HOW-TO Easily Fix Stripped SPARK PLUG Hole Threads
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- เผยแพร่เมื่อ 20 พ.ย. 2019
- HOW-TO Easily Fix Stripped SPARK PLUG Hole Threads
In this video I show you how to easily and quickly fix stripped cylinder head spark plug threads!
This method will apply to all small engines and even in the automotive industry!
Tool used in video is called a "Spark Plug Thread Chaser".
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Easy to follow and thorough step by step tutorials do it yourself (DIY) to help you with your broken lawn and garden equipment including snowblowers.
I do my best to teach you how to easily diagnose problems the fastest, quickest and most efficient way with real repairs beyond just replacing a spark plug. These tips are for both the homeowner and shop owner.
Whether it be a handheld, two stroke, two cycle engine like chainsaws, weed eaters, string trimmers, grass trimmers, line trimmers, hedge trimmers, strimmers, brush cutters, leaf blowers, or four stroke, four cycle units like lawn mowers, lawn tractors, snowblowers, pressure washers, generators, ride on mowers that need parts installed or replaced, I’m your go-to guy.
My favorite brands of spark plugs are NGK and Champion and are the ones I recommend.
I’ve been a small engine mechanic for many decades and also run my own repair shop so my videos are loaded with tips and tricks that I have learned and want to share with you. You will also find many tool and product reviews from top brands on my channel as well.
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Due to factors beyond the control of DONYBOY73 “The Small Engine Doctor”, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. DONYBOY73 “The Small Engine Doctor” assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. DONYBOY73 “The Small Engine Doctor” recommends safe practices when working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of DONYBOY73 “The Small Engine Doctor”, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not DONYBOY73 “The Small Engine Doctor".
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ALWAYS THREAD IN SPARK PLUGS BY HAND FIRST THEN TIGHTEN WITH WRENCH!
Thanks for the grease tip!
My won’t go in without using a wrench
@@randi740 what kind of grease
@@freedompioneer4311 Any kind should work.
@@landen_576 It is probably stripped if that is the case.
This video was a life saver! Been maintaining Harle's and yard equipment for some time and I accidentally stripped the plug for my Ariens Deluxe 28 snow blower. Followed your tutorial and it worked like a charm. I have liked and subscribed...thank you!!!
I’ll put a piece of fuel line on the end of the plug to start it in, if it’s hard to reach in with my fingers. Thread chaser is a great tool.
Jim add a short piece of tight fitting wooden dowel to the other end of the fuel line to act as a handle and then see all of the places you can reach with it. Also great for handling hot plugs.
Ditto!
👍👍👍
@@37yearsofanythingisenough39excellent tip, will do. Sometimes the simplest things elude us.
jim s That’s what my wife claims happens to me!
I have a tip for you... I had an old time Master Mechanic tell me when I was a young lad.. I'm 56 years old now..
When he installs spark plugs, he would take a rubber hose approximately 6 to 8 in long and install it on the top of the spark plug and then he will hand start the spark plug using that rubber hose twisting the hose with his hand, until the plug is screwed in the hole appx 1/2 way... then he would put the spark plug wrench on there and snug it up.. With my fat little sausage fingers, I've used that trick for 40 years it has served me well.......👍
Bish Bash same here sir NEVER go wrong:)
I've been using a 12" piece of rubber air line for decades to install spark plugs. It slides completely over the plug insulator and keeps the plug from falling out. The hose is long enough to reach down into engines that have spark plug "tubes' that sit in a line down the center of a cylinder head / valve cover. Also great for going around corners, brackets, wiring and other engine hoses that are in the way of a spark plug hole, or the holes are just at an inconvenient angle and hard to get to. Never once needed a 'handle' in the end of the hose since the grip on rubber is much more secure than a smooth piece of wood.
@@highpwr That's a good tip also...
Ya, I never used wood either.. I always had better control with just using the rubber hose. I like your idea with the airline, I think I'm going to try that next time. Thank you..👍
Well this is from a 71yr old Class A mechanic we use the old long spark plug boots from old spk plg cables they are pliable and don't have a set in them like hose. If you have to use hose use hose without cord. Also Don seems to be a lot of carbon on the threads of the cyl head was plug loose org
@@JFLovely17 another excellent idea from a master mechanics of 71 year young thank you for your reply excellent idea....
I switched to using fuel line to start my plugs on hard to reach plugs. Getting in a rush to finish a job is usually what gets us in trouble. I am not going to lie and say I have never done it. I have had to replace the cylinder head on a snowmobile because eather the plug was seized in the threads or I screwed it up myself. My fingers no longer work properly any more, I have noticed that as I get older, I have had to change how I do things. Investing in a power wratchet and impact drill have really saved me. Thank you for showing us that tip. I learned it on the head of a 1987 Escort Wagon that had blown its spark plug out of the threads. Some one had over tightened and stripped the plug threads on it before I got it. I suspect it was the dealer for you.
Thanks for another informative and entertaining video Don! I have done this myself and found that if I magnetize my thread tool, it helps capture the metal shavings as well.
What a great save, gonna have to look for one of those. Even though I'm only working on my own stuff I can see how it would save me a lot of frustration.
Great video, I usually start with a piece of hose if I can't start it with my fingers. Great advice Donyboy!
Great video Don. I have the same issue on a Honda GCV135 engine. I didn't realise that tool existed to chase the threads. Will be buying one now once I find out the thread size. Cheers!
I always put spark plugs in by hand and turn them in as far as possible on any engine small or large.
Learned that one the hard way.
Thank you Sir you are appreciated very much for excellent videos over the years.
Once again great video and tips. Gonna have to try to get one of those tools. Thanks for the video.
Great tip. Thank you for sharing. 😎🇨🇦
Thank you!!! I did eactly as you said and back in action after having buggered up first 3 threads or so using a socket (no hand) to try get the plug back on! Stupid move on my part to begin with but this got me out of trouble!
Glad I watched this may prove a handy fix
lovely Video there Donny mate this idea sounds like it will work on lawn mowers too and here in Australia we have a Victa Power Torque 2 stroke lawn mowers with the Decompressors and Engine Crankcase Pull Starter assemblies and we often get people,s mowers who over tighten or strip or cross thread the original threads from the cylinder heads on some people,s accidents or nerve etc but yeah very common here
This worked great. Thank you.
Well done again. Enjoy your channel 👍.
Thanks Don!!Fix my spark plug thread on my old ariens st 1236 :)
Bro. Thank you. Great video
Yes, I'm one of those idiots who cross-threaded the spark plug on my leaf vacuum. This tip worked perfectly - thanks.
Greetings from Spain . I love your channel. You make very useful and instructive videos. I've learnt a lot ! Thank you so much.
greetings from Canada
Greetings from Slovenia 🇸🇮
Thank you for this video!!
Great job, I have a plug chaser that expands,you put grease on it,drop it in Hole to bottom of threads,expand it and back it out.
Pulls all the shavings out with it and starts at good treads and makes a great repair.
I enjoy your stuff.
I’ve seen one of these but I have a couple of questions, does it bore it out so u need a bigger spark plug or can I use the same one, also what if some threads are good, does it leave those alone or would it change those threads as well
I ran into this problem today at the shop on a Predator engine. The threads in the head only have about 2 rounds still in tact, the others are smooth. I have a Heli-coil but I might try a thread chaser first. Thanks.
Great job on that job spark plug repair my canadian brother 👍😎😎👍
Good video! Thanks
Great job
Great tip with the grease
Rubber hose on end of porcelain and its the feel , NEVER messed one up 50 yrs
Thanks for the info and advice.
Any time!
Well I've just ordered a two pack with four sizes after watching this video. Cheers mate 👍
THANK YOU!!!
I'm 67 and have never stripped a plug in my life, but Saturday when I was pulling the plug from my John Deere mower I noticed the plug was really hard to take out and I don't recall it being hard to put in. I knew it was going to be a problem and it looks like this could fix it.
I have done many of these repairs already this year
I bought mine to use as a motorcycle flywheel remover. I use the 18mm side on aircraft sparkplug holes occasionally.
Thanks Don
Great video Where did you buy that tap tool ? Will it work for 5/8 spark plug auto plugs
Thank you.
Exellent , get to the point video .thank you Donyboy 73..
Where can buy that tool?
Do you have a video on replacing the spark plug wire/boot on the craftsman 28 inch wide snowblower? Or something else similar
I like to take a short piece of plastic tubing and put one end over the top of the spark plug, and roll the tubing in my fingers as I thread the plug on. This helps especially in tight spots
NICE trick
Do you recommend a little anti seize grease on plug threads? Thanks for the tip.
Very informative 👍 Anyway the spark plug thread of my motorcycle are lose thread.The standard spark plug is C7HSA and i am decided to make it OVERSIZED.The OVERSIZED spark plug is DH6A what size of hand tap do i have to use?
Another great tip Don, I need to find one of those thin walled socket tools.
Another brilliant design from the engineers at Briggs and stratton...spark plugs that can't be reached with a normal spark plug socket.
Crazy question, but what kind of grease did you use? Have the same issue with my snow blower and want to give this a shot.
Put anti-seize on spark plug threads helps.
I replaced a new spark plug on my snowblower, it ran for about 5 minutes and heard a popping sound, the spark plug shooting out from the engine , I thought it had damaged the threads, (looked in the spark plug hole, it doesn’t look damaged )I put the old one back in, it’s nice and snug, it ran fine..new spark plug looks defective (maybe smaller and loose)when comparing to the old one...I was lucky didn’t have to do this procedure...but thanks for sharing.
A small amount of nickel anti-seize on the plug helps save engine threads. Reduce the torque by 30% when tightening.
Do you use flex seal products on any of your repairs
Can you use a rubber hose to start it in the engine? My Honda is hard to access it
I bought that plug thread chaser in 1965. Some of the best money you can spend on tools.
MUST be a much better quality tool then what I can find today
@@donyboy73 Mine was made by KD Tools, and is a silver finish.
@@Cope1024 where you get it?
@@DavidHernandez-ue4fz At my locsal auto parts. KD is out of business, so look on the web.
@@Cope1024 i will tried to fix on mower,any suggestions?
I usually like to use a shop vac to try and get out any small pieces that may have dropped down inside,I have a small hose that goes on my shop vac
thanks Don, great video tips. do you ever use anti seize on the threads of the new plug or in other equipment ? thanks
only my vehicle
Nickel anti-seize, used sparingly, is appropriate on any spark plug thread. Remember to decrease tightening torque by 30%.
where did you get that tool? that is neat!
All well and good. if you are without a thin wall plug tool or a thread chaser now what? What, use your old plug and a triangle file cut four grooves up the threads tapering them deeper at the bottom to the top, making your own tap Start the plug in the hole with your fingers and yes a piece of hose fitted on the top of the plug for an extension works great now with grease on the plug gently start the plug and run it in all the way down, back it out clean it and carefully reinstall the same plug. When you can replace the plug with a new one. This is how I repaired a crossed threaded Honda number 3 plug on a 350 four which has a frame tube in the way for a good straight shot at installing the spark plug. This worked for me and it lasted from the California desert to Missouri where it had the plug replaced by the dealer.
Hi. The cover that you removed with the gas pump. One of the two screw holding the cover with a plastic wing nut has stripped at the know itself. the screw remaining is now a seized pin. i have sprayed wd40 and used an adjustable snap pliers but it will not move. any ideas?thanks. BTW great videos
Think intermediate level to entry level could do this donyboy73? I am worried 😟
That could have been so much worse for the customer, they need to be more carefull.
I've always used fingertips for starting plugs, most of the time the plug goes half way in before needing a socket.
Where do you get the spark plug thread chasers
You can adjust the piston so that it is at the top of the head and with needle nose plyers stuff a little tissue in the spark plug hole for double protection to catch metal shavings.
What kind of grease did you use?
Great video Don ! Canadian Tire in Canada also sells an OEM brand expandable thread chaser. You just insert it passed the bottom thread, expand it until it mates the head threads and back it out. Great because the bottom threads are usually in good shape and grab the tool easely and because you pull out the shavings. Keep up the good work !
i'll check it out , merci
@@donyboy73 OOOOPS, mislead you Dony. The tool is Powerbuilt # 640811
Put anti-seize on the threads, screw the plug by hand until the gasket is seated, and finish with a plug wrench with short handle to feel the torque. Anti-seize enable the plug to be screwed by hand until it is seated.
Hi Dony, doing the same thing to a generator! :)
Same thing here
I cut grooves in a spark plug then use it to chase the threads
@Vintage & Modern Repair
Never thought of that.
Good to know.
Indeed it works great using bolts cleaning or even cutting threads in soft metal castings such as aluminum and zinc where a regular tap wouldn't do.
I have done that works ok but a dab of anti seize would have gone a long way towards preventing this problem.
@therockkkkher, that won't work for cutting but cleaning it probably will if the bolt is grade 12.
@therockkkkher, the head can be aluminum alloy while the bock can be cast iron, yes, but there are many combinations now.
As for the threads being directly into the casting itself, on small engines, definitely. On modern high performance lightweight car engines, good question, I don't know - I've been driving diesels for 30 years now ;-)
2:16 My 1970 Peugeot 504 had a spark plug wrench almost exactly like that - because the plugs were in deep wells, which was unusual for pushrod engines at the time. I think I still have it. It's the only part of that car that survived to this day haha!
On my Honda mower engine, it is a little difficult to get your hand in there properly to take care with starting the spark plug. So I can imagine that some people would just get impatient and wind up cross-threading the thing.
I had a 504...I LOVED that thing..it rode like it was on a cloud and had an awesome sunroof.... and best was nobody had a clue what it was...
@@alcocklake Yeah! I liked mine too and even rebuilt the engine once. It was awesome for driving on bumpy 2-lane secondary highways at high speeds, like 80+ or whatever mph, because of the great suspension with no bump-steer and lots of wheel travel. And the piston/cylinder liner kits with slip fit liners. And that full manual sunroof - I appreciate that more than ever now that I've had a BMW which has a sunroof that fails, you "fix" it, and it fails again. Boo.
Can u use this on a honda oddyseey engine? On of the spark plug holes is stripped
Dony You didn't say where I can purchase one of those spark plug threading tools ? thanks Ron
check Amazon
Did you change oversized sparkplugs?
does anyone know if different plugs have different thread pitch on them? Thanks
some do
Hi sir not sure if you have time to reply. I have same machine and did same fix. Seems to work. Issue is when blowing snow it keeps shutting down ? I can’t see the plug fix having anything to do with this?? What’s your thoughts
Thanks
could be a fuel issue
donyboy73 fresh fuel sir that day at gas station..???
Donyboy I need to chat with you something badly about swapping crankshafts on a 25 hp Kohler engine how is the easiest way to get ahold of you to chat?
I have a lawn tractor with a single cylinder engine and it popped out. I wonder how much damage there may be in there. It sounded like a backfire when it popped out and now it won't thread back in. I had never seen anything like it happen before. The plug still had the wire attached but I found it dangling on the wire and immediately knew I may be in for some trouble. Maybe I can still get some life out of that engine? I should probably let the shop I bought it from take a look, they are an independent shop and never overcharged for anything I had it in there for in the past. I can get them to look at and make an estimate of the repair cost. I don't know if anything else in there is bad, a borescope would be nice to get a quick peek in there and see if it looks OK in the cylinder. I think that all it may need is a thread repair but I won't know until I or a shop get a deeper look inside it. It was not cross threaded, it has been working for a good long while with no issues. I go to start it up and bang! Then it cranks a lot easier because there is nothing holding pressure any more. I don't know if it needed a valve adjustment that may have been to prevent this. I don't even know if the previous owner had them adjusted. Many people never think of things like that. I hope it is not shot. Maybe it happened because the timing was off a bit? I don't know! It will be interesting to hear what may have caused it. It is bizarre!
Search for Powerbuilt Back Tap 640811. It’s a spark plug thread tap that lets you tap the threads from the inside out without removing the head.
Where to buy this?
Where do you purchase this tool from?
Every time I change a spark plug or something subject to heat or threading into Aluminum I use some Anti seize compound on the threads. Cheap insurance for when you take it out the next time.
Can you use anti seize as grease?
NO you shouldn't
Also, these soft aluminum threads WILL strip if the spark plug is undone on a hot engine. The engine must be left to cool completely before removing the plug.
What's the part number of the tool you use?
How do you repair a spark plug thread in a generator with a Tap and Dye set?????
what if you accidentally over torque the spark plug in the hole and the hole it too big for the threads?
It does make me wonder why manufacturers don't fit steel bushes in the first place but that would spoil our "enjoyment" later on!
turn it over a little to push out any grease
I was advised by a shop of "experts" to use anti size on the plug. I explained that there isn't a need because it's always dry and comes out every few months. What's your view? Great little tool for the clumsy fingers brigade.
not necessary if it comes out often like you say and is stored indoors. I do however put a slight bit on my vehicle spark plugs
Just remember antiseize can make it easier to over torque, and make sure when you apply it to wipe off excess so that it stays in the thread valleys.
Put antisieze on every thread that is subject to heating and cooling (due to condensation) and every thread subject to water, salt spray, and etc. unless you enjoy thread repair. I have seen too many spark plugs, muffler bolts, wheel lugs (cars, trucks, boat trailers) rusted in place when the need arrives to remove them. Some engineers will tell you that it affects the torque value, but remember they don’t really work on anything. I’ve never had anything in 67 years come apart yet due to antisieze. YOU DO NOT NEED TO PAINT THE ENTIRE STUD OR BOLT WITH IT. Put some at the beginning of the thread and the mating female thread will carry it down. Antisieze is REQUIRED on all stainless fasteners that will be taken apart and reassembled to prevent gauling and the resulting lockup. Don’t bother looking up gauling in Machinery Handbook......there is nothing in there about the subject. I believe it happens because of most alloys of stainless being relatively soft........but I am not an engineer.
@@37yearsofanythingisenough39 Yes, exactly. I use it in my car, snowblower and mower it is a good idea. I use it on bolts, wheel lugs, and other spots since I live in the "rusty northeast" portion of the US.
Be aware that anti-sieze conducts electricity. If you get any on the ceramic it can cause the plug wire to short the the cylinder head.
Another thing I learned the hard way.....
I apply anti seize compound onto the spark plug threads, I was a bit worried when I was changing the spark plugs in my mothers Corolla as one of them was a bit tight.
I was afraid that the aluminium threads would gall up & strip out so I used an anti seize compound on the new spark plug threads so the same thing wouldn't happen next time !
Mr. Miyagi say; "Best'a defense is no be there."
Leave the spark plug in the socket and extension, and install with your hand. Why does it have to be so difficult? I have never cross-threaded stuff.
NO ANTI-SEIZE?
Use grease. Smarter than Scott Kilmer
Also, never pull or install plugs on a hot aluminum cylinder head. Always let it completely cool first.
What engine is that?
briggs 13:50
@@donyboy73 Thanks
Hi can this be done to chainsaws
yes
Should you always try this first? I have a stripped outboard motor spark plug. The spark plug will go in, but the spark plug remains loose
yes I always try this first and if it doesn't work I install a thread insert
You know it still have metal shavings in the cylinder ? With the grease not good enough. You still have to blow out the Metal shavings from the cylinder head .
It's a minor point, but the title is a bit misleading, the threads aren't actually stripped, just misaligned.
Where can I get that tool? What is it called? Thanks in advance 👍
check amazon, "spark plug thread chaser"