An interesting video below on For spark plug thread repairs. Not that I agree with everything he says but interesting never-the less. There are a few misconceptions that I’ll point out that anyone doing this job should know!
The video we’re talking about is below. As far as what the guy in the video says about the parts store kits I completely agree with. Some little kits have large hex tops that make it almost impossible to use down in the spark plug well. All of them have cheap, thin inserts that typically cannot handle heat and compression and ultimately fail.
These cheap inserts are usually held in from the top by whacking them with a swedge tool and hammer. No No No!
The guy in the video says he likes that style? Really have no idea why. The black inserts are also fully threaded which will cause a problem if using a Ford spark plug that is only partially threaded. Also the black insert relies on the original taper seat in the head which could be damaged during all the striking with a hammer. He goes on to correctly say that the Calvan 38900 inserts are far better which I agree.
When plugs blowout using a tap is absolutely worthless! The guy in the video says if you don’t know why you’re plug blew out, you could try a tap. I can tell you if your plug blew out it’s because the aluminum threads are deteriorated! Using a tap or thread chaser will clean the threads up but the problem is that there’s not enough material there to begin with. No No No!
The guy in the video says he would go with an ATD-5400 over the Calvan 38900 if he had to do over. His misconception is that they are made by different companies. They are in fact made by the same company -Horizon Tools. He had a problem with the reamer. The reamers are actually the same in the ATD 5400 and the Calvan 38900. The fact that both kits have the exact same instructional video and all the same parts should have been a tip off! The kit he says has 8 inserts which matches “these engines”. He says Time Sert only has five and what’s the point of that? Actually Wise Auto Tools has the Calvan kits with 1-10 inserts that allows the buyer to choose how many inserts they want. Some guys have a 6.8 Liter V-10 and prefer to do all 10 cylinders. Of course the price goes up according depending on how many inserts are in the kit. Lowest price starts around 179 with one insert – Calvan 38900-1.
It should also be mentioned that the Time Sert 5553 kit is available with 5 or 8 inserts. The Time Sert also works on many more engines than the Calvan 38900 which has a very limited application.
I agree that the Calvan 389-4000 should be included in the 3V Kit. The Calvan 39300 or ATD 5410 for 3 Valve engines does not have the valve for checking to see if the engine valves are closed. It should. Agreed. The valve stopper – 389-4000 can be purchased separately though at WiseAutoTools.com.
The stop point is at the upper line. He mentions that the tap can’t fall in. No no no. It CAN. If you thread too far it can definitely fall inside the cylinder. I’ve had a couple of customers over the years that have had this happen. That’s why it is good to use something like the E-clip to prevent going too far or the tap falling into the cylinder.
Loctite or JB Weld works fine.We’ve had customers over the years use both. No problem with either. The manufacturer does however recommend JB Weld. we have both available for purchase. The JB Weld is less expensive but the choice is yours. You can’t go wrong either way. It is mainly to prevent the insert from unscrewing with the spark plug on the next plug change.
Yep. The machining is nice on the 389-100. Love the fact that the taper seat is right in the insert instead of the cylinder head. To be completely transparent, the quality of the Calvan 389-100 inserts suffered a few years back. We ran into a batch of these that the spark plug would not thread into. Another batch rusted in the case while sitting on the shelf. For these reasons we are constantly checking the quality of these inserts to ensure that our customers are not disappointed! We also email extra tips on how to do the job that we’ve compiled over the years. We don’t sell on eBay or Amazon because we have much more control on quality and can provide better faster shipping options. Remember there’s a lot of stuff on the web, we’re here to help sift through it and find correct information when it comes to thread repair especially. That’s our specialty! Visit us at WiseAutoTools.com or call us at 800-734-8665 if we can assist in any way.