How do you adjust a Harley Davidson pushrod?

Pushrod Adjustment

1. Bring Cam to Base circle for the tappets you wish to adjust. Rotate the engine.
2. Adjust the pushrods. Bring pushrods to Zero lash, no up and down movement, tight against rocker arm, and tight against tappet/lifter.
3. If you cannot spin the pushrod, you have S&S Limited Travel tappets (HL2T kit).

When should pushrods be adjusted?

To Adjust the Pushrods…. That is when exhaust lifter is traveling down and the intake lifter is traveling up (closing the exhaust valve and opening the intake valve). Once you find that for the rear cylinder, the FRONT cylinder will be on its compression stroke. You can now adjust the front cylinder pushrods.

What happens if pushrods are too short?

The lash created by having too short of a pushrod can cause anything from excess valvetrain noise to component failure of the cam, lifter, or rocker arm. It can also cause damage to the pushrod, valve tip, or even the valveguide.

What affects pushrod length?

If you are assembling a new performance engine equipped with non-standard parts like 0.100-inch longer intake valves or lash caps, these components directly affect the pushrod length. Other variables that affect pushrod length would be changing from a flat tappet to mechanical or hydraulic roller lifters.

Why is my Harley ticking?

The sound goes away when the motor rebuilds oil pressure in the lifter. If there was carbon build up on your valves, the ticking usually lingers even after the m/c is @ running temp.

What causes push rod failure?

The two most common causes of this failure are; Bad fuel (I have seen bad fuel cause momentary valve stick in large and small engines causing rocker arms to fall out between cam and valve or bent push rods.) Bad fuel can leave sticky deposit on intake valve.

What’s the difference between 1.5 and 1.6 rocker arms?

1.5 rockers lift the valve 1.5 times the lobe lift of the cam, 1.6 lift the valve 1.6 times lobe lift. Generally, 1.6 rockers are used to improve the lift of a camshaft that has low lift. They can also be used to get the valve lift into a specific head flow range.

Why are pushrod engines bad?

Pushrod is inferior in every way but cost to make, and retool an engine manufacturing plant. If you want more power, more efficiency, more torque, higher RPM, more valves (for more efficiency and higher RPM) the pushrod is a weak link.

Does cam lift affect pushrod length?

Even something as simple as replacing a stock cam with a performance cam will change pushrod length. The base circle of the cam lobes on a performance cam are usually ground to a smaller diameter so the lobes can provide more total lift.

Are Harley engines noisy?

The Harley V-twin engine is characteristically noisy. Many owners find themselves fretting over engine sounds that clatter, tick, and rattle, but experience no ride-ability issues or loss of performance.

What do you need to know about pushrod adjustment?

Pushrod adjustment is a very frequent topic of phone calls to the S&S tech department. Like most things, it’s pretty simple when you understand it, but with the amount of myth, urban legend, advice from the end of the bar, and plain B.S. floating around, it’s kind of hard to sort out the facts.

How many turns does A S & S pushrod take?

The number of turns can vary according to the thread pitch of the adjuster screw. S&S pushrods have 32 threads per inch, so we recommend four turns (or 24 flats) of the adjuster nut. Once the locking nuts are tightened, you have to wait about 10 minutes for the oil to bleed out of the tappets.

What does a hydraulic lifter and pushrod do?

A couple of things there I thing you are mistaken about. The lifters and pushrods have nothing to do with timing…they merely control the open and closing of the valves in the head.

What is the minimum number of turns for an AMS HyLIFT pushrod?

If unsure look for your brand in the chart in Appendix II. Divide the tpi number by 16 – this is the minimum number of turns you will need to lengthen the pushrod. (example: 24 tpi / 16 = 1-1/2 turns which is approx 0.063”. With AMS-Hylift lifters and 32 tpi PRs, adjust them 2 to 2-1/4 turns).