740 spark plug replacement

Good job. I'd have probably stripped it or broke it off before thinking about checking on line. ('cause I know *lots* about motors and stuff... I think to myself.) Don't forget the anti-seize on the new plugs.

A funny story: My neighbor bought a new model year Honda back in the '80's. He went to change the oil and couldn't get the filter off. He ended up shreading the canister all the way down to the flange so there was nothing left to grab and turn. He asked me to bring my welder over and weld something on the flange so he could turn it. After I welded a little bar on it, it spun off by hand... the heat from welding had softened the gasket. BTW... the filter he bought to replace it was the wrong one and it seems the correct filter was a new design and back ordered from Japan. He waited a week or two before he got the replacement.

It's another good reason not to use air tools to remove or replace spark plugs!

__ __ Randy & \ \/ /alerie's \__/olvos '90 245 Estate - '93 965 Estate "Shelby" & "Kate"

Another trick for the mental toolbox. Thanks! (And maybe more thanks down the road when I need to use this.)

Mike

I have had many cars with aluminium head and never had success with bosch plugs .I use anti seize because of my experience with bosch .I prefer NGK plugs because of this very reason .As this is over many cars and millions of miles it pays .Motor craft were good till they stopped making them in Japan .

ALWAYS use anti-seize when plugs go into an alloy head.

Your plug problem may have been caused by either the Bosch plugs beign just a little longer than othre brands in th threads, or they might have run just a bit cooler (or both) causing excessive carbon build up making them difficult to get out....?

I see commercials for "Denso" spark plugs. I am assuming that this is the renamed "Nippon Denso" company...? I used their ND-U plugs for years in my motorcycle and they ran great! I see the commercial for the Iridium plugs with teh U groove side electrode. Tempting, indeed!

"John Roberts>

__ __ Randy & \ \/ /alerie's \__/olvos '90 245 Estate - '93 965 Estate "Shelby" & "Kate"

There's probably cases where this is wrong, but I've never had anything great to say about any of the fancy gimmicky spark plugs. I tried Bosch Platinum plugs a couple times, in one car the electrodes wore down surprisingly fast and another ran like absolute crap under boost and took forever to track down, now I always use plain old NGK plugs and have never had any problems at all with them.

That may be the case. I know that the ND U groove made a big difference in the way the bike ran, and like you, I had very bad results in the same vehicle with the Bosch platinum. This was in a vehicle with points and standard kettering ignition (12 v system, single set of points, with two 6 v. coils).

I think the New Denso has an exposed center electrode as opposed the the "hidden" electrode on the Bosch plugs.

__ __ Randy & \ \/ /alerie's \__/olvos '90 245 Estate - '93 965 Estate "Shelby" & "Kate"

That was my experience using Bosch platinums in the 765T. Within a year there were only holes where the center electrodes were and the engine was misfiring under load. Some say other brands don't do that but I'm happy with regular NGKs.

Mike

Correction: 80 km/h - not 8 km/h of course