Re: 91 civic - tough question about cooling
Burt wrote:
> "jim beam" <nospam@example.net> wrote > > >>original surface on these things is near mirror. that way, there's no >>small grooves for gas to leak along. if the head was machined on a >>traditional milling machine, particularly this alloy head, it's /very/ >>hard to do without leaving scoring marks in it. last time i had to lap >>a head was to cut out the grooves from a bad machining job where the >>cutting die was picking up excess material on each pass of an exterior >>edge, then dragging that chunk across the rest of the head leaving gouge >>marks. > > > Try using a single-blade cutter, instead of the two-bladed cutter. This > is slower but yields a cleaner cut. > > If they're caused by deposits, try removing the hard calcium deposits around > the water jacket openings. The deposits can be picked up by the tooling > and drug across the surface leaving a groove. it shouldn't be machined at all [or at least, not with "traditional" gear] for the reasons stated. it just needs to be lapped on a properly flat rigid bed. |
Re: 91 civic - tough question about cooling
Radiators are relatively soft. I once saw the neck of the radiator had
become "out-of-round", causing several new radiator caps to blow air bubbles into the puke can because an effective seal was not formed. A new radiator fixed the problem. You might check for gunk build-up in the neck which could cause an incomplete seal. Later, Ralph |
Re: 91 civic - tough question about cooling
Radiators are relatively soft. I once saw the neck of the radiator had
become "out-of-round", causing several new radiator caps to blow air bubbles into the puke can because an effective seal was not formed. A new radiator fixed the problem. You might check for gunk build-up in the neck which could cause an incomplete seal. Later, Ralph |
Re: 91 civic - tough question about cooling
Radiators are relatively soft. I once saw the neck of the radiator had
become "out-of-round", causing several new radiator caps to blow air bubbles into the puke can because an effective seal was not formed. A new radiator fixed the problem. You might check for gunk build-up in the neck which could cause an incomplete seal. Later, Ralph |
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