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Crack Heads - Is it the end?
Posted: 27 Sep 2008, 17:53
by totallyconfused
Just started stripping down a second hand 1600 CT engine ready for rebuild and upgrade to 1776cc....
Took off the heads and noticed a crack in it '
'
The crack is in the top fin bit by the top bolt...See picture.
Head
http://i305.photobucket.com/albums/nn21 ... 270449.jpg
Crack
http://i305.photobucket.com/albums/nn21 ... 270452.jpg
Is it the end of the head? It needs to go to the machine shop to be worked on anyway so can it be saved - or is it just a waste of time?
Cheers - Christan.
Posted: 27 Sep 2008, 18:10
by kevtherev
not at all...
It doesn't look structural.
I had a head aluminium welded when I snapped a tap in the exhaust stud hole.
the guy spark eroded it out and rebuilt the hole up with aluminium weld
Posted: 27 Sep 2008, 18:17
by totallyconfused
Hey - thats great news!....
Now just got to get on with stripping the rest down and cleaning up all the mess!!
Cheers - Christian
Posted: 27 Sep 2008, 18:41
by Mr Bean
totallyconfused wrote:Hey - thats great news!....:DNow just got to get on with stripping the rest down and cleaning up all the mess!!Cheers - Christian
Well if nothing is leaking out of it - gas, water or oil - and it don't look fresh chances are it has been sitting there benignly for ages. I have to say that the comparitively hard circular inner seal together with the softer rubber outer seal (in the case of the water cooled unit) does induce a fulcrum effect which could cause that kind of crack without disabling the motor or causing leaks. You man could maybe weld it for you and you could check for overall distortion with a steel rule applied across the underside. I had a head cracked between the valve inserts and was told by the chap who sold the van to me that this was causing my loss of coolant. I changed the head and still had he problem. I believe a small crack is acceptable in the spec. Turns out it was a slight leak in the pressure cap which cost a fiver from G&S. Good luck anyway.
Cheers
Ken
Posted: 27 Sep 2008, 22:54
by dugcati
The crack is at the same level as the stud/nut so it shouldn't cause any problems and the head is also held in place above the crack inside the rocker chamber by the other studs/bolts.
If need be this cracks are easy to get repaired as they are not near/it's not on any critically flat/machined areas
Posted: 28 Sep 2008, 01:23
by Rozzo
ken simmonds wrote:Well if nothing is leaking out of it - gas, water or oil -
Ken
doubt if water would come out, it's Aircooled
Thanks
Posted: 28 Sep 2008, 18:48
by totallyconfused
Thanks for your comments/reassurance. I will get the machine shop to have a look and see what they say. I have no idea about leaks etc. as I bought the engine already out of the van. However, the guy I bought it off said it was running o.k. before it was taken out - so fingers crossed.
Cheers - Christian.
Posted: 29 Sep 2008, 07:42
by Mr Bean
Rozzo wrote:ken simmonds wrote:Well if nothing is leaking out of it - gas, water or oil -
Ken
doubt if water would come out, it's Aircooled
I take you point Rozzo:oops:
(But remember Nobody likes a smartarse
)
Posted: 29 Sep 2008, 07:55
by HarryMann
Crack Heads - Is it the end?
.. of the world as we know it?
Not those external cracks, I would think..
Posted: 29 Sep 2008, 11:36
by Mr Bean
HarryMann wrote:Crack Heads - Is it the end?
.. of the world as we know it?
Not those external cracks, I would think..
Past tense:
End of the world as we knew it. Yes my generation had the best of it!
Cheers
Ex rocker petrol head nutter Ken
'
