Adjusting Tappets without Gauges

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rvich

rvich

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I have read about using the thread count on the adjusters to get the tappets gapped correctly but can't seem to find the information now that I want it.

Anybody know how many thousandths per turn? Where is this trivia best found?

Thanks,
Russ
 
I never heard of doing it that way before & find it real hard to believe it would be accurate enough given the small incriments we turn them to get just the right pull on feeler gage. Maybe this would be good enough for a starting point though?
 
Russ math won't help. I am sorry but if you get to know that it is an 1/8 of a turn how are you going to see that and know? Just do it, back off the nut use a feeler gage set the valve mark the stem how far before a turn in has you at zero lash? Now practice going back to the spot by your memory than test your memory with the gage. Then practice. It may be easier to use the gage but it's a nice trick to know.
 
1/4 turn = 0.010". This is technique is only usefull if the valve stem tip is dinted.

Mick
 
hayabusaman0 said:
On my T150, 1 turn = .040" I believe the Commando is same thread 5/16 UNF.
Click to expand...

Commando adjusters are [Edit 9/32"] - 26 tpi BS Cycle thread. Whit Form ( 1 turn = 0.0385")
5/16" UNF is 24 tpi. (1 turn = 0.0417")
 
Norton commando workshop manual- 1970 on : Rockers, Adjuster thread size - 9/32in. 26TPI - Whit Form.
What would the math be for this size? Same as above? 26TPI is same amount of turns regardless of bolt diameter, right?
Standard inlet =0.006in.Combat =0.008in.
Standard exhaust = 0.008in. Combat =0.010in.
 
Ok. Based on 26TPI 1 turn = 0.0385in.
0.006in~ 0.15 turns or 54°
0.008in~ 0.20 turns or 72°
0.010in~ 0.25 turns or 90°

Hope that helps someone.

If not, try this-
intake ~ a little bit.
exhaust ~ a little bit more!
:mrgreen:
 
norbsa48503 said:
Russ, see what I mean?
Click to expand...
In a perfect word we would be able to set clearance with a guage. Unfortunately the world ain't perfect.
So, some of us just gotta make due with what we got. Call it what you will...
 
A guy can only try...somedays it is just harder than others...
 
caddy chris said:
Ok. Based on 26TPI 1 turn = 0.0385in.
0.006in~ 0.15 turns or 54°
0.008in~ 0.20 turns or 72°
0.010in~ 0.25 turns or 90°

Hope that helps someone.

If not, try this-
intake ~ a little bit.
exhaust ~ a little bit more!
:mrgreen:
Click to expand...

Pretty funny seeing as how I'm not the one with "dinted" valve stems...ahem...get out your protactor and turn that adjusting screw 72 degrees for inlet and 90 degrees for exhaust...there ya go!
 
Quarter turn out for exhaust. Quarterout and back bit for intake.
I'm sure there are a few other guys out there that could use this info. Thanks!
 
What an amazing world we live in these days. You can get a 32 piece feeler gauge set for under four bucks but can't get a free matchbook at the convenience store or bar! Too bad too seeing as how those covers are just abour right for setting your points!

Russ
 
I apologize if I'm simply portraying my ignorance but is it really hard to set the valves? I did it twice last year and all it involves is pulling the rocker covers and the plugs and turning the engine to until the opposite valve is open. Than all you do is use a feeler gage to judge the gap. Unless I'm doing it fundamentally wrong, the only thing you gain here is not using the gage and the possibility of doing it wrong.
 
When the tops of the valves are worn by the to rockers, which appears to be common on these contraptions, a feeler guage wont work.
 
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