2007-02-17 10:08:28 · 10 answers · asked by Bobbie L 1 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
You don't torque the push rods, you torque the rocker arms. The spec can be found in a repair manual, as well as the procedure. You need this manual before you turn a wrench on this motor!
2007-02-17 10:21:27 · answer #1 · answered by InjunRAIV 6 · 1⤊ 1⤋
On a Chevy 305 engine you do not torque the rocker arms which move the push rod up and down. This engine uses hydraulic lifters and the lifters take up the slack in the valve train. The easiest way to set Zero lash meaning when the push rod has no play in the contact with the rocker arm, is to install the push rod and the rocker arm. Then turn the push rod between your two fingers and tighten the rocker arm nut until the push rod cannot be rotated between your fingers, then give the rocker arm nut and half turn and your done. The reason you do this is to set the plunger inside the hydraulic in the center of the body of the lifter for normal operation during the use of the engine.
2007-02-20 18:22:12 · answer #2 · answered by bigtool 2 · 1⤊ 0⤋
Chevy 350 Rocker Arm Torque Specs
2016-10-18 12:22:02 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Some engines use non adjustable valvetrain. You simply torque the rocker arm jam nut (typically 20 ft-lbs) and its done.
Other engines require you to set the lifter preload. You bump the motor over until the valve is completely closed. Lifter must be on base circle of cam lobe. Then you back off the nut and turn the pushrod with your fingers while slowly tightening the nut. When you can no longer turn the pushrod with your fingers (dont use too much force), you're at 0 lash. Then turn the nut another 1/2 turn. Then proceed to the next valve.
So to answer your question, determine if you have an adjustable valvetrain or not. Some engines that have non-adjustable valvetrain may have been converted to adjustable. This happens sometimes if the engine has had a performance cam installed. Find out what setup you have, then use the correct procedure.
2007-02-17 18:55:55 · answer #4 · answered by electron670 3 · 0⤊ 0⤋
no do not torque push rods. I well try to give you some basic help if the motor has not been run loosen the rocker arms grab the push rod and spin it tighten the rocker arm till you fill a little Resistance agents the push rod this will be pretty close give it a quarter turn and that will be good this is o lash if the motor has run with the lifters in it just go to the resistance part no quarter turn hope this helps
2007-02-17 11:53:28 · answer #5 · answered by master of none 3 · 0⤊ 1⤋
Listen to Gdwrnch40. To the best of my knowledge, all small block Chevys have stud mount rocker arms, and don't require torque. That is for engines with a pedestal mount or shaft mount system. You can look at the manual, but I believe from years of building these the manaul tells you exactly that. No lash, then 1/2 turn. You can re-check them after running if you want.
2007-02-19 03:59:45 · answer #6 · answered by Gary B 3 · 1⤊ 0⤋
From your question, one can tell that you're not experience with this type of correction. Although gdwrinch40 has the hands on feel of how to do this, take the advise of injunRAIV and read a service manual first on the proper way of how to adjust (tighten) the rocker arm screw (s).
2007-02-17 13:05:34 · answer #7 · answered by Anonymous · 0⤊ 0⤋
That motor has hydraulic lifters.Once the slack is out of the pushrod,you give an extra half turn.
2007-02-17 10:30:17 · answer #8 · answered by gdwrnch40 6 · 2⤊ 0⤋
no, you take them down to zero lash and then another 1/2 turn.
2007-02-17 13:35:19 · answer #9 · answered by mister ss 7 · 1⤊ 0⤋
No, it's a pretty complicated process, you set the valve lash with a feeler guage.
2007-02-17 10:23:06 · answer #10 · answered by rustybones 6 · 0⤊ 3⤋