crank case cracking?????
07-20-2009, 11:59 PM
#31
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07-21-2009, 08:04 AM
#32
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07-21-2009, 11:18 AM
#34
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If I get a chance I will check my 1993 and see if it has the same irregularity.
07-21-2009, 12:00 PM
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07-21-2009, 03:58 PM
#38
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The early cars using the dies will have perfect castings, then over time the die will erode and cracks will appear in heat and stress areas.I doubt if there is a car out there without these marks and if there is no oil showing I honestly can't see it being a crack,oil seems to escape everywhere else without problem,if it was a crack it would probably resemble the Exxon Valdez.
07-21-2009, 04:23 PM
#39
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The early cars using the dies will have perfect castings, then over time the die will erode and cracks will appear in heat and stress areas.I doubt if there is a car out there without these marks and if there is no oil showing I honestly can't see it being a crack,oil seems to escape everywhere else without problem,if it was a crack it would probably resemble the Exxon Valdez.
07-21-2009, 04:42 PM
#40
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You really need to get under there an look very carefully to see them... I was looking at KIRKF's rebuild to see if I could spot the marks but, I don't see them in the pictures. I would be good to have a larger sample. Anyone care to take a look?
07-21-2009, 06:43 PM
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You are correct Cobalt,dies are expensive and replacement due to heat erosion will only occur when the life expectancy of the die is met,often part sections of the die are replaced as some areas are expected to erode as temperature and high alloy velocities take their toll.Having worked in high pressure diecasting for some years I just wanted to put owners mind at ease that hairline marks on castings are not uncommon and is not something to worry about.You will often find castings to have been shot blasted,quite often a secondary operation to hide die marks, so lets not all panic yet.
07-22-2009, 11:14 AM
#42
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You are correct Cobalt,dies are expensive and replacement due to heat erosion will only occur when the life expectancy of the die is met,often part sections of the die are replaced as some areas are expected to erode as temperature and high alloy velocities take their toll.Having worked in high pressure diecasting for some years I just wanted to put owners mind at ease that hairline marks on castings are not uncommon and is not something to worry about.You will often find castings to have been shot blasted,quite often a secondary operation to hide die marks, so lets not all panic yet.
What made you leave the foundry business? It is one of the tougher businesses to be in today.
08-12-2009, 10:46 AM
#43
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Update.
I had a chance to do tech on a half dozen 964's including mine and 2 964 Cup Cars the other day. All the cars had the identical markings including my 93 and the cup cars so obviously this was a defect in the tooling that has lasted most of if not all of the production run.
08-12-2009, 11:03 AM
#44
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I had a chance to do tech on a half dozen 964's including mine and 2 964 Cup Cars the other day. All the cars had the identical markings including my 93 and the cup cars so obviously this was a defect in the tooling that has lasted most of if not all of the production run.
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