Step 3 Valve checking time
First thing of in this step, there is 2 ways of doing this, you can refer to the manual, follow instructions. Align TDC mark on Cylinder 1, measure with feelers, then have to rotate 180 for C 2, then 360degree for 4, then have to go back to 3 at 540degrees. Honestly, felt too complicated, but if this is the way you want to doit, then go for it, make sure to read up in service manual.
Second way of checking valves, making it simple, but more time consuming is just turn over the crankshaft until lobes face directly straight up. Example, turn crank some C1 intake lobes are straight up, use feelers, get measurements, then crank again till exhaust lobes face straight up on C1, then use feelers to get measurements. With the lobes facing straight up, means most room between lobe and bucket.
So lets get started.
Pic 1: Use socket wrench with 14mm, crank engine counter clock wise as manual says.
P2: Cylinder 1 at TDC, lobes not straight up, but facing away from the buckets where they push down on.
P3: Before placing feeler gauge between lobe and bucket, there is "oil pools" around exhaust lobes, dip the feeler gauge in those so the gauge has lube to help when using gauges.
P4: Showing turned camshaft to have lobes on Cylinder 1 facing straight up.
P5: With the lobes on Cylinder 1 facing straight up, start with high gauge, then work way down. Intake specs are between .11-20mm ( 0.0043 - 0.0079 inch), exhaust specs are between .21-.25mm ( 0.0083 -0.0098 inch).
So start with C1, lobes facing straight up, take largest feeler for spec, 0.008 feeler, dip in oil, and try to place between lobe and bucket, do not try to ram it in there, if you can't get 8 thou between then that a good start, meaning at least not tons of room or something getting worn down.
Now start working way down, if you can fit a .007 or 0.006 then thats great news, because you are within spec ( if you can fit 6-7thou, then your going to be abail to fit smaller ones in, thats why work from highest to lowest), but say if you start getting to 0.006, cant fit that one between, then goto 0.005, still doesn't fit, then you get to .004 and still doesn't fit, that means lobes are to tight, and would need shimming, either too much gap, or very very tight gap needs shimming. And .004 is very tight, average human hair is between 0.002-0.004 thickness.
So that's just 1 lobe, there is 3 lobes for each intake, and only 2 lobes on exhaust. So 20 lobes in total to check, take time, use different feeler sizes,
and to help get accurate results bend the feelers, almost like L shape to get under lobe.
For those out of spec, refer to service manual. Sections 3-11 to 3-16. Included pics 6,7,8,9,10,11.
To also help out, here's some vids i found on youtube to explain and show how to use feeler gauges and what goes on inside your engine.
This video explains timing and what goes on inside an engine.
car engine, but pretty good info.