Tip & How-To about Honda Civic

Adjustting valve lash

If the firing order is "1-3-4-2". First put it no.1 piston TOP DEAD CENTER. with the marks aligned. Adjust valve lash according to spec on intake and exhaust. Then turn crankshaft on whatever rotation it is suppose to go eg counter clockwise etc. quarter turn ( four cylinder engine). then adjust number 3 ( firing order 1-3-4-2). Then do the same for cylinder 4 and 2.

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how to adjust valves on Toyota 1991 23re engine


Very carefully my friend. Kidding. Ok, remove the valve cover and anything in your way of removing it. By hand, with a socket and ratchet, on the crankshaft bolt head, turn the engine over to get #1 piston to top dead center on compression stroke. You'll need to find out what the valve lash should be in order to adjust properly, I run the 22R engines and only have specs for that, and have a feeler gage to place between the valve head and rocker arm. Check the gap on the intake valve for it is in position to adjust now because the cam lobe is at the farthest away from the valve. If it needs adjusted closer, turn the nut loose and screw the center in to tighten and out to give more gap, then tighten the jam nut after adjusted. Now turn the crank to bring #3 to top dead center and adjust that intake. Once done go back to #1 exhaust and adjust it. You'll know when the #3 is TDC when the rocker is loose on intake valve along with #1 exhaust. Now bring #4 piston up to TDC and adjust intake valve. Like I said, you'll know when it's @TDC when that rocker is loose, but with the spark plugs out you can stick a screwdriver in the plug hole to be sure it's up. Firing order on 4 cylinders is 1-3-4-2 so do your adjustment in that order for each intake valve and go back to the last one adjusted and do the exhaust valve.

Dec 01, 2014 | Toyota Cars & Trucks

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Cam shaft


put the notch on crank pulley align with tdc (top dead center mark) on timing cover

Remove valve cover, firing order for a 4 cylinder engine 1342, piston 1 and 4 are up in same time,rocker arm on cylinder 1 intake and exhaust must have play, while on cylinder 4 must be in overlap both valves starting to open (partly depress),if no timing mark inser a screwdriver throught sparkplug opening turn gently to get the piston at tdc if so valve timing is ok without checking any mark,if you remove the cover you will see the mark at the right place

1 and 4, 3 and 2 are companion piston, you could do the same with 6 or 8 cylinders, you must know firing order

Aug 14, 2014 | Cars & Trucks

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setting valve clearances


360 with hydraulic lifters, the crankshaft wit a ratchet and socket to get each valve closed. When lifter is at bottom turn the valve adjuster out to where you have free movement then turn adjuster till the rocker arm touches the lifter, then turn the adjuster in three quarters of a turn, and that valve is adjusted. No other clearance is required on hydraulic lifters. Do this with each valve in turn as each piston comes to top dead center using the firing order as a guide. When #1 piston is up to top dead center, both valves are closed. Adjust intake and exhaust at this time. Then the next in the firing order. The firing order can be found on the intake as is each cylinder marked with it's number. If it were a Chevy small block, for example only, firing order is 1-8-4-3-6-5-7-2. I would bring # 1 cylinder up to top dead center on compression stroke by removing that spark plug and stick my finger in the hole and crank the engine till I felt my finger being pushed away with compression, then bring that piston up till the timing mark was on the "0" of the timing tab at drivers side of the harmonic balancer on the crank. Adjust both valves on #1 cylinder and then turn the crank until both valves of #8 cylinder were free moving at the rocker. Then to the next in order of fire. I would turn each adjuster out at least one full turn before starting this procedure, then adjust them in order of firing starting with #1. It isn't hard, just takes time to do it right.

Aug 12, 2014 | AMC CJ7 Cars & Trucks

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the car doesn't start good or idle. I changed the timing belt and lined up the marks exactly.


This is a common problem. The marks you are talking about actually line up several times during the cycle of the motor. You need to turn the motor by hand until the number 1 piston is all the way up and the next piston in the firing order is starting it's upward movement, this is Number 1 Top Dead Center. Look at the valves and make sure that both valves on the number one are closed and only the intake valve is open in the next cylinder to fire. That should set the valves to Number 1 TDC. Then align the timing marks and replace the timing belt or chain. This should but you at 0 degrees timed and allow you to be able to adjust the timing as needed to get the motor running smoothly. Good Luck.

Jul 05, 2011 | Dodge Stratus Cars & Trucks

1 Answer

Rocker arm torque specs on a 97 gmc jimmy 4.3


  1. For the 4.3L engines which are equipped with screw-in type rocker arm studs with positive stop shoulders, tighten the rocker arm adjusting nuts against the stop shoulders to 20 ft. lbs. (27 Nm) on 1994-96 models and 18 ft. lbs. (25 Nm) on 1997-99 models. No further adjustment is necessary, or possible.
  2. For most 4.3L engines which are not equipped with screw-in type rocker arm studs and positive stop shoulders, properly adjust the valve lash. For details on valve lash adjustment, please refer to the procedure in Routine Maintenance . (see below)
4.3L Engine

The 4.3L engines may be equipped with either of 2 rocker arm retaining systems. If your engine utilizes screw-in type rocker arm studs with positive stop shoulders, no valve lash adjustment is necessary or possible. If however, you engine utilizes the pressed-in rocker arm studs, use the following procedure to tighten the rocker arm nuts and properly center the pushrod on the hydraulic lifter:
  1. To prepare the engine for valve adjustment, rotate the crankshaft until the mark on the damper pulley aligns with the 0? mark on the timing plate and the No. 1 cylinder is on the compression stroke. You will know when the No. 1 piston is on it's compression stroke because both the intake and exhaust valves will remain closed as the crankshaft damper mark approaches the timing scale.

Another method to tell when the piston is coming up on the compression stroke is by removing the spark plug and placing your thumb over the hole, you will feel the air being forced out of the spark plug hole. Stop turning the crankshaft when the TDC timing mark on the crankshaft pulley is directly aligned with the timing mark pointer or the zero mark on the scale.
The valve arrangement is as follows:



E-I-I-E-I-E (right bank-front-to-rear) E-I-E-I-I-E (left bank-front-to-rear)

  1. With the engine on the compression stroke, adjust the exhaust valves of cylinders No. 1, 5 & 6 and the intake valves of cylinders No. 1, 2 & 3 by performing the following procedures:
    1. Back out the adjusting nut until lash can be felt at the pushrod.
    2. While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
    3. When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turns.

  2. Rotate the crankshaft one complete revolution and align the mark on the damper pulley with the 0? mark on the timing plate; the engine is now positioned on the No. 4 firing position. This time the No. 4 cylinder valves remain closed as the timing mark approaches the scale. Adjust the exhaust valves of cylinders No. 2, 3 & 4 and the intake valves of cylinders No. 4, 5 & 6, by performing the following procedures:
    1. Back out the adjusting nut until lash can be felt at the pushrod.
    2. While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
    3. When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turn.

Sep 23, 2010 | 1997 GMC Jimmy

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