Heya Guys,

Can someone please tell me if these marks are wear or are they ment to there? They are located as follows:
Cylinder 1 - 12 o'clock (being toward the front of the block)
Cylinder 2 - 6 o'clock
Cylinder 3 - 12 o'clock
Cylinder 4 - 6 o'clock.

They look like wear to me. If it is wear, any idea how they got there?


Cheers guys.

Clay

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  Bore mark.jpg (96.84 KB)


  Bore mark 1.jpg (123.64 KB)


  Old piston.jpg (120.15 KB)

how do you upload pictures?
can you please let me know.
pm me or something.
cheers

Those are there from factory. Not wear. Normal.

I think you are refering to the standard machined grooves at the tops of the bores.
I believe they are to help with valve shrouding (for better flow out the valves) A lot of engine builders do this with an die grinder when larger valves are fitted. As long as its only done as far down as the top ring sits at TDC all`s good.

Hi Guys

Sorry if i disturb this topic , what this no in the piston means (that i have highlighted in red on the top of the piston) ?

thanks
Regards
sumith

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  piston.jpg (57.81 KB)

I did check to make sure the rings didn't touch them.

Thanks heaps for that guys. Appreciate it heaps.

Clay

Sumith,

quite often when an engine is rebuilt the mechanic will number the parts so they know where they came from.

hi ssskiwi

means that particular piston is belonging to which cylinder etc ?

thanks
Regards
sumith

Yes, it may have been pulled down to only re-ring it if the bore and pistons were OK. The pistons, rods and caps will all have been stamped with the cylinder number etc..