HEMI 5.7L Engine Damage - Pistons and Cylinder
#12
Well since I am in Alaska, shipping is usually a big factor. However luckily enough I did manage to source an engine locally that's priced at $2,100. It has a claimed 29,000 miles (I'm always a little suspicious of used engines, but it is at a big well known salvage yard).
Any thoughts on whether it is possible to replace that cylinder with the engine still in the car? It looks like if you drop the oil pan you would have enough room, but I am not sure. That piston is by far the worst, the others have surface dings and a couple have no damage at all.
Also, would honing remove those scratches?
Any thoughts on whether it is possible to replace that cylinder with the engine still in the car? It looks like if you drop the oil pan you would have enough room, but I am not sure. That piston is by far the worst, the others have surface dings and a couple have no damage at all.
Also, would honing remove those scratches?
as far as the cylinder goes, leave it alone. those little cuts (from pictures) don't look deep enough to do anything. you'll likely do more harm than good doing a bottle brush hone job on a modern engine.
#15
#16
#17
That is clear cut sign of detonation. Not many guys know the real danger involved.
If it were from metal chunks, where did they come from? if you say the piston itself, there's no real chunks missing and the only way to get the piston to even chunk or break off is from detonation.
To the OP, i would get the Vin# of the truck the engine went to and pony up for a carfax and check the mileage and salvage report out. Worth the $15. And if they say they don't have the vin, they are either lying or they aren't that big of a company, because i think by law they have to keep records where the engine came from due to the overwheming theft of car parts going on these days.
I wouldn't just leave that cylinder as-is, and no you can't sleeve it in the bay. You need to pull it and send it out. i wouldn't spend my time or money just putting new stuff into it and leaving it as is unless the scratches are so superficial(doubtful). When i say superficial I mean tha the honing markes are still present going through the scratches. if you lose the hone mark, then they are generally too deep.
Last edited by dirtydog; 02-10-2010 at 08:32 AM.
#18
That is clear cut sign of detonation. Not many guys know the real danger involved.
If it were from metal chunks, where did they come from? if you say the piston itself, there's no real chunks missing and the only way to get the piston to even chunk or break off is from detonation.
To the OP, i would get the Vin# of the truck the engine went to and pony up for a carfax and check the mileage and salvage report out. Worth the $15. And if they say they don't have the vin, they are either lying or they aren't that big of a company, because i think by law they have to keep records where the engine came from due to the overwheming theft of car parts going on these days.
I wouldn't just leave that cylinder as-is, and no you can't sleeve it in the bay. You need to pull it and send it out. i wouldn't spend my time or money just putting new stuff into it and leaving it as is unless the scratches are so superficial(doubtful). When i say superficial I mean tha the honing markes are still present going through the scratches. if you lose the hone mark, then they are generally too deep.
If it were from metal chunks, where did they come from? if you say the piston itself, there's no real chunks missing and the only way to get the piston to even chunk or break off is from detonation.
To the OP, i would get the Vin# of the truck the engine went to and pony up for a carfax and check the mileage and salvage report out. Worth the $15. And if they say they don't have the vin, they are either lying or they aren't that big of a company, because i think by law they have to keep records where the engine came from due to the overwheming theft of car parts going on these days.
I wouldn't just leave that cylinder as-is, and no you can't sleeve it in the bay. You need to pull it and send it out. i wouldn't spend my time or money just putting new stuff into it and leaving it as is unless the scratches are so superficial(doubtful). When i say superficial I mean tha the honing markes are still present going through the scratches. if you lose the hone mark, then they are generally too deep.
You're looking for something that runs and runs reliably. Those scratches in the bore aren't going to compromise a reliable ride. Swap the piston and rings, they'll seat.
87 octane didn't cause that mess, my money is on a head gasket and coolant getting in there. The clearance from the OD of the piston to the ID of the cylinder is too small for a chunk of piston ring to get up there, so a piston ring didn't cause that damage. I'd like to get my hands on some of those piston rings to check them out.
#19
if you hone the scratches out, you will need oversized rings, if you leave the scratches in, you will have gas by passing the rings and end up with blow by, of the gooey crap you pulled out of the filter from the bypass tube. The best thing to do with that engine, is replace it with a junkyard engine, or do a complete rebuild. Remove the block, bore all 8 holes and replace the pistons. Dollar wise, it is about the same either way, but you will, in essence, have a much better engine with rebuilding, but replacing is faster and less work. your choice.
#20
Here are some more pictures of the damage.
Passenger side - Cylinder 8 there on the right is pictured in the previous pictures. It has the worst damage.
Driver's side - Cylinder 7 on the left has the next worse damage. Though the damage is not as deep.
Cylinder 5 Close-Up
Cylinders 1 and 3 are not nearly as bad.
The valves all look good, but there is a little side damage on most of the cylinders.