Poss. to replace one piston w/ engine in? - Ford Powerstroke Diesel Forum
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Old 06-23-2010, 07:28 AM
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Poss. to replace one piston w/ engine in?

'05 f350, #6 piston scorched from bad injector. Is it poss. to replace the piston by pulling the oil pan off? Do you have to break the bottom section of the block to get to the rod cap? Cab is off so I can lift or even remove the engine if needed.
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Old 06-23-2010, 08:22 AM
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Nope gotta pull the engine. You wont have enough room having it in the truck. Also if its scored you really gonna just put another piston and rings back in, you better hone it some and get the surface fixed or your rings are gonna get destroyed again. Also if your gonna go that far your better off replacing all the rings, and checking your block.
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Old 06-23-2010, 01:23 PM
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rod caps

Can you get to the rod caps with the pan off?
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Old 06-23-2010, 01:25 PM
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You wont be able to remove the pan unless you drop the trans and raise the motor up, taking the motor mounts off etc. Either way your gonna have to pull it in the end.
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Old 06-23-2010, 01:38 PM
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rods

With the motor out can you pull the pan and get to the rod caps without taking the crank out or splitting the lower part of the block?
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Old 06-23-2010, 01:51 PM
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You might be able to have enough access heres a picture of mine torn apart.

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Old 06-23-2010, 04:40 PM
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I can be done with the engine in, but you would have to pull the cab. Long story short the dealer dropped a screw down my intake and caused the valves in #3 to slap the piston. RCD had the cab off for studs and HGs and was able to jack motor up, pull pan and replace piston. But i didnt have any cylinder issues. Rescue is right about the honing issue.
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Old 06-24-2010, 12:53 AM
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piston

Thanks Rescue for the pic. Does not look too bad. Dealer pulled the cab and found the piston and I had them stop to either junk the truck or find a cheaper solution. Could not dump $13k in a new motor.

Head is off. I think I'll lift out the eng/tranny unit, roll it over and pull the pan and piston. Can the block be resleeved without total diassembly if the cylinder is scored too bad? And don't worry, it will be honed well if we can use the cylinder.
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Old 06-24-2010, 03:14 PM
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Add burned exh valve

Pulled the head off to look at the piston and it is fried. Checked out he head and one of the exh valve is partially eaten up. Seat looked ok but I will ck further. Anybody got 2 used intake and 2 exh valves laying around? I still might try to patch this thing up. I hate to get beaten by this thing.
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Old 10-05-2012, 07:19 AM
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Yes, you can replace a piston from below without pulling the cab or the tranny. I literally just did this last week.

Take all 8 motor mount bolts off the cross member, lift your engine a couple inches with a cherry picker, then pull your lower oil pan, up take tube and upper oil pan. You can then access your connecting rod bearings and push your bad piston out through the top of the head. It's really not that bad of a process, just be careful not to lift the engine TOO much.

This is obviously a late reply but may be of use to someone in the future.
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