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adding an extra crush gasket to spark plug

chuck machinist

chuck machinist

Well-known Member
I have acquired an ag tractor, and found several spark plugs had an additional crush gasket installed. Any thoughts on why this would be done. I would tap the threads in the head, if I could not get a plug to seat Thanks in advance.CM>
 
(quoted from post at 20:23:00 01/29/19) I have acquired an ag tractor, and found several spark plugs had an additional crush gasket installed. Any thoughts on why this would be done. I would tap the threads in the head, if I could not get a plug to seat Thanks in advance.CM>
Click to expand...
y WAG is that they were trying to make a home made anti-fouler to cause plug to run hotter.
 
Somebody wasn?t looking when they took the old plugs out. Washer got left in the hole, and new plug and washer screwed in on top of it.
 
(quoted from post at 19:42:55 01/29/19)
(quoted from post at 20:23:00 01/29/19) I have acquired an ag tractor, and found several spark plugs had an additional crush gasket installed. Any thoughts on why this would be done. I would tap the threads in the head, if I could not get a plug to seat Thanks in advance.CM>
Click to expand...
y WAG is that they were trying to make a home made anti-fouler to cause plug to run hotter.
Click to expand...

Jesse, I don't often disagree with you, but I'm gonna THIS time.

Gonna GUESS the P.O was a BLEM, just like the guys that leave the old oil filter gasket in place and spin on a new oil filter.

That being said, over the years I've seen quite a few sparkplugs with extra "gaskets" in old trucks, tractors, and cars, that came from P.O.'s I doubt were "adventurous" enough to worry about "indexing" sparkplugs.

But, what the heck?
 
Did it have the correct plugs for the engine in it? I mean, were the sparkplugs longer than the original, either with longer threads or an extended tip?

Back in the day, to avoid tearing down a well worn engine just to repair a stripped plug hole, I put a longer plug in. (Briggs and Stratton opposed twin engine.) It rattled a bit and i wondered if the plug was hitting the piston. That was several years ago and that engine is still running and still rattling. The last time I serviced it that spark plug did not want to back out of the hole. It was still firing, so I left it. I probably should have doubled up the gaskets on it.
 
I put some plugs in a 46 Dodge flat head 6 once that were too long, if I would rev it up too much it seemed like the valve would float up and close the gap! It didn't start too well so I would take the plug out and re-gap it without shutting it off.
 
(quoted from post at 01:42:55 01/30/19)
(quoted from post at 20:23:00 01/29/19) I have acquired an ag tractor, and found several spark plugs had an additional crush gasket installed. Any thoughts on why this would be done. I would tap the threads in the head, if I could not get a plug to seat Thanks in advance.CM>
Click to expand...
y WAG is that they were trying to make a home made anti-fouler to cause plug to run hotter.
Click to expand...
I've run into this before. Sounds like a good guess.
 

I don't think that I have ever had a spark plug washer stay in the hole. In fact I don't think that I have ever had a spark plug washer come off without fighting it.
 
......That being said, over the years I've seen quite a few sparkplugs with extra "gaskets" in old trucks, tractors, and cars, that came from P.O.'s I doubt were "adventurous" enough to worry about "indexing" sparkplugs.
Click to expand...

I was pretty much joking about indexing the plugs. Shoulda put a smiley in the post.
 
If a engine is "burning oil", the excess oil leaking into the combustion chamber tends to foul the plug tip and inhibit the spark; in such cases, a plug with less protrusion than the engine would normally call for often collects less fouling and performs better, for a longer period. Probably the reason for the extra washer.
 
I have had that with one they would not seal, two would and no I never had the tools towork on engines. Was just a way to keep things running. Don't remember what it was on.
 
We indexed spark plugs when we drag raced in the 70s. If not the piston would hit the plug.
Ron
 
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