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.
AT 4x4, (CQ) Convenience Pkg, (GY) Airbags, (UR) Upgrade #2, (C8) Rock Rails & Skid Plate, (DH) Towing Hitch, (WL) 17" Alloys, (Z2) 5 pc All Weather Mats/Rear Door Storage/First Aid Kit/Passenger Arm Rest, (3T) Roof Rack
MODS: TRD CAI, Spare Tire Cover, Precision Fit Ballistic Nylon Seat Covers, Warn Receiver Shackle, Sylvania Silver Star Ultra Headlights, LED Dome Light conversions, Puck Light Mod, Under Hood LED Lighting, Aux Backup Lights