Adjusting Valves Instructions? - Toyota FJ Cruiser Forum
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#1 (permalink) Old 02-09-2008, 08:39 PM
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Adjusting Valves Instructions?

Has anyone ever adjusted their own valves before? I'll be doing this tomorrow on my Rover since my valves rattle like a diesel and shouldn't. I hear it's easy - but is there anything I should look out for?

Feeler should be at .010 and I'm adjusting by 'rule of nines' -

stupid question though - how do I tell what valve is valve1 and which is valve 8, etc?

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#2 (permalink) Old 02-10-2008, 02:05 AM
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Re: Adjusting Valves Instructions?

I am not familiar with your particular engine and I don't know what the rule of nines is, but here goes anyway. You can tell when an individual cylinder is at top dead center or close to it by rotating the crank manually while observing the rockers and crankshaft timing marks. TDC is indicated when both the intake and exhaust rockers are stationary and don't move when you turn the crank in either direction from the timing marks. The valves will be closed and the cylinder will be on the compression stroke. Frequently the intake and exhaust valves will have different lash specs meaning maybe 0.010 on intake and 0.012 on exhaust. That is not always the case, but it's fairly common. Also there will usually be a different spec for a cold engine vs. a warmed up engine.

Then it's a matter of checking the clearance with the feeler gage and adjusting the rocker by loosening the lock nut and turning the screw then tightening the locknut. Check it again after you snug down the lock nut to be sure you did not inadvertently change the clearance when tightening the locknut.

This basic procedure is for non-hydraulic valve lifter designs. The procedure for hydraulic lifters can vary somewhat with particular designs, but frequently it is something like tightening the adjuster all the way down and then backing it off a prescribed number of turns and locking or something like that. You need to refer to a service manual to see what the exact procedure is for your engine.

I skimmed over the procedure in the service manuals for our FJ's and unless I missed something it looks like changing valve clearances is much more involved and requires actually removing and replacing the lifters to make adjustments. That could make it really tough for shade tree mechanics to tackle. As I said, I only briefly skimmed over the procedure. I may have this all wrong for the FJ.

Adjusting the valves on solid lifter type vehicles is a straightforward procedure. Hydraulic lifters will probably require reading the service manual to determine how it is to be done. The advanced high tech engines may require procedures unique to that particular engine and it's best to read up on it before you dive into the job. That is generally good practice for all maintenance procedures.

Hope this is of some help to you.

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#3 (permalink) Old 02-10-2008, 02:13 AM
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Re: Adjusting Valves Instructions?

Here's the "rule of nine" that OP mentioned.
Quote:
The "rule of nine" implies that you add 1 to the number of valves - the engine has 8 valves, thus adding one reads nine. When valve #1 is fully open, you check and adjust #8 (1+8=9). You will have to turn the engine around a lot if you work your way through the valves one by one from #1 to #8.
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#4 (permalink) Old 02-10-2008, 05:23 AM
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Re: Adjusting Valves Instructions?

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Fjamming previously said: View Post
Here's the "rule of nine" that OP mentioned.


Adjusting valves.
this is the correct way......this is the way i used to do it.....remove all spark plugs.....take off the valve cover......get out the hand crank....and turn to the first valve is up....then start you rule of nines......easy.......just set lash at .010 hot or cold.....with the hand crank you will see how the valves work....RR
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#5 (permalink) Old 02-10-2008, 06:16 AM
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Re: Adjusting Valves Instructions?

Quote:
Catt22 previously said: View Post
You can tell when an individual cylinder is at top dead center or close to it by rotating the crank manually while observing the rockers and crankshaft timing marks. TDC is indicated when both the intake and exhaust rockers are stationary and don't move when you turn the crank in either direction from the timing marks. The valves will be closed and the cylinder will be on the compression stroke. Frequently the intake and exhaust valves will have different lash specs meaning maybe 0.010 on intake and 0.012 on exhaust. That is not always the case, but it's fairly common. Also there will usually be a different spec for a cold engine vs. a warmed up engine.

Then it's a matter of checking the clearance with the feeler gage and adjusting the rocker by loosening the lock nut and turning the screw then tightening the locknut. Check it again after you snug down the lock nut to be sure you did not inadvertently change the clearance when tightening the locknut.

This basic procedure is for non-hydraulic valve lifter designs. The procedure for hydraulic lifters can vary somewhat with particular designs, but frequently it is something like tightening the adjuster all the way down and then backing it off a prescribed number of turns and locking or something like that. You need to refer to a service manual to see what the exact procedure is for your engine.
Quote:
River Runner previously said: View Post
...remove all spark plugs.....take off the valve cover...

What they said. You can use a breaker bar or big long ratchet and the appropriate-size socket on the front crankshaft nut to turn the engine clockwise as needed. On an in-line motor, once you get #1 cylinder to TDC on the compression stroke with the timing marks you can just turn the motor another 180/360 degrees and there will be a different cylinder at TDC so you can adjust the valves on that cylinder. Repeat until you run out of cylinders.

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#6 (permalink) Old 02-10-2008, 08:51 AM
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Re: Adjusting Valves Instructions?

thanks guys hopefully the Rover won't sound like a diesel anymore when I'm finished

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#7 (permalink) Old 02-10-2008, 12:15 PM
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Re: Adjusting Valves Instructions?

I have always used my remote starter switch for turning over the engine. ump, bump... does wonders at the track
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#8 (permalink) Old 02-13-2008, 01:12 PM
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Re: Adjusting Valves Instructions?

thanks for the help guys - I used the crank and slowly turned over the engine and adjusted it using the 'rule of nines'. It was a LOT quieter when i was finished....felt great to do my own work and not blow up the engine

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#9 (permalink) Old 02-13-2008, 01:16 PM
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Re: Adjusting Valves Instructions?

And a qoute from the above Link...

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...And please: Do not forget the spanner you left on the crankshaft!

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#10 (permalink) Old 02-13-2008, 01:22 PM
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Re: Adjusting Valves Instructions?

Quote:
Bostonian1976 previously said: View Post
thanks for the help guys - I used the crank and slowly turned over the engine and adjusted it using the 'rule of nines'. It was a LOT quieter when i was finished....felt great to do my own work and not blow up the engine
Great! Good to hear.


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