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Cylinder head cracks - where?
torana - January 4th, 2015 at 01:15 PM

hi guys, couldnt find this on the site.
wondering where the common cracks occur in the cylinder heads?
about to build a type 3 1600 motor and would like to check.

Thank you
:) Muz

cb john - January 4th, 2015 at 03:44 PM

The most common place for crack is between valve seats and / or between spark plug hole and one or both valve seats..

hus22l - January 4th, 2015 at 05:01 PM

As I understand it, cracks between valve seats can be tolerated but cracks between valve seat and spark plug hole are not good. Obviously no cracks is best! Good luck.
:)

dangerous - January 5th, 2015 at 08:34 AM

Don't forget to check inside of the exhaust port.
Between the seat and where the valve guide pokes into the port.

vduboy - January 6th, 2015 at 07:19 PM

Quote:
Originally posted by dangerous
Don't forget to check inside of the exhaust port.
Between the seat and where the valve guide pokes into the port.

Bloody hell they crack there too?? How many have you seen like that Dave? I went through half a dozen s/h heads for the bosses cheap K/g motor build and seen heaps of cracks as mentioned and just ended up buying new ones.. :rolleyes:

torana - January 7th, 2015 at 04:51 PM

thanks for the heads-up on where to find them guys, much appreciated :)