[cobrabro]

Hey Guys,
I am hearing a tick or more like a knock in my motor. Video below with a little factory ear candy at the end - just for watching! Sounds like it is coming from the rear of the drivers side head. It increases with rpm up to probably 1,500 - 2,000 RPM where I can't hear it anymore due it disappearing or being too fast and blending in with other engine noises. You will hear it still ticking faster than I would think it should when the motor slows down which seems a little odd to me. Also, it sometimes is silent and then sometimes loud like the video no matter if hot or cold.
I must admit that after a recent IMRC delete procedure, it did overheat on me a couple of times until I got it burped and re-filled with coolant.
Could this be the valve guide issue on Termi's due the heat?

98 Cobra Tick - YouTube

98 Cobra Tick - YouTube

[glittle75]

im gonna go with something got messed up on your IMRC delete, an the overheating probly didnt help.
The ticking from the cobras is c-head specific. not 4v in general. You have b-heads.

Sounds like valvetrain noise for sure, but i vote for valve guide after the overheating.

[termi_GT]

I would suggest pulling the cam cover off on that side and checking everything. That is not a good/normal noise from a B head 4.6.

[jansen117]

i had the same problem in my 01 cobra, i pulled the motor and it was a rod bearing, i got luck and it didn't hurt the crank or anything else.

[cobrabro]

Originally Posted by jansen117 i had the same problem in my 01 cobra, i pulled the motor and it was a rod bearing, i got luck and it didn't hurt the crank or anything else.

That's good but I don't think this is a rod bearing. (at least I hope it's not I think) It definitely sounds to be more on the top of the motor and louder on the driver side than the passenger.

[termi_GT]

Sometimes a bottom end sound will echo up to the top-end of the motor.