Do you need to adjust rocker arms on a Pontiac?
Whether you have decided to stay with the stock type stamped rocker arms or Competition Cams Magnum Rollers Rockers as pictured here, or something far more exotic, you will need to adjust valve lash. Torquing the adjusting nut per the old Chilton’s to 20-25 ft pounds won’t work on any heads that have been milled.
When do you know you need to adjust a valve?
You can only properly adjust the valvetrain after removing and closely scrutinizing each of the rocker arms, pushrods and valve stems (the cylinder heads do not need to come off at this point). If the lash on one valve seems excessively loose or tight, that is a red flag that there is something wrong.
How do you adjust the valve on a hydraulic lifter?
When adjusting the valves on an engine with hydraulic lifters, you are not really setting the lash or clearance–you’re actually setting the preload on the lifter through the pushrod and rocker arm. The traditional adjustment on a hydraulic lifter is zero lash, followed by a predetermined amount of turns on the hold-down nut.
Do you need a feeler gauge to adjust a valve?
An engine equipped with a hydraulic cam does not require a feeler gauge. When adjusting the valves on an engine with hydraulic lifters, you are not really setting the lash or clearance–you’re actually setting the preload on the lifter through the pushrod and rocker arm.
How to adjust valves / torque rocker arms on 01 Ford 3.0L OHV?
How do I adjust valves/torque rocker arms on 01 Ford 3.0L OHV? You don’t adjust valves any more because they use hydraulic lifters that fill with oil and expand to the size needed. If you have a noisy lifter, your oil is too thin or the lifter has collapsed and needs replacing.
How to install and torquing LS rocker arm?
LS Rocker Arm Install and Torquing. (3 Easy Steps… YOU CAN DO IT!) – YouTube LS Rocker Arm Install and Torquing. (3 Easy Steps… YOU CAN DO IT!) If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations.
Whether you have decided to stay with the stock type stamped rocker arms or Competition Cams Magnum Rollers Rockers as pictured here, or something far more exotic, you will need to adjust valve lash. Torquing the adjusting nut per the old Chilton’s to 20-25 ft pounds won’t work on any heads that have been milled.
You can only properly adjust the valvetrain after removing and closely scrutinizing each of the rocker arms, pushrods and valve stems (the cylinder heads do not need to come off at this point). If the lash on one valve seems excessively loose or tight, that is a red flag that there is something wrong.
Where is the rocker when opening a valve?
This height, where the rocker is pushing straight down on the valve at half lift, is also the point where the rocker tip is furthest outon the valve from the shaft at half lift. The right angle point is the most outward point of the rocker’s circular arc when opening the valve.
How does the rocker height set the fulcrum?
With stud mounts, pushrod length sets fulcrum height. In both system valve tip height compared to rocker pad height height plays an important role. It is possible to move the rocker tipinwardtoward the shaft or fulcrum either by raising or by lowering the rocker shaft height from the minimum sweep height.
How are rocker arms like spokes of a wheel?
Rocker arm ends move in circular arcs. Thinking of rockers like spokes of a wheel can be helpful, the axle being the rocker shaft or fulcrum point. Because of the sweeping motion caused by the “wheel” radius, narrowest possible sweep occurs when the rocker pushes down at right angles (90-degrees) to the valve near half lift.
What do I need to torque rocker arms?
· If you are installing adjustable rocker arms you will also need a 1/8” male hex driver and a thin wall 9/16” socket and ratchet. · For adjustable rockers: Thread the pushrod seat all the way into the rocker. A 1/8” hex driver and a cordless drill in reverse will help speed up this process.
How do you install Rockers on a car?
Install the rockers one cylinder at a time in any order. The rocker pedestals are made up of three pieces to install two rockers (one pedestal plate and two rocker stands). Align one of the pedestal plates on the head with the groove side facing up.
How to torque the rocker arms on a 3800pro?
Slowly thread the rocker bolts into the cylinder head. Be sure that the pushrods are correctly positioned into the pushrod seats (see figure 3). Torque rocker bolts to 25 foot pounds using fluid motion to avoid false torque readings. Continue to install each set of two rocker arms until you are complete.
How do you install a rocker on a pedestal?
The rocker pedestals are made up of three pieces to install two rockers (one pedestal plate and two rocker stands). Align one of the pedestal plates on the head with the groove side facing up. Next, place a rocker bolt through both of the rockers (IMPORTANT: make sure the rocker fulcrum recess faces up, see figure 1).
Where is the TDC on a Pontiac rocker arm?
Locate TDC on #1 by locating the ‘0’ on the timing tab with the harmonic balancer line. You can determine whether it’s really the #1 cylinder a couple of ways. One way is too look at the hydraulic lifters. If the hydraulic lifters are down and level you’re on # 1 TDC.
What are the torque specs on a Pontiac?
Torque Timing Cover to Intake Bolt first, THEN torque remaining Intake Manifold Bolts
Can a Pontiac Montana rocker panel be replaced?
If you have sustained crash damage, many body shops will try to put a band aid over your damaged Pontiac Montana rocker panel by using thick body fillers which can trap moisture and will eventually crack and chip ruining your new paint job. Replacement rocker panels are the correct way to go about your body repair.
Is the rocker arm on a Pontiac too tight?
After two decades of hands-on with various Pontiac V8 engines, we find that insufficient attention is given to rocker arm adjustment. Proper engine operation and optimal performance will not be reached if your rocker arm adjustment is to tight or too loose, apart from other aspects.
Locate TDC on #1 by locating the ‘0’ on the timing tab with the harmonic balancer line. You can determine whether it’s really the #1 cylinder a couple of ways. One way is too look at the hydraulic lifters. If the hydraulic lifters are down and level you’re on # 1 TDC.
Torque Timing Cover to Intake Bolt first, THEN torque remaining Intake Manifold Bolts
What is the firing order on a Pontiac?
The firing order on all Pontiac motors is 1-8-4-3-6-5-7-2. The best place to start the adjustment process is to begin with the #1 cylinder. Whether you are building a new motor, swapping in a cam, or adding other upper valve train components, start with the #1 cylinder.
What kind of valve lift does a Pontiac 068 have?
The high-performance Pontiac cams hobbyists are most familiar with are the 068 and 041 grinds developed during the 1960s. The 068 was developed for high performance street use and contains 212/225 degrees of .050-inch duration and just over .400-inch valve lift.