You should also make sure the head is flat. If it was not milled
following the repair, it could be warped. This would cause the head
gasket not to seal. You can check it with a good straight edge.
Tom Hill
Ron Tebo wrote:
>
> steve sage wrote:
>
> > Hello Alpiners:
> > The good news is that I now know how to remove and replace the valve
> > train and re-torque the head without apparently braking anything and
> > making it worse! The bad news is that after I crossed my fingers for
> > luck and re-started the engine, the coolant still sprays out the back of
> > the head as well or better than before.
> >
> > Feeling around back there as the coolant sprays out, it sure seems that
> > it's coming from the head gasket, just underneath that metal "boss" at
> > the very back, left of the head (facing the firewall). It does not seem
> > to be coming from the freeze plug back there.
> >
> > Also, over the last few weeks I've noticed some white smoke out the
> > tailpipe (especially when cold and warming up) , and now that I've seen
> > the coolant spray, accompanied by a small bit of white smoke there too
> > that seems to match the color coming out the tailpipe, I wonder if my
> > head problem is related to that white smoke.
> >
> > The two possibilities I can figure are either a cracked head gasket or a
> > failed water passage, or a combinateion of both. Would a failed water
> > passage (failed welding from my engine/head rebuild) cause the coolant
> > spray from the head gasket, or maybe make the head gasket fail in this
> > mode? And would this cause that white smoke from the pipe?
> >
> > I guess my next step is to pull the head off, look at the gasket and see
> > if I can see anything funny at the bottom and back of the head, unless
> > someone has any other ideas or suggestions.
> >
> > Steve Sage
>
> Steve:
>
> If you are seeing white smoke, this is a signal that coolant is getting
> into the combustion area, and I would definitely pull the head, rather than
> running it any more, since this can damage your engine. Porosity is also
> often a problem with aluminum welding, especially if it was done with mig
> rather than tig welding. However, it looks like the only way to go is to
> pull your head and check it out!
>
> Ron Tebo
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 10:40:16 CDT