Old spark plugs

[Octopus]

[reply]

I believe WD40 presence in the form of liquid or vapour in the combustion chambers will cause a second explosion as they are burnt very much high temp than petrol. The sudden second explosion ( intense shock)during power stroke can be damaging to the crankshaft bearings

Just curious, does similiar things happens when using those carb spray to clean the engine while its running? I've done it a few times on my carburattor engine, seems like it actually reduce the combustion power cos engine feel like dying unless I increase the accelerator.....

[EventH]

These guys are nuts

"WD40 also said to give 2-3 mpg....."

 

http://www.gassavers.org/showthread.php?t=190

[Chucky2007]

its not exaggerting... just playing safe. why dun u try using wd40 on the plugs then let us know?

 

personally i wouldnt even use kerosene to clean anything that goes into my cAR'S combustion chamber, somemore i am not sure of wd40's chemical composition. piston repair etc are like near 200x more ex than plainly throwing away the spark plugs

[Yeobh]

So long it is clean and dry and not wet with WD40 I don't forsee any problem at all. WD40 cannot be more volatile than petrol. If it is present in the combustion chambers, it will only burnt ( cause explosion) after the atomised petrol fire up.Just remove any cylinder head and you can easily see all kinds of residue depending on type or petrol, lub used and additives add into the lub or petrol.

Soaking the plugs in a container with petrol should avoided at all cost - just one small spark or flame can ignite the fuel and the explosion can cause serious damages and injuiries.

[Octopus]

Some info from the net regarding using WD40 on spark plug, mostly its good for removing a stuck spark plug....

 

http://www.rd.com/content/extraordinaryuse...es-for-wd-40/4/ To save time replacing spark plugs, do it the NASCAR way. NASCAR mechanics spray WD-40 on stuck plugs so they can remove them quickly and easily. Perhaps that's one reason why WD-40 has been designated as NASCAR's "official multi-purpose problem-solver." [/color] Can't get your car to start on a rainy or humid day? To get your engine purring, just spray some WD-40 on the spark-plug wires before you try starting it up again. WD-40 displaces water and keeps moisture away from the plugs. http://wiki.answers.com/Q/How_do_you_chang...Protege_DX_DOHC Also, before you put the new plugs in, spray lightly with a coat of WD40. Helps keep lubricated until the next time to change. http://homepage.ntlworld.com/dotcomoff/hom...lugs/plugs.html

If the plug is tight and reluctant to move, then apply some penetrating oil (eg WD-40) into the plug hole and leave to work. Try again and if still stiff, Spray some more oil, re-tighten and loosen off again, then wait some more. This may take some time but is better than a broken plug or stripped threads. Waiting can be some time (almost 1.5 hours for me) so be patient.

 

http://www.ctracing.com/cylinder.htm

Dry the parts immediately and spray the cylinder bore with a liberal amount of WD-40, use a dry paper towel to spread the oil evenly throughout the cylinder.

Assemble the cylinder with new gaskets, do not use any type of gasket sealer. Do not put any more oil on the piston or cylinder, the WD-40 left in the bore is enough lubricant.

 

http://en.allexperts.com/q/Nissan-Repair-8...-spark-plug.htm

if you say it is striped due to it being stuck you could spray WD40 or another lubricant in the hole and let it sit a while and then remove it.http://sg.answers.yahoo.com/question/index...22200654AASVMQ4

[Megalord]

I have tried several times with diesel engines though, primary those with some unique problems. Sprayed directly into the engine intake, not through filters or pipings. Gets the job done in mins, as compared to a 2 day major job.