How to Troubleshoot & Replace Whirlpool AP4098508 / 74007736 Surface Burner Head

We replaced the entire burner as the small metal igniter holder on the bottom of the burner was rusted, disintegrating and impossible to remove. This fix would have been easier if the screws holding on the burner were not rusted and subsequently broke. All the WD40 in the world would not remove a rusted, broken screw. Lucky one removed without breaking and replaced with a stainless screw as should have been in the first place. If they were stainless at manufacture they would have not rusted/broke and this repair would be a breeze. But if the screws were stainless this repair would have not been needed. Use WD40 before attempting this repair. Replace screws with stainless. 

Changed the burner Again, super fast service/shipping. Thank You 

APP provided the part, but too small. Called and they had the correct size in stock. Sent the wrong one back, received the new one, it works! Received the refund less the shipping a few days later. I will use APP again when the need arises. 

The right tools, a ratchet and the correct star shaped bit. Removed old burner, gentle pull to detach old ignitor, cleaned surface, attach new ignitor, seat burner and fasten the 2 screws, which are sold separately. 

New burner assembly! It was so easy and I'm sure it saved me a couple hundred! 

Purchased a replacement part 

The new burner fixed it. All I really needed was the ignition piece (that's included and, I believe, not sold separately) but having a shiny new burner assembly to replace the old rusty one is a bonus. Wish it came with the 2 screws, as my old ones were/are a bit rusty and I was too lazy to drive to the hardware store for new ones. 

Replace burner. 

Purchased-arrived next day 

Replaced all burners