Administrators hughezee Posted March 25, 2015 Administrators Report Share Posted March 25, 2015 Not all members have replaced there spark plugs before and the J30A V6 engines can be a right pain if this service item has been overlooked for a period of time. Therefore caution is advised when removing and re-installing any spark plug as you can damage your engine block. Also using anti-seize alters the tightening torque by up to 20% which may cause over-tightening and also anti-seize can reduce electrical ground contact if the anti-seize is non-conductive or semi-conductive. Personally, use some conductive anti-seize on the new threads as this will make installing them easier as well as removing them in the future Never force the plugs out, twist them loose and tighten using penetrating oil and they will come out with ease, persistence pays off Not exactly plain sailing but I got there eventually and any questions please do ask 2 Link to comment Share on other sites More sharing options...
Founding Member Mazda Man Posted March 25, 2015 Founding Member Report Share Posted March 25, 2015 Another excellent post Stu. I remember you fitting some plugs a while ago when I came up and you said not to overtighten them and just nip them up. When fitting them too I remember you saying to let the new plug "find" the thread by gently turning the plug tool and letting the plug find it's way. I would imagine overtightening or crossing the thread is a massive nightmare to fix? 1 Link to comment Share on other sites More sharing options...
V6vtec Posted March 26, 2015 Report Share Posted March 26, 2015 I did mine last year and really easy to do, I did exactly what stu done, just take your time and don't rush it. 2 Link to comment Share on other sites More sharing options...
Moderators Laird_Scooby Posted May 19, 2015 Moderators Report Share Posted May 19, 2015 I've made a handy little tool from an old "stubby" screwdriver and a bit of 1/4" bore rubber fuel hose. Cut the hose to about 1-2" longer than the blade of the screwdriver and push it all the way up the blade - it was originally a #2 Pozidrive so the blade is about 7mm diameter and the hose grips the blade tightly. It's also the right size to grip the end of the plug on the contact which means you can use it to insert the plug and start turning it. If it is cross-threaded, the plug will stop turning and the hose will slip on the contact meaning no damaged threads. Simply loosen it until you feel the thread "drop into place" and then start tightening again. You should be able to get the plug almost fully home this way, then just use the plug wench/socket to do the final tightening. With the crush washer seating, i go to first contact of the washer (when it first goes tighter) then about 1/2 - 3/4 of a turn more tops. 3 Link to comment Share on other sites More sharing options...
Administrators hughezee Posted August 12, 2017 Author Administrators Report Share Posted August 12, 2017 Well I managed to sneak in a quick plug swap before I lost the light and I am not too sure what to make of these new Denso TT's, my hearing is very sensitive as some of you may know I'm into my audio quality and my coupes sweet smooth cold start audio track has changed dramatically I shall follow up when its back on the road performance wise and obviously the emissions test result from the MOT. So in the meantime here are a few shots of the old and new plugs, ignore the discolouration on the threads as this is what's left of the anti seize and the plugs came out simply like a hot knife through butter. One of the old NGK iridium plugs, despite appearances it's actually super clean as used spark plugs go. 1 Link to comment Share on other sites More sharing options...
Moderators Laird_Scooby Posted August 12, 2017 Moderators Report Share Posted August 12, 2017 The old ones look good Stu - reading between the lines what you heard hasn't pleased you? Link to comment Share on other sites More sharing options...
Administrators hughezee Posted August 12, 2017 Author Administrators Report Share Posted August 12, 2017 32 minutes ago, Laird_Scooby said: The old ones look good Stu - reading between the lines what you heard hasn't pleased you? In one way No and another Yes but that could just be the honey moon period, fitted plenty of the equivalent standard NGK's and few sets of Denso Iridium's and only ever noticed a full on improvement over old plugs. Like I said think it only fair to report when they have a few miles on them, although kinda think I should retrieve my old plugs out of the bin now. 1 Link to comment Share on other sites More sharing options...
Moderators Laird_Scooby Posted August 12, 2017 Moderators Report Share Posted August 12, 2017 2 minutes ago, hughezee said: think I should retrieve my old plugs out of the bin now. I'll await your few miles down the road report with baited breath! Hopefully not because you're stuck a few miles down the road with dead plugs! Link to comment Share on other sites More sharing options...
Administrators hughezee Posted August 12, 2017 Author Administrators Report Share Posted August 12, 2017 1 minute ago, Laird_Scooby said: I'll await your few miles down the road report with baited breath! Hopefully not because you're stuck a few miles down the road with dead plugs! I hope it's not like, once you go Bosch you go back 1 Link to comment Share on other sites More sharing options...
Moderators Laird_Scooby Posted August 12, 2017 Moderators Report Share Posted August 12, 2017 Not as bad as Champion where you can't get back! 1 Link to comment Share on other sites More sharing options...
Administrators hughezee Posted August 12, 2017 Author Administrators Report Share Posted August 12, 2017 1 minute ago, Laird_Scooby said: Not as bad as Champion where you can't get back! give that man the award I don't deserve it 1 Link to comment Share on other sites More sharing options...
Moderators Laird_Scooby Posted August 12, 2017 Moderators Report Share Posted August 12, 2017 Awww, thanks! 1 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted April 13, 2021 Moderators Report Share Posted April 13, 2021 I am ashamed to say I can't find any record of changing the spark plugs on the Coupe in my ownership. The service records, of my one previous owner car, are just about full and complete through the same honda dealers from when it was registered.,,,,,,trouble is they just say things like full 12 month service and although I have a stack of invoices too they don't detail a spark plug change. I bought some Denso plugs after the discussion the other day, just over 14 quid delivered so I am on with the change over later this saffy. 1 1 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted April 13, 2021 Moderators Report Share Posted April 13, 2021 Well that was entertaining ! The plugs haven't been out for a while I guess, started with a ratchet and ended up using a breaker bar !! 3/8ths though, not a scaffold pipe !! Front cover off first then out with the front plug leads, leaving the rear ones until last !! I squirted some release fluid, Ferresol, down the plugholes too, after encountering the first rock shit tight one.. ummmmm. Long extension bar for the front ones so I can get around the pipework...short one for the rear plugs as access is limited....grease for the plug threads...small amount ! The rear ones were firkin tight barstewards, the crack when they let go was something else ! The very last one nearest the brake servo is a really awkward one to get too and as I needed the leverage I removed the vac pipes from the rocker cover, The servo etc. The very last plug also decided to lose its metal washer as I took it out, you know the score ! Managed to hook it off the bottom of the hole, it was stuck to the head, and then retrieved it with a magnetic thingamajig.... Didn't look too bad but obviously not been out for a while... Beginning to leak at the ceramic / metal interface but generally burning well, NGK ones... installed the Denso and she fired first time running smoothly... Job done. 2 1 Link to comment Share on other sites More sharing options...
rich1068 Posted April 13, 2021 Report Share Posted April 13, 2021 Really looking forward to this now... 2 2 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted April 13, 2021 Moderators Report Share Posted April 13, 2021 7 minutes ago, rich1068 said: Really looking forward to this now... You will be fine, just get some squirt down those holes though !!!! and go have a cuppa !! Then on the other hand previous owner may not have been as lax as me at changing them !! 😛 2 Link to comment Share on other sites More sharing options...
Moderators Laird_Scooby Posted April 13, 2021 Moderators Report Share Posted April 13, 2021 11 minutes ago, PTR200S said: Didn't look too bad but obviously not been out for a while... Beginning to leak at the ceramic / metal interface but generally burning well, NGK ones... installed the Denso and she fired first time running smoothly... Those gaps are looking somewhat on the large side Pete! Have you measured them at all? 2 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted April 13, 2021 Moderators Report Share Posted April 13, 2021 3 minutes ago, Laird_Scooby said: Those gaps are looking somewhat on the large side Pete! Have you measured them at all? Yes, I did actually !! The old plugs are about .040 within the spec for this engine, I also checked the new ones .0375....left them at that....soon blow the ends off !! 1 1 Link to comment Share on other sites More sharing options...
Administrators hughezee Posted April 13, 2021 Author Administrators Report Share Posted April 13, 2021 Great work Pete 👍 Yes I am out with the scissors again...🖐️ 2 Link to comment Share on other sites More sharing options...
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