Starting isssues and spark knock Q's

blackturbo1 · 05-27-2008, 02:47 PM

OK, my next two cents goes toward a cam follower knock, that is, the knock sounds to me like it's coming from the head, not the block. Although it's not easy to diagnose from a video and because I don't know exactly what yours sounds like, I can't say %100 that this is the cause but if I were to bet, I would say it definately sounds like something in the head.
Since Supra cam followers are solid type and not hydraulic, only two possibilities arise, either there is too much clearence between the cam lobe and the follower or you may have a valve that is slightly sticking. If the valve is sticking you could try some marvel mystery oil. If clearance is the issue, you've either got a worn cam lobe or follower shim or a combination of two.

Of course, I could be totally wrong and you might have a bad piston pin.
In that case, time for a new motor.

05-27-2008, 02:47 PM	#15
blackturbo1 Stock Join Date: Jan 2008 Location: New Orleans, La Posts: 6	you-tube engine knock OK, my next two cents goes toward a cam follower knock, that is, the knock sounds to me like it's coming from the head, not the block. Although it's not easy to diagnose from a video and because I don't know exactly what yours sounds like, I can't say %100 that this is the cause but if I were to bet, I would say it definately sounds like something in the head. Since Supra cam followers are solid type and not hydraulic, only two possibilities arise, either there is too much clearence between the cam lobe and the follower or you may have a valve that is slightly sticking. If the valve is sticking you could try some marvel mystery oil. If clearance is the issue, you've either got a worn cam lobe or follower shim or a combination of two. Of course, I could be totally wrong and you might have a bad piston pin. In that case, time for a new motor.