Engine problems.

[ozgti]

I'll take a video of it tomorrow. There's no knocking, just a tapping sound, like a valve on piston sound, but it happened with my old head and with this one.

It's more noticable when on revs, but I think it could be the 4 branch and the leaky exhausts which mask it abit!

[benough]

Can I ask if new cam followers were put into your new head?

[Preen59]

Probably not bottom end, then.

Can I ask if new cam followers were put into your new head?

Good point.. Make sure all your lifters are pumping up (and staying up) mate.

[ozgti]

??? It was a fully reco'd head, cam and valves reseated and stems replaced apparently. When I had TDC, the bucket/tappet.. Whichever it is, could be spun round by hand. Is it supposed to do that when the valve is closed?

[ozgti]

Piece of metal bouncing around in the cylinder!


Excuse the oil.

[Preen59]

??? It was a fully reco'd head, cam and valves reseated and stems replaced apparently. When I had TDC, the bucket/tappet.. Whichever it is, could be spun round by hand. Is it supposed to do that when the valve is closed?

Yes. When there is no oil pressure and no load on the valve, the bucket should move freely.. But not be sloppy in any way.


First port of call now is to file off those burrs on the squish mate. They can cause detonation.

[ozgti]

Which one is the squish? the head or piston side? (Friggin typical.. just bolted the head together.. AGAIN!)

The bucket spun freely, but the friction of the oil was stopping it from spinning round.

[Preen59]

Which one is the squish? the head or piston side? It spun, but the friction of the oil was stopping it from spinning round.

Oh, sorry..

The squish is the flat section of the combustion chamber where the charge is forced out of, or "squished" into the centre.

I was mainly talking about the head. Those small burrs will get covered with carbon. Because of their position they can't dissipate the heat. The carbon can get very hot, to the point where it acts like a glow plug. This will cause pre ignition, or "pinging".