<VV> The latest on the metallic rapping noise from my recently built 3.1

[Tony Underwood]

At 04:43 PM 5/3/2014, Bob Gilbert 1 via VirtualVairs wrote:
>Here is the latest.
>
>
>
>I took both heads off and there is no visible damage or unusual marks on the
>heads, on the top of the pistons or the cylinder walls from TDC to BDC
>
>At this time all of the cylinders and pistons are still in place.




Just for sake of mention...

You might wanna check the edges of the piston crowns to make sure 
they're not "bumping" anything at TDC.  I've seen some engines make 
this noise when nothing else seemed wrong, to find that the edges of 
the piston crowns were tapping the edges of a "knurled over" head 
gasket that, when torqued tight, was spreading enough to get in the 
way of a piston which was actually extending farther up the jug when 
the heads were torqued than it was observed to be doing with the 
heads off the engine.  Another I saw which was very obvious once the 
head came off was a piston or two with the edges of the crown 
actually scarred from hitting head material that had extruded out 
from under the head gasket from being torqued down excessively and 
evidently from also possibly having been overheated... although in a 
rebuild I'd not expect to see anything like that.

Still, look close to see if there's evidence of the piston crown 
edges contacting the head gasket etc.

Probably not the case but it's worth a look.


tony..