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Old December 26th, 2005, 10:13 PM   #1
Captain Ledd
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Red face Really newb question about 258 piston removal.

I'm trying to get the pistons and rods out of a 258 that's been sitting in our quanset hut for 20 or so years with the heads off. I got the crank out and the 2 middle pistons out of the cylinders. There seems to be a ridge along where the main bearings are and the rings are getting stuck on it. I've messed with the 2 pistons for about an hour with no sign of progress. They pretty much have to come out of the bottom, the top is way too rusted and has a hell of a ring land. So whats the trick?

Most everything is expendable except the connecting rods. :miff:


... stupid engine...
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Old December 26th, 2005, 11:59 PM   #2
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engines were designed to have the pistons installed and removed from the top... u can try popping the rings off to give a lil bit more room to snek by on the bottom, But i would recommend taking a dingleberry hone to the cylinders and a ridge reamer so u can get the pistons out... but if all u need is the rods, Maybe just use a cutting device and cut the piston dome off ??
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Old December 27th, 2005, 01:57 AM   #3
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Every engine I have worked on thus far has had no complaints about the pistons being removed/installed from the bottom, granted, I haven't done very many. I'll pay a visit to my neighbor tomorrow for a sawzall. Shouldn't take too long to chop up aluminum..
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Old December 27th, 2005, 07:59 AM   #4
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uhh.. if you aren't worried about the pistons or the block, hit them with a fucking hammer. Quit being a pussy.
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Old December 27th, 2005, 09:46 AM   #5
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Quote:
Originally Posted by Captain Ledd
Every engine I have worked on thus far has had no complaints about the pistons being removed/installed from the bottom, granted, I haven't done very many. I'll pay a visit to my neighbor tomorrow for a sawzall. Shouldn't take too long to chop up aluminum..
How are you compressing the rings when installing them from the bottom?

If that motor has been sitting that long, use a 5lb. sledge and a pipe and beat them out. Those piston's won't cut as easy as you think. Especially the pin, you take a greater chance of fawking up the block then you will the piston's.
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Old December 27th, 2005, 01:06 PM   #6
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I did use a 5lb sledge, until I broke it. I had to finish the job with the other end of a splitting maul and a 1" square chunk of solid steel rod because my pipe bent after I switched to the maul.

As for compressing the rings, just a standard ring compressor. The V8 I worked on a while back I put the pistons in from the top though. The time I put pistons in from the bottom, due to the rigged nature of our tractor engine stand, flipping it over was difficult. With stuff still to go in on the bottom like the crank and tightening all the nuts and bolts down we just put them in from the bottom.

*Edit: Actually, the block is expendable too. I was considering chopping off the part around the main bearings with the torch. I can imagine there are a lot more 258's out there in far more rebuildable condition than this one.

Last edited by Captain Ledd; December 27th, 2005 at 01:28 PM.
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Old December 27th, 2005, 05:32 PM   #7
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Just use a rounded file and file off the ridge around the top of the cylinder; You can use a dremel also. Normally a hone would be used to remove the ridge before the piston is removed, but if your not worried about messing up the block...
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Old December 28th, 2005, 01:09 AM   #8
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Well, thanks anyways guys. I was just wondering if there was some trick or key to getting the pistons out that I didn't immediately see. I'll figure it out from here.
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Old December 28th, 2005, 11:39 AM   #9
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Installing pistons from the bottom.....hahahaha....ohhhhh....hahahaha....good one.
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