Spark plug gap and torque?

EWC88 · Aug 24, 2016

I don't have a manual, what should the gap be as well as the torque specs for a 2002 4.7l motor for spark plugs? Replacing with stock champion but need to make sure gapping is correct and them being snug.

dexter · Aug 24, 2016

I don't have the answer - but I'd suggest getting a Haynes manual - lots of good info.

07MegaCabRam · Aug 24, 2016

Ask the parts store next time. They always print it out for me. I know on the Hemi it was .045.

Some anti-seize on the threads and just snug the plug down. I normally just grab the ratchet as close as I can to the sock and tighten it. The closer/shorter the handle - the less leverage/torque you'll get. It doesn't need much..

07MegaCabRam · Aug 24, 2016

EWC88 said:
I don't have a manual, what should the gap be as well as the torque specs for a 2002 4.7l motor for spark plugs? Replacing with stock champion but need to make sure gapping is correct and them being snug.

CHAMPION 439 Copper Plug Gap .040; OE Plug

EWC88 · Aug 24, 2016

Yea I believe it's champion RC12MCC4, atleast champion websites item number.

I'll ask the parts store if they can print it out for me, also look to see if they carry those books.

I did read just do it snug but then saw others saying torque it down, I don't own a torque wrench yet, need to get one. But I was thinking how the hell does a torque wrench fit all the way to the back plugs.

ST-8 · Aug 24, 2016

I could of sworn it tells you the recommended gap of the plugs under the hood, or at least it does on mine

07MegaCabRam · Aug 24, 2016

yeah, I think you're right ST-8.. There was a sticker on my 2007..

EWC88 · Aug 27, 2016

Question, was at local parts store, need to get spark plug socket and they had a boat load to pick. Choices were; magnetic socket, spark plug non magnetic socket, swivel spark plug socket magnet, extension spark plug socket.

What would be the best? I have universal joint sockets so I can swivel, but any help I appreciate!

07MegaCabRam · Aug 27, 2016

I hear a thin wall is best and if it's got some sort of device to hold the spark plug in, that is best.

EWC88 · Aug 30, 2016

Since I am going go out and buy everything this week I have one more question. Should I replace (I believe it is called this not sure) the coil plug as well since its original?

07MegaCabRam · Aug 30, 2016

coil pack. Nope. No need.

Rustycowl69 · Aug 30, 2016

I've never changed plugs on a 3rd/4th Gen Hemi, but I am told it is a good idea to buy some dialectric grease to lube the coil pak boots before you reinstall them. This is so they don't stick to the plugs and tear the boots for the next plug change. oh yeah, this is for 4.7L, It's a little different, advice to lube spark plug boots is still applicable.

EWC88 · Sep 6, 2016

Got everything needed, last question. Should I put antiseize grease on threads? I thought I read the 439 plugs don't need it but want to double check.

JAMMAN · Sep 6, 2016

I don't. Why? It SEEMS like a good idea, I had a plug back out on me one time. Just once and it was a long time ago and I used silver anti seize compound.. I have never to this date had one freeze up in the head. Others might have , I never have.

EWC88 · Sep 7, 2016

O-rings look fine to you guys? See I cracks just dirty

JAMMAN · Sep 7, 2016

Looks like it is already letting dust in. I don't consider it a "critical" item, it keeps most dust and most moisture from getting in. When I pull one I always blow in the hole with compressed air before removing the spark plug itself.

What you have there is pretty typical if not a little on the clean side actually.

I did replace mine but I have tons of o-rings laying around the shop. If you replace them and just buy plain old o-rings get viton, it handles heat better.

EWC88 · Sep 8, 2016

Yea I have no o-rings so I'd have to buy if replacing is needed, which I don't mind spending. So far I did 6 plugs and all the cool packs looked like that or looked like that ( o-ring) and the shaft? Had more black crap on it.

Where can you get Viton o-rings? If I replace them should I put any lube on the o-rings?

JAMMAN · Sep 8, 2016

I did a quick search and looks like you can get OEM's all over the internet for like 3 or 4 bucks a piece. I wouldn't replace them for that much LOL.

I didn't see a cross reference for the "dash" number for the o-ring so I don't know what to tell you on size but I get my viton rings from McMaster-carr or Zatkoff.

I put lube on mine, don't know if it is the right thing to do or not but they sure do slide in easier.

EWC88 · Sep 9, 2016

I googled Viton O-rings and apparently harbor freight carries them in a variety pack for $10 so might just get that today after work. I know with some o-rings you have to watch what type of lube you use on them because through time it can make the swell, maybe just put that dielectric grease you mention on that and the boot?

Spark plug gap and torque?

Senior Member

Banned

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Similar threads

Forum statistics

Share this page