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Removing Pistons

 
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Old 08-30-2009, 08:34 PM
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Removing Pistons

I took the head off of my 5th gen prelude to get some work done on it and I figured I'd do what I can to help remedy my oil burning problem.

I want to take my pistons out and replace the piston rings. I've been searching google and my general understanding of the procedure is as follows:

1. Remove oil pan
2. Remove the bolts holding the connecting rod to the crankshaft on cylinder 2 and 3 then push the pistons out the top of the block.
3. Rotate crank, repeat step 2 for cylinder 1 and 4

Is that about right?

A friend will be replacing the piston rings for me once i get the pistons out.

Are there any particular things that I should be aware of before I attempt this?

Thanks in advance.
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Old 08-30-2009, 08:55 PM
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Re: Removing Pistons

its a lil more involved than that. you also gotta take off the axles, tranny, oil pump (timing belt should already be off if you took the head off), header, oil pan, oil pickup, oil baffle, main cap bridge, then take the rod ends off and pull the pistons out from the bottom.
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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 08-30-2009, 10:47 PM
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Re: Removing Pistons

hey nick he doesnt have to go that far.

heads off... drop pan, remove the sheild, and sump. you need 10mm 12 point socket to loosen the bolts. yes its gonna be a pain pushing the rods up and out. you do not want to move the crankshaft around too much... use something to push them out w/ a long screw driver... HANDLE SIDE to push but not on the bearing part... (the part where the bolts go through). LABEL EACH PISTON, ROD CAP... AND THE WAY THEY ARE FACING.

when reinstalling..... you will need a piston ring compressor, a quick honing TOOL, and a helms manual.... good luck.
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Old 08-30-2009, 10:55 PM
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Re: Removing Pistons

o yea true.

but taking out the crank is funnnnnnnnn!!!!!!!
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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 08-30-2009, 10:59 PM
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Re: Removing Pistons

dont let the edges of the rod touch the cylinder wall. I'd be weary, however, of putting an autozone DIY hone on it. Those hones are typically made for iron cylinder walls, not FRM.

If the cylinder walls still have a good crosshatch without any noticeable signs of wear on the cylinders then just put the rings in (make sure the are gapped properly) and do a proper ring seat procedure.
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Old 08-31-2009, 12:23 AM
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Re: Removing Pistons

Quote:
Originally Posted by Bustr View Post
hey nick he doesnt have to go that far.

heads off... drop pan, remove the sheild, and sump. you need 10mm 12 point socket to loosen the bolts. yes its gonna be a pain pushing the rods up and out. you do not want to move the crankshaft around too much... use something to push them out w/ a long screw driver... HANDLE SIDE to push but not on the bearing part... (the part where the bolts go through). LABEL EACH PISTON, ROD CAP... AND THE WAY THEY ARE FACING.

when reinstalling..... you will need a piston ring compressor, a quick honing TOOL, and a helms manual.... good luck.
Yeah that's what I figured. I planned on just turning the crank with the crank pulley bolt.

The cylinder walls look alright, no scores or major scratches...Is there a type of cloth or sandpaper that's ok to use on the FRM walls? I don't really want to take the block out by myself and my main goal is just to get the car running again so I'll make do with what I have.
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Old 08-31-2009, 12:49 AM
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Re: Removing Pistons

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Originally Posted by menacingone View Post
Yeah that's what I figured. I planned on just turning the crank with the crank pulley bolt.

The cylinder walls look alright, no scores or major scratches...Is there a type of cloth or sandpaper that's ok to use on the FRM walls? I don't really want to take the block out by myself and my main goal is just to get the car running again so I'll make do with what I have.
use WD40 and a lint free towel to clean the walls off. When you go to reinstall the pistons, coat the cylinder walls and the inside of the ring compressor with WD40. If you use one of those cheap ring compressors from autozone, etc...be sure that the bottom of the compressor is seated flat to the deck of the block. if the compressor is not flat to the block deck, the ring will pop out. Becareful of this because you can damage the ring if you try to smack the piston down without the ring being compressed.
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Old 08-31-2009, 02:29 AM
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Re: Removing Pistons

What would you suggest I clean the tops of the pistons with? They are covered with carbon buildup.
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Old 08-31-2009, 08:28 AM
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Re: Removing Pistons

drill wire wheel
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Old 08-31-2009, 01:57 PM
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Re: Removing Pistons

yeah a wire wheel and some brake cleaner will take it off good. yeah like ^^ said.. be sure to have the ring compressor flush with the block.. ive seen to many people ruin some new rings by a simple mistake.. once you clean em just use a rubber mallet or somethin to hit the pistons with. use a lot of WD40! its not gonna hurt if you put a shiit load but it will if you dont put enough. gl!
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