What thread is a knock sensor?
 

Got a new Dart gen 6 block and its not drilled for the knock sensor,anybody know what size thread it is?

I'm guessing it 1/4 npt?

Thanks

Yes, it fits in the water drain hole in the side of the block.

I noticed it did screw in,just want to make sure before I go to drilling on a new block

Rob

are you saying it goes in the water drain hole,i dont think so.

Some people put them there, I wouldn't, I just said it would screw in and it's the same size. Could make a bushing for the hole that is used for a clutch set up in a car.

on every ski boat with efi that I have worked on the knock sensor was screwed into the drain hole on the side of the block. they all came that way from the engine builders.

We put them in the drain holes on just about every engine we do. Nothing wrong with putting them there.
Eddie

Thanks for the replies

I really dont want to put it in the drain,Every time I rebuild the engine I remove the knock sensor and the built in nut spins and rounds off, have to use channel locks it remove,maybe im screwing it in to tight,but I assume its bad after it spins.

There is 2 blank boss's on the side of the block I could drill and tap,also the clutch pilot hole I could inlarge and install it there.

Rob

fixx
 

their should be a 1/2''or 9/16'' hex on the under side of the knock sensor,,thats where i tighten from..ya its a stupid place for it,,then they get all rusty and throw a service code..

I dont recall one under the head,I allways got it from Merc, maybe a non merc is diff? Ill look again

Rob