On some 2006-08 and early production 2009 Civics, the engine (cylinder)
block may experience coolant seepage that can result in engine
overheating. For this reason Honda extended their warranty of the
engine block to 8 years from the original date of purchase, with no
In my case, the Honda dealer had to replace the whole engine block free
I don't think you'll find perfect castings anywhere, from anybody. All
automakers inspect their blocks prior to building the engine, but defects
sometimes only reveal themselves after lots of vibration and many heat/cool
Considering how many engines get built in any given year, flaws bad enough
to cause problems are extremely rare.
I don't think anything's changed at all over the years.
- one mention of oil leaks due to casting porosity from 1991,
- one mention of the same thing from 2001.
- one mention of cracks in the casting from ~2010 (the date of the TSB).
it's pretty much meaningless. if a quality defect is present, it's
unlikely to be present for all the factories that manufacture the same
part - it's usually restricted to just one source. honda engine blocks
are produced in ontario, suzuka and ohio to my knowledge - so which one
if one is present in the product of all three plants, then there's a
fundamental design/spec issue, not a production quality issue..
not true. lots of complex forms like jet engine components are cast,
and their porosity rate is zero. that's high end. cast iron frying pan
porosity rate, which are as cheap as it gets, is zero.
casting porosity is the result of solidification voids. these are
either due to:
1. gas coming out of the liquid as it cools, just like the air bubbles
you see in ice that make it not clear.
2. shrinkage between the metal crystals that grow on solidification.
both mechanisms are very well researched and very well understood. they
are easily avoidable with any competent producer that's not cutting
corners on the alloy, its preparation, and the casting process.
not porosity - that's there day one. you can "fudge" its presence with
the old fashioned "stop leak" preparations like crushed walnut shells,
but they don't last forever. once they've softened, passed through,
then the leaking starts again.
no, they're what the manufacturer considers to be "economically
acceptable", i.e. the cost of repairing failures is less than the cost
of the q.c. necessary to eliminate the failures in the first place.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.