a couple of them bottomed out. If nothing else, sitting in the semi adjusted state should have pushed any oil out.
Freshman User
Joined: Nov 2017
Posts: 25
Likes: 0
If they are on the base circle of the cam they should not be bottomed out, if they are on the ramp or the nose of the lobe they will be bottomed out. rotate the engine and you will see. The way the positive stop studs work puts the lifter travel of the plunger in about mid position. The plunger travel on a Ford lifter should be approx .140, the preload should be approx .070
Thread
Thread Starter
Forum
Replies
Last Post
Brian LM
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
4
May 5, 2013 09:02 PM
|WYG|SS
Ford Inline Six, 200, 250, 4.9L / 300
12
Jan 13, 2011 09:40 PM