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Old 06-27-2017, 05:48 AM   #1
anarchy13
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Default Anarchy13 Engine Assembly Thread

Any threads on doing this? After changing my piston rings I cant get my pistons to go back in the cylinder? Do I need another person to help hold something or can this be done alone? I have the ring compressor tool already wrapped around my rings! Oiled up real good too!!! But I can't get the tool to slide down as I push down on the jug!

Also when putting new rings on, when I turn them so the gaps of each ring are spaced from each other like in the book, do I do the rear the exact same way like the front piston, or the exact same way facing the other direction? Understand what I mean?
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Old 06-27-2017, 06:35 AM   #2
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Default Re: Sliding jugs over pistons!

If you're using an automotive ring compressor it will be marked "bottom" and that arrow should face up on the piston. Car stuff is inserted into the bore from the top. No matter the arrow should point to the bottom of the cylinder. Another thing is the ring compressor can be too tightly installed on the piston. Just tight enough to allow the ring to exit into the chamfer on the bottom of the cylinder easily.

I hold the piston w/left hand and rock the cylinder gently with the right. Back and forth while pushing gently watching to insure the ring doesn't snag or pop out of the compressor. If it doesn't look right start over. I do not use a lot of oil on ring piston or cylinder. Just enough to stop rust-no more. I do wipe the ring with a finger dipped in fresh oil before installing on the piston. Not much. Just a film to stop fretting on first start up.

Ring end gap spacing is same front and rear.
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Old 06-27-2017, 07:27 AM   #3
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Default Re: Sliding jugs over pistons!

I use a cut off steel can wrapped around the piston with a couple of large hose clamps , all lightly tightened and with plenty of oil until the piston and rings will slip just enough to cram them in the base of the cylinder. Also use the rocking motion as described by Geezer. Needs to be a straight sided can, not corrugated, of course. I find plenty of Mexican and Asian foods come in straight walled cans. If I did it more often, sure I'd get an automotive clamp, but I try not to have to do it too often!

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Old 06-27-2017, 10:48 AM   #4
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I'm saying is the ring gap spacing faced the same way for front and rear? Or do I space them the same just vice versa since the other piston is turned the other way, or does it matter? Thx for the tips!
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Old 06-27-2017, 11:31 AM   #5
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Default Re: Sliding jugs over pistons!

as long as the rings are staggered it doesn't have to mirror the other pistons rings,....
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Old 06-27-2017, 11:40 AM   #6
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Default Re: Sliding jugs over pistons!

Agreed, as long as the gaps are staggered per the related guidance, front to rear matters not.
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Old 06-27-2017, 01:06 PM   #7
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Default Re: Sliding jugs over pistons!

I don't think it matters much cause the rings are moving around in the bore anyway.I just stagger the gaps and place them halfway between the wrist pin and the face of the piston.I do mine alone so I made a clamp that holds the rod from moving which make a big difference.You don't need to bind the ring compressor on the piston,just get it snug enough to squeeze the rings and make sure it is square on the piston.I hold the piston and try and place the cylinder so that it rests on the square compressor and give it a firm slap with the palm of my hand.
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Old 06-27-2017, 01:19 PM   #8
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Default Re: Sliding jugs over pistons!

Have you checked ring gap?
I agree with the above mentioned suggestions

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Old 06-27-2017, 03:03 PM   #9
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Got er dun! Yep checked the gap best I could according to the book! Only checked the gap when doing the first cylinder tho cause figured on the second everything is the same size? Am I safe?

After I tighten the bolts and put the heads on I will have some questions about how to put the camchest parts back inside properly and lifter blocks and what to look for when doing these. I should probly start another thread or search the topic when I get that far!

Thx so much guys for rushing to assist heres a pic with the jugs back on haven't tightened the bolts yet so if there's any last minute tips lemme know! Was my first ring job, pretty intense
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Old 06-27-2017, 03:38 PM   #10
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The only thing I didn't see in the book was when checking the gap how far in down in the top of the jug should each ring be? And too much gap is better than not enough right? And if I didn't have enough gap how would I file it down?
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Old 06-27-2017, 03:41 PM   #11
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... And do you check one ring, pull it back out, put the next one in and check it , and so on? That's how I did it anyway!
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Old 06-27-2017, 05:37 PM   #12
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Default Re: Sliding jugs over pistons!

Quote:
Originally Posted by anarchy13 View Post
The only thing I didn't see in the book was when checking the gap how far in down in the top of the jug should each ring be? And too much gap is better than not enough right? And if I didn't have enough gap how would I file it down?


At the bottom of the bore:



There are proper tools for grinding the rings. You can do it cowboy style, but there is a risk of damage. Try to rig up something to keep the edges as square as possible, do you have a dremel or die grinder to bodge together something like this?


Am I the only person who remembers your previous thread and wants to know what route you decided to go with the motor?!
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Old 06-27-2017, 09:15 PM   #13
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Default Re: Sliding jugs over pistons!

Wait to tighten the cylinders and heads until you check your intake line up, you can twist heads and cylinders to arrive at best manifold alignment.
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Old 06-28-2017, 04:28 AM   #14
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I actually pushed em in only a couple inches into the top of the jug! Put em in by hand and then pushed em down alittle further by turning the jug upside down and pushing them in with the piston that's already connected on the rod. Did one after the other, the scratchy sound they made as they slid kinda made me wonder if I was doing it right. But if they gotta b down deeper toward the bottem I did it wrong anyway! Do I measure each ring in the exact same spot? What R the chances the gaps off? And if the rings fit straight out the box in 1 cylinder will they fit the other without having to measure?

As far as the other motor cases are split, cranks been pressed out, found no other damage than the chip at the top where the rods banged the web divider and already had that welded. Will reuse cases and rebuilt as soon as I can find and afford the parts!!! Looking for jugs, pistons, and a complete crankshaft assembly that's already been weighed and all! Will post to the original OLD thread when I get that far! Thanks for asking.

This one here is a replacement motor. Installed it and the head gaskets were blown and cases were leaking also from inbetween Just got done sealing them! And am trying to slap her back togethor now!

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Old 06-28-2017, 06:37 AM   #15
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Default Re: Sliding jugs over pistons!

If your freshly honed cylinder has a taper you need to find a new machinist.
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Old 06-28-2017, 09:27 AM   #16
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Default Re: Sliding jugs over pistons!

Are they honed? I missed that.

Re: measuring - yes, take the same measurements on both jugs, for peace of mind as much as anything else. Shortcuts are a false economy when you have an engine apart.
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Old 06-28-2017, 09:58 AM   #17
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Ya after pulling the jugs off I used a flex hone and bought size .20 over new rings. That's the same number that was on the top of the pistons. Also I still don't understand do I insert one ring, how far in, remove and then do the same with the next?
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Old 06-28-2017, 10:08 AM   #18
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What if I wanted to install new pistons for piece of mind since I think the old ones may not be any good considering I might of found what looks like a crack on the inside and the scuff marks and scratches on the outside. Can I just buy them .20 over and those new ones will go right in like the old ones?

Or can I save my money and reuse these since they look bad but still feel smooth all around and that crack on the inside seem does not seem to go through either!
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Last edited by anarchy13; 06-28-2017 at 11:21 AM.
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Old 06-28-2017, 12:48 PM   #19
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Another close up of the crack. Is this reason enough to replace em or is it maybe something just in the molding that I can get by with ...... ? I'm askin cause I ain't rich on the other side of the metal with the crack looks fine!
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Last edited by anarchy13; 06-28-2017 at 01:09 PM.
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Old 06-28-2017, 01:51 PM   #20
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Default Re: Sliding jugs over pistons!

I don't know if that "crack" you see in the piston skirt is anything to worry about or not, I'd have to get a good look at it in person to really decide. I put some pix on my own website of my last motor rebuild, a '62 pan with 0.060 over pistons. The 0.060 rings were too wide at the end gaps, about 0.025 or more, so I ordered a set of 0.070 rings and end gap filed them to get the fit I wanted. Used an appropriate ring filer I bought for about $50, to do the job right. Photo below. You can see what I did on my '62 motor HERE.
Good luck with it.
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