Blew A SPARK PLUG

I still can't get this motor running 1990 E3BRESR 3hp, pull carb it's clean as a whiste, so to check the spark I put 3 cc of gas in each plug hole and pulled the rope, bam went the upper plug about 8 feet now the plug threads won't tighten> what's my answer?? at least I know I have spark in one cylinder. is it possible to tap the threads which I don't have a tap. HELP [-X

Heli-Coil is the answer, they work well

https://www.helicoil.com.sg/

w3hat's a heli coil

have you checked the timing?

no ..... no idea how to do that ??? ha ;ha must have had a senior moment

[url=https://www.tinboats.net/forum/viewtopic.php?p=345843#p345843 said:

earl60446 » Today, 09:50[/url]"]Heli-Coil is the answer, they work well

https://www.helicoil.com.sg/

Click to expand...

Helicoils have a reputation for backing out when you remove the plug or bolt that they are securing. I've heard about it from several people and seen it happen first hand to some things I've worked on before. IMO https://www.timesert.com/ is a much better option with a positive locking method to ensure the threaded insert does not come out when you remove the spark plug. It's also made of a solid piece of metal instead of being a coiled up piece of metal like a spring. Another advantage of the Time-Sert is that you can get them in a variety of different materials like aluminum, steel, titanium, etc.

Rent a tap and re-tap it

it's a very tight space to get a tap into, the thread is not normal sae

[url=https://www.tinboats.net/forum/viewtopic.php?p=345892#p345892 said:

rocket rich » Sat Mar 22, 2014 6:38 pm[/url]"]it's a very tight space to get a tap into, the thread is not normal sae

Click to expand...

Anywhere you fit a spark plug you should be able to fit the tap - (well almost and I feel your pain)

What do you mean the thread is not normal - do you use a strange (unusual) spark plug? The thread has to fit the plug and most use a standard thread


Anyway, you can chase the threads with a tap - but if they are stripped then you will need something else - like a helicoil or insert

Here is a good link

https://www.popularmechanics.com/cars/how-to/repair/4212608

Go to NAPA and buy a "Sav-A-Thread" kit. You will need the inserts for the 14MM threads. They will come in various lengths.
This kit is the simplest kit available on the market to repair threads for spark plugs and comes with everything needed in the kit.
I have done many many repairs using this tool without a single failure afterward. Simple and easy.
Here is a YouTube video of one of these kits being used to repair a Toro Lawn mower.
Skip the first couple minutes of it.

https://www.youtube.com/watch?v=A78Ve-cHYyo

You put way too much fuel in the engine and you were very lucky to have gotten out without injury on this one.
This is not the way to check spark. Will let someone else tell you the safer ways to do it.

May have cracked a ring or killed the motor . Never heard of any one checking spark that way before. Always seen it done on small motors with the fuel cutoff, plugs removed and grounded on the cylinder head, you or even a buddy pull the rope and look for spark if you have good spark then you will defiantly see it. The method you used was dangerous. If it had enough force to blow a tightened plug out then it probably cracked the piston ring too. Best scenario you re tap and the motor is fine. Make sure when you re tap not to get even one shaving in the cylinder if you do then it will KILL the motor. To do this you will most likely want to remove the head and buy a new gasket and be sure to re tighten/torque to factory specs. Compression check after wouldn't be a bad idea either. Well the motor has spark, that means there probably was a fuel issue. Either to much or not enough/none. If the plug was wet before and not firing then there was to much fuel ( probably a bad carb float ) if not maybe a bad fuel pump clogged filter etc... Like Pappy said luckily you or someone else wasn't injured.

Keep thinking you're saying blue spark plug every time I see the tittle of this thread! *Blew. Lol

you are right I blew ,a senior moment

SOLD THE MOTOR =P~ :lol:

Hey I've had this happen....not mine, a customer's.

Actually it was a lawn mower. Customer shows up, says his engine's spark plug is loose (keep in mind he was not mechanically inclined whatsoever). So I walk out to have a look-see. Right side cylinder on a Kawasaki FD501V liquid cooled engine (a SWEET little motor, BTW). I couldn't reach the key switch and watch the plug. Guy says he'll turn the key. It turned about 2 revolutions-maybe-and made a big bang. Next thing I know I'm bleeding out of my arm and it hurt like I've never felt before, engine tried to fire that cylinder, shot the plug out of the head and left it in my arm. Got 6 stitches at the doctor. Luckily it didn't hit anywhere else, say, more important. I also did the same thing years ago on a jet ski, but I wasn't standing over it or anywhere near it...engine fired up but the rear cylinder popped pretty loud and shot the plug into the ceiling insulation...a 14 foot ceiling. Plug and part of the plug wire. There's a lot of force going on in there and if things aren't quite right, they can get dangerous.