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Registered
Join Date: May 2007
Location: n.y. upstate
Posts: 191
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Question: Damaged piston
I have a set of Mahle pistons and cylinders that were new in 04. They have 20,000 miles on them since new. One piston showes damage on the top like something was left or fell into the cylinder during rebuild. I have the paperwork from rebuild in 04, and know the engine has not been apart since then. There is now a very small crack in the piston. Can I buy just one piston?
Mahle, piston markings(95L67), (R 021) Cylinder: showes no damage. 95ZN1 ++ W15 How should I fix this problem? Thanks Phil 
Last edited by a320; 03-09-2013 at 04:20 PM.. |
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03-09-2013, 10:41 AM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,500
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95L67 is a Mahle 9.3 piston.
I would replace it by size if the cylinder isnt damaged. Read the size on the cylinder next to the triangle with the 5 or 6 inside, it will be size ), 1, or a 2. You can post in wanted and for sale section and you should get an answer. Bruce |
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03-09-2013, 01:55 PM
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Join Date: May 2007
Location: n.y. upstate
Posts: 191
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Bruce,
The cylinder showes no damage. 95ZN1 ++ W15 |
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03-09-2013, 02:59 PM
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Straight shooter
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Re: Question: Damaged piston
What did the combustion chamber in the head for that cylinder look like? Might be worthwhile if you took the valves out to see if any debris might have been caught between the valve and seat.
__________________
“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.” ― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values |
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03-09-2013, 05:51 PM
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Registered
Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
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I once made a mistake in holding the air horns to an aftermarket air filter base onto carbs on a 911 motor. I used short bolts instead of studs and nuts. The bolts rattled loose, and during a race at least one bolt fell into each of the three cylinders on that bank. Time has destroyed my memory of what, if any, damage this did to the valves (maybe nothing). The heads, with some clean-up work, were otherwise OK. And two of the three pistons could be cleaned up. Neither were pristine, but worked just fine for years thereafter. One piston had the top ring land compressed, so it had to be replaced.
A crack in the bottom oil ring land (if I interpret the photo correctly) seems a bit odd, but there it is. It would be a bold guy who would try to reuse that. What prompted you to take the motor apart? Lots of guys like to switch from the US 9.3 pistons to the Euro 9.8s, which suggests there may be a nice buyer's market in used but in spec 9.3s out there. |
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03-09-2013, 06:03 PM
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P911
