gourdoster
NAXJA Forum User
- Location
- Ithaca ny
I recently pulled the head and found all the tops of the pistons were dented.Like somthing had bounced around.There were no markes on the head.Was wondering what might of been the cause.:explosion
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piston tops
- Thread starter gourdoster
- Start date
5-90
NAXJA Forum User
- Location
- Hammerspace
AMC242 pistons have "D"-shaped dishes in the deck, probably to reduce overall compression ratio with the high displacement. They are also quench complaint (meaning that slightly higher compression is possible with low-octane fuel than normally doable.)
You should note regular and consistent "D"-shaped depressions in all six piston tops. The use of truly "flat" piston crowns in automotive engines is increasingly rare - I think the last time I saw a flat pison it was in a powerplant for a LeRoi industrial air compressor.
5-90
You should note regular and consistent "D"-shaped depressions in all six piston tops. The use of truly "flat" piston crowns in automotive engines is increasingly rare - I think the last time I saw a flat pison it was in a powerplant for a LeRoi industrial air compressor.
5-90
gourdoster
NAXJA Forum User
- Location
- Ithaca ny
Tiny dents shaped like a keyway around 20 or so on each piston.
langer1
NAXJA Forum User
- Location
- Mineral City,Ohio
Nicks from floating the valves?
gourdoster
NAXJA Forum User
- Location
- Ithaca ny
That sounds right is that from high rpms blown head gasket?
langer1
NAXJA Forum User
- Location
- Mineral City,Ohio
High RPM
gourdoster
NAXJA Forum User
- Location
- Ithaca ny
gourdoster
NAXJA Forum User
- Location
- Ithaca ny
All those silver flecks are dents.
langer1
NAXJA Forum User
- Location
- Mineral City,Ohio
On number three? That look like water damage.
gourdoster
NAXJA Forum User
- Location
- Ithaca ny
It had a blown head gasket there was water seeping into cylinders.The one thats at top was dinged by spark plug breaking off but don't know about the others.