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Why the different size push rods if they don't need adjusting?

2 of the push rods are about .025" longer than the other two. I put the longer ones on the intake valves.

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Because there is a difference in distance from the valves to the lifters. Put them in the wrong place and you can damage the engine.

Posted on Dec 01, 2014

Testimonial: "Thankyou Koko I'll check the valve numbers."


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SOURCE: Only running on one cylinder. Have checked valve

You check here?

Normally, if only one cylinder is running, I would be checking electrical first then fuel, not valve clearance.

Posted on May 30, 2011

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Have changed clutch and master and slave cylinders on my freelander 1.8 and still cannot get it in gear. Any suggestions please

You might have bent the drive plate when putting the gearbox back in! You can not let any weight of the gearbox hang on the plate when putting it back in it will bend the plate only other thing could be air in the line incorrect adjustment ,wrong size cyl.or if the push rod is non-adjustable put a longer adjustable rod into try.

Oct 03, 2015 | Cars & Trucks

1 Answer

Push rod diagram

Exhaust push rods are longer
  • 6.0740 Inch Overall Length
  • Standard Size
  • Intake valves are
  • 5.7460 Inch Overall Length
  • Standard Size. Front head.
front head standing in front of car passenger to driver side
Ex , in ,in Ex ,in Ex

rear head standing in front of car passenger to driver side
Ex. ,In , Ex , In , In , Ex

remember exhaust push rods are longer
Rocker arm bolt ................................ 124 lb. 30 degrees

Apr 21, 2014 | 1999 Pontiac Grand Am GT

1 Answer

I am replacing the head gasket on my 2000 pontiac grand am 3.4L engine. The push rods got mixed up and i need to know if the shorter rods go on the intake or exhaust side?

As you assemble things, it will become obvious as to whether you're attempting to put in a wrong length push rod. If it is wrong, it will appear that you need to adjust the rocker arm way different than it was originally to make it work. They just will not readily interchange. I think you'll do just fine.

Dec 03, 2013 | GMC Cars & Trucks

1 Answer

How to fit new push rod cover cups

On your bike the factory stock push rods do not adjust.

So, you'll have to remove the top of the rocker covers, remove the rocker arms, remove the push rods (keep them in order, as they are different lengths and need to go back in the same spot they came out of) remove the push rod tube clip, and collapse and remove the push rod tube assembly.

Once out, disassemble the push rod tube, then reassemble with the new push rod cup.

Reassemble everything, putting the push rods in the same spot the came out of (again, they are different lengths)

Mar 21, 2013 | 2002 Harley Davidson FXSTD - FXSTDI Deuce

1 Answer

Replaced the heads with rebuilt heads on a 2000 Malibu . Idles a little rough and the exhaulst suxs back in too. Iv replaced all spark plugs and wires and new gaskets all the way up. What could cause this...

These engines have different size push rods for the exhaust valve, did you mix them up by mistake, that is a common problem, i am almost positive that exhaust push rods are a little longer than the intake ones, good day, let me know.

Oct 01, 2012 | Cars & Trucks

1 Answer

Adjusting Timing Chain

Push rod,you have two different size,or firing order is wrong. The intake push rod are 5 3/4 inch long, the exhaust are 6 inches long,Disable the spark and crank the engine the sound should be smooth and even,if its not correct the push rods.If it is correct the firing order

Mar 15, 2012 | Cars & Trucks

1 Answer

2001 low rider push rod one is longer where does it go exhaust or intake

Hi Anonymous, for big twin engines solid pushrods come in different lengths, depending on the manufacturer all four could be different lengths or only three will be different and two will be the same. Push rods that are the exactly the same length go into the intake slots. Sportster push rods will come in two different lengths the short ones go into the intake slots and the long ones go into the exhaust slots. For Big Twins that have four different lengths the order from shortest to longest is as follows: Rear Intake, Front Intake, Rear exhaust, Front Exhaust. Some OEM push rods will have colored bands that can be mismarked or the bands could partially or fully wear off, thats why I only go by length. Good luck and have nice day.

Feb 21, 2012 | 2001 Harley Davidson FXDL Dyna Low Rider

2 Answers

00 buick century 3.1 70,000mile just had a head job done, car is missing on # 1 and 5 cyclinder, wen i tighten the rocker arms i have no compression, but wen i lossing it then i got compression i change...

There are two different size push rods on that engine. The longer ones are for the exhaust valves. If you have an exhaust push rod switched with an intake push rod it can cause the problem you are describing. Usually you will bend a valve when you get them mixed up.

Jan 23, 2011 | Buick Century Cars & Trucks

1 Answer

Need first steps to adjusting push rods didnt mark the pushrods as we removed them the bike is 80 cubic inch electra glide 1994

Uhh, if the pushrods in your 1994 model bike were stock, they are not adjustable. They should be color coded at to where they go. If this is what you have, they go in the following positions:
Purple - Rear Exhaust
Blue - Rear Intake
Yellow - Front Intake
Green - Front exhaust

Now, if they have been changed to adjustable push rods by you or some previous owner, the first thing you have to do is figure out how many turns of the adjuster it takes to make the pushrod 0.100" longer. Turn the adjuster all the way inward making the pushrod as short as possible. Now, using a caliper, turn the adjuster outwards until you get a measurement of threaded rod that is exactly one hundred thousandts long. Then turn the adjust all the way back inward while counting the number of "flats" on the hex adjuster that you turn until it bottoms out. You must do it this way because different manufacturers of the pushrods use different thread pitches on their adjusters.

Once you know how many "flats" it takes to make the pushrods 0.100" longer install the pushrod into a position with the tappet all the way down. Adjust the pushrod out using your fingers until you get all the slack out of the pushrod. Then turn the pushrod adjuster outwards the number of turns that it takes to make the pushrod exactly 0.100" longer.

Once this is done, you will not be able to turn the pushrod. You must wait for the hydraulic tappet to bleed down before you can turn the engine. If you do turn the engine before the tappet bleeds down, you may bend the valve. Do not turn the engine until you can turn the pushrod with your fingers. Proceed until you get all pushrods installed and adjusted in this manner.

Ride Safe,

Jan 17, 2011 | Harley Davidson FLHT Electra Glide...

1 Answer

How do I replace the lifters on a 1999 twin cam HD. I have adjustable pushrods installed

This can be a big zero on the fun scale, so get ready. First place your bike on a lift (borrowed or owned, just get one) with rear wheel off the ground. Now remove your air cleaner and maybe your filter. Now drop the pushrood tubes one at a time, not all at once (pick a jug only one). With the bike in gear and holding the pushrod tube up so you can see the bottom part of the push rod, rotate engine until you are on flat side of the cam. You'll know when the push rod is as low as it can be and the wheel moves a little and the push rod doesn't. Your push rods have a jam nut on them and the pushrod is not round in places you must loosen the jam nut and then holding both pieces of the pushrod you can screw the lower end of the push rod into the other piece. This will shorten the push rod. BE VERY CAREFUL NOT TO DROP THE JAM NUT. If you do you will be cussin for a month! Now you can shorten the push rod enough to get it out. Work only one cylinder at a time and yes note which push rod goes where as most HD ones have different diameter ends.
Soak you lifters in oil overnight, not for most of the morning or a few hours, but overnight. Once you get both push rods out use your fingers, a small pick, or what ever to pull the lifters out. Replace the lifters, O rings for push rod tubes, put the tubes over the push rod and looking at the lifters make absolutely sure they are in the lowest position they can be, adjust you push rods. If they are HD Screamin Eagle ones you extent the push rods to what we call zero lash, that is until they make firm contact with the lifter but are not compressing the lifter. this is just something you gotta do to figure out how. Then once you have zero lash HD sez unscrew or lengthen the push rod by holding the top piece with a wrench and unscrewing the bottom piece 3 and one half turns, then lock it up with the jam nut. Put push rod tubes together move to the next cyclinder.
Work on a completely COLD bike!!
Soak lifters over night
Use new O rings
Adjust push rods absolutely at zero lash + 3.5 turns (if HD) when lifter is lowest in bore.

This is a painful process cause after things get a few hours on them you WILL want to go back in and readjust. I am truely sorry this is such a pain. I hope this helps and good luck,


Aug 29, 2009 | 2000 Harley Davidson FLHR-FLHRI Road king

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