It has got to be tapered to get in a fresh hole. Then you can finish it up with a square one to tap out the bottom of the hole.
It has got to be tapered to get in a fresh hole. Then you can finish it up with a square one to tap out the bottom of the hole.
acquire correct tap from hardware or automotive supplier. Drill smaller hole through EGR port boss on head. Drill larger hole , size stated on tap to same depth as on intake port. then tap. If metric thread tap cannot be acquired a tapered pipe thread tap will also work. Threads are very close and will seal because of taper.
In general a female thread is cut with a tap. A male thread is cut with a die.
Cutting a thread on a shaft
tap root
tap root
National Pipe Tap, the angled self sealing thread of a pipe fitting
A thread chaser is used to clean and restore damaged or dirty threads vs. a tap or, die which cuts threads.
A tap is a tool, a tap can cut or clean the threads of a bolt hole, there are differant diameters and thread pitch, a dye is the opposite of a tap it cuts or cleans the threads of a bolt.
Tap water is only slightly acidic
STI stands for "Screw Thread Insert." When tapping a thread with an STI tap, you're typically preparing the hole to receive a threaded insert, commonly known as a helicoil or thread insert, which helps reinforce or repair damaged threads. My Recommendation 𝐡𝐭𝐭𝐩𝐬://𝐰𝐰𝐰.𝐝𝐢𝐠𝐢𝐬𝐭𝐨𝐫𝐞𝟐𝟒.𝐜𝐨𝐦/
Get a TAP the size of the CO opening