Spark plug diagram meaning?

[klaudmjj]

Just bought some sparkplugs and planning to replace soon. There is a diagram on there which tells you how much to tighten it I believe, correct me if I’m wrong but this shows to hand tighten first and go in with a ratchet and go 1/16th of a turn and 1/2-2/3 of a turn if it’s a different type?
So for mine it would be 1/2-2/3 of a turn?

[anonymous-user]

klaudmjj said:

Just bought some sparkplugs and planning to replace soon. There is a diagram on there which tells you how much to tighten it I believe, correct me if I’m wrong but this shows to hand tighten first and go in with a ratchet and go 1/16th of a turn and 1/2-2/3 of a turn if it’s a different type?
So for mine it would be 1/2-2/3 of a turn?

I'd say you are correct.

[catman]

The OP's spark plug looks like it has a tapered seat, not a compression washer. I disagree.

[sliks]

The picture is supposed to show two different designs of spark plug, one with a tapered seat and the other with a flat seat

Both look a bit tapered to me but obviously the non tapered plug needs the higher torque

[Zoobeef]

The 1/2-1/3 is for the type with a crush washer. Yours looks like a tapered seat.

[gazza285]

The pictures on the box are left hand thread...

[hellorent]

As catman says tapered seat, I'd do hand tight & then 1/8 of a turn

[klaudmjj]

They both look tapered on the picture, one just shows a smaller one and comparing my spark plug to the picture, it looks like I have the smaller taper, but will tighten less. Better to not over tighten.

[klaudmjj]

Okay, just looked up the part number:
NGK PTR5A-10 5055
It is a tapered gasket seal so I will do 1/2-2/3 of a turn.

EDIT: Nevermind, it is actually a taper seal my bad. Had a proper look on NGK website.

Edited by klaudmjj on Tuesday 9th March 18:07

[louiechevy]

Its the 1/16th turn plug anymore than that and you may have a hard time getting then undone next time, I've been a mechanic for thirty five years.

[hellorent]

^^^^^^^^^^^^^^^ This all day long, listen to what experienced people are telling you, unless you want to snap the plug when you try to remove it.

[E-bmw]

The first part of the pic clearly shows a tapered seat and clearly states 1/16 turn, so that is that you need to do.

The second part of the pic clearly shows a crush washer on the set & that isn't what you have.

Simples!

[louiechevy]

klaudmjj said:

Okay, just looked up the part number:
NGK PTR5A-10 5055
It is a tapered gasket seal so I will do 1/2-2/3 of a turn.

EDIT: Nevermind, it is actually a taper seal my bad. Had a proper look on NGK website.

Edited by klaudmjj on Tuesday 9th March 18:07

When you do them up just seat them down by hand and then 1/16th is next to nothing, I just give each plug a gentle pull on the ratchet and leave it at that. If there a bit hard to screw in by hand I use the ratchet and hold the head rather than the handle so you can feel when the tapper contacts the head.