Adjusting Valves Fj60 - what is proper technique? (1 Viewer)

[Beehanger]

Hi all,
Trying to figure out the nuances of feeler gauges as I adjust the valves on my fj60, 2F. Drove it for about 300 miles, now its time to readjust. I'm getting some clank and vacuum is running slightly low (should be 14.5 at altitude, I'm at 13.8 HG).

Here's the video:




My question is, what's the proper way to use feeler gauges? It seems like guys in tutorials don't jam them in there, but just some light tension. When I did the hot and cold measurements by fitting in the biggest feeler gauge humnaly possible its telling me the following....:

Fitting in the biggest size I can, it's telling me I'm off by .4mm which seems like dropping it a lot. For instance, I had .6mm measured on my #1 rocker HOT with it running. It should've been it .35mm according to FSM. So if I drop it by .25mm to make up for this discrepancy, (With it cold I'm showing it at .45mm) then it would take me down to .2mm cold. This seems LOW, especially when the book calls for .40 mm cold for comparison.

All of the valves have similar gaps, and the measurement would be pretty tight if I drop #1 to .2mm as an example. Don't want to have to do this again, so double checking.


Please watch my video explaining my delima, hard to know what to "feel for" when you haven't been showed before.

Thanks
Dan

 

[Pighead]

I adjust for a gentle slide in and out. Looking to get just a molecule or two of oil between surfaces. I never push or pull with all my strength

 

[OSS]

For 30 years I always checked the valve clearances with the engine idling and hot.

1. Check all the exhaust valves with the correct feeler while engine is idling.
2. Turn off engine, make small adjustments with wrench & screwdriver.
3. Turn engine back on & check them again.

It takes a few rounds doing it that way but it’s the easiest to get them all right on.

This is the method the FSM recommends.

 

[Beehanger]

FOund this video which was helpful

Thanks guys,
Dan

 

[Combat Wombat]

Great explanation and short video, helps alot with understanding the issue
Honestly I'd look at getting another set of feeler gauges.
I have seen those dual thickness ones have a huge variation in actual thickness versus declared thickness shown.
They could very well be ok, but if you have access to some vernier calipers (calibrated of course) maybe check/verify the thickness of them.
New set of single thickness gauges isnt too expensive either....

 

[Beehanger]

Great explanation and short video, helps alot with understanding the issue
Honestly I'd look at getting another set of feeler gauges.
I have seen those dual thickness ones have a huge variation in actual thickness versus declared thickness shown.
They could very well be ok, but if you have access to some vernier calipers (calibrated of course) maybe check/verify the thickness of them.
New set of single thickness gauges isnt too expensive either....

Well, I adjusted ‘‘em with the dual thickness cause it was the only guage set that had the sizes I needed….
They looked old schools so hopefully they’re fine.

Vacuum is still 14 at altitude but the truck sounds better, I had pretty damn tight valves before which isn’t good. (Only drove 209 miles)
Truck is running better, who knows may have to adjust one more time. Have some Amazon 32pc ones coming it be mail.