A better exhaust gasket
- Thread starter Chainlube
- Start date
Each S/P manufacture may have their own torque settings. As some with a tapered seal say 1/16 turn
But the basic rule of thumb is
First hand tight
10 mm S/P 1/4 turn
12mm S/P 3/8 turn
14mm S/P 1/2 turn
But the basic rule of thumb is
First hand tight
10 mm S/P 1/4 turn
12mm S/P 3/8 turn
14mm S/P 1/2 turn
Chainlube
Well-Known Member
I don't know about that, I wouldn't be able to get a 1/2 turn out of the ones on my GMC. If you turn a plug on one of these things too much you could strip it out. And, definitely crush the sealing ring with 1/4 turn.
Should probably look up the torque settings for the brand plug your using, If your unsure.
But I understand with these cheep China aluminum heads ya gotta be careful and not strip the threads out. I wouldn't go past 1/4 turn
Excuse me for not being clear.
Do ya know where the saying "rule of thumb" comes from?
In the old days it was legal to beat your wife with a stick no thicker than your thumb
Ya know, I have changed S/P so much I just go by feel now a days. Your probably right Between 1/8 and 1/4 of a turn is all I'm probably tightening it. I do know once I put a S/P in and if I ever take it out. The next time I put it in it's only gonna be a 1/16 or 1/8 of a turn to get it tight, Cause the crush washer has already been crushed.
However I did notice if the crush washer is not seated and kinda hung up on the last of the S/P threads it takes more than a 1/2 a turn to get the S/P tight, That always freaks me out, like I think i just striped the threads. Then I check and it's fine. So I try to always remember to make sure the crush washer is seated correctly on the S/P before screwing it in
Chainlube
Well-Known Member
If the crush washer on my plug looks a little effed, I'll just get a new plug. That pretty much only happens when I buy a piece of used equipment.
The moral of the story is, Don't crank down on it.
The moral of the story is, Don't crank down on it.
wolframore
Active Member
I wish they would machine the spark plug holes flat to begin with. Watch for voids in the casting. I’ve seen some ugly ones.
Joshyaddow
Active Member
What size round drill bit is that you use to cut center hole
Chainlube
Well-Known Member
Use a step drill, and depending on the size of the exhaust port you might have to make it bigger with a high speed rotary tool with a grinding cone on it.
I suggest not to use a step bit it won't cut the gasket material clean or fast like a hole saw will.
Measure the exhaust hole and use the nearest size hole saw. Like shown in post #26 & #28
I made gaskets for a Whizzer 4 stroke 138cc Flathead and drilled the hole to 7/8" which is = to 22mm
But I had to enlarge the exhaust gasket hole to 23.35mm using a 1" grinding stone that I tapered myself to fit the cyl exhaust hole perfect.
If the hole saw will only get the gasket close to the DIA ya need you can finish it off like I did. But I'm sure there are other ways to skin a KAT
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