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Need advice on replacing piston rings B210 A-14


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#1 BestyBlue77

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Posted 11 January 2018 - 10:47 AM

Hey gang! I'm ready to put in these new piston rings & I just wanted to get some advice or tips before I start on anything I should know from experienced Datsun folks. This will be my first time doing rings, and I run into any snafoos I'm blaming you all! Haha. Just kiddin'.

I'm pretty confident I can do a nice job on this project. I've done a few head gasket jobs, and also a few new timing chains, and they've all been successful. Plus a whole slew of other restoration type adventures involving the engine, complete cylinder head rebuild, carburetor & the entire fuel system, brake system, electrical, etc.

I'd like to start with how to remove the Pistons. So once I have the cylinder head and oil pan removed, what do I do next?

#2 datsunrides

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Posted 11 January 2018 - 11:34 AM

1st, if you have a ridge on the top of the cylinders, a  ring job will do you no good. If there is no noticeable ridge, disconnect the rod bearing caps and tap the rods/pistons up with something like the wooden end of a hammer (something soft-ish). Once out, get a bottle brush hone and with some WD40 for lube go up and down at a steady, even pace until the walls are not shiny and have a cross hatch pattern. You will probably need to wipe the cylinders down a few times to verify. (Note, if after a minute or 2 of honing you still can see deep scratches or pits, you will be better off boring the cylinders and getting new pistons) I would suggest you only use cast rings as they are not so fussy about hatch pattern. Moly would probably also be fine, but avoid chrome unless you have a shop do the honing. Make sure you clean the ring lands in the pistons of any carbon buildup. Check the end gaps with the rings in the actual cylinder you plan to install them in (Oh, and you should make sure what size pistons you have. If they are oversize, they will probably be stamped on the top of the piston). When you install them on the piston, make sure the gaps do not align. Put a light coat of oil on the rings and piston skirts and install them using a ring compressor and tap them in with the hammer handle, noting that the arrow on the piston faces forward. I usually but a small section of fuel line on the rod bolts so they do not damage the crank. Install new rod bearings and tighten the cap to spec.



#3 BestyBlue77

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Posted 11 January 2018 - 12:04 PM

Great! Thanks for the thorough reply! I forgot to mention I just had the head off about a year ago & haven't put many miles at all on it since. The cylinders are in excellent condition & still have the original cross hatching marks with no marks, scratching, or scraps of any kind visable on any of the cylinders. I have a buddy that's a mechanic & he came over to take a look at them & said they were good to go. I should have replaced the rings at that time, but I had a bunch of other projects going on & needed to just get it back together, so I could drive it a while. I did resurface the engine block, so that's good to go as well. Ya, I'm pretty much kicking myself in the butt for not doing it then, but we live & learn, right?! (Hopefully!)

That being said, I bought original sized rings to replace the old ones. I'll post a few pics here in a minute to show ya what I've got.

#4 BestyBlue77

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Posted 11 January 2018 - 12:43 PM

These are the rings that I purchased: Sealed Power by Federal Mogul. E-365X Standard Piston Ring Set (2) 2.00mm, (1) 4.00mm; Iron; .75mm Oversize. These are recommended by Napa & Oreilly's.

https://napaonline.com/en/p/SEPE365X

#5 Lockleaf

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Posted 11 January 2018 - 01:37 PM

These appear to be cast iron. Cast iron rings will accept deviation in the cylinder better but have a much shorter life expectancy. They are the best option to put into an unprepped cylinder. They give about 20k miles. If you're good with then, then those are great.

BUT you shouldn't be using oversized in this scenario. You should be using STD size rings.

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#6 banzai510(hainz)

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Posted 11 January 2018 - 02:23 PM

all my rings were cast iron. My L16 in my 521 is now at 175k .

Bu yea I think you get same size rings or maybe .25mm over rings if you have a std size piston. But Im not positive I have my machine builder do this but have used sealedpower also


Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#7 datzenmike

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Posted 11 January 2018 - 05:28 PM

These are the rings that I purchased: Sealed Power by Federal Mogul. E-365X Standard Piston Ring Set (2) 2.00mm, (1) 4.00mm; Iron; .75mm Oversize. These are recommended by Napa & Oreilly's.

https://napaonline.com/en/p/SEPE365X

 

They are recommended IF you overbore the block and use over size 76.75mm pistons.   Will you?

 

 

Measure your bore in three places. Measure the piston for each bore. Should be 76mm for an A14. Piston to wall clearance should be between 0.001" and 0.018" give or take. If much over that it should be over bored and over size pistons used. Using a 0.75mm over size ring to make up the difference is not advised. Certainly NOT without some measuring. When compressed the ends may touch or touch when heated up and they will break.

 

No mention of honing the cylinder walls. If the stock pistons and walls are withing spec the wall will be too smooth to wear the rings in. If using case iron for this you need a special hone.

 

If going to larger pistons and over boring the finish will be perfectly round and no taper. For this you can use chrome molly rings for much better seal and longer life.


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#8 BestyBlue77

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Posted 11 January 2018 - 07:28 PM

They are recommended IF you overbore the block and use over size 76.75mm pistons. Will you?


Measure your bore in three places. Measure the piston for each bore. Should be 76mm for an A14. Piston to wall clearance should be between 0.001" and 0.018" give or take. If much over that it should be over bored and over size pistons used. Using a 0.75mm over size ring to make up the difference is not advised. Certainly NOT without some measuring. When compressed the ends may touch or touch when heated up and they will break.

No mention of honing the cylinder walls. If the stock pistons and walls are withing spec the wall will be too smooth to wear the rings in. If using case iron for this you need a special hone.

If going to larger pistons and over boring the finish will be perfectly round and no taper. For this you can use chrome molly rings for much better seal and longer life.


I'm going to be using the stock pistons & everything is within spec. Should I still give the cylinders some fresh cross-hatching? Also what kind of rings would be the best in my case for best performance & longest life? Thanks everyone!

#9 datzenmike

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Posted 11 January 2018 - 08:36 PM

If you are sure they are stock size get standard size cast iron rings and hone the cylinder walls. The fresh roughing of the walls will wear the rings in for a good seal to hold in compression. Cast iron are best on a used, non perfect cylinder wall.

 

Make sure you put the rings for each piston in the cylinders they will go in and carefully measure the end gaps. Generally the amount is 0.0045" for every inch of bore. Too much gap looses compression. Too little gap and the rings will expand with the heat and touch breaking them and the piston. On a used bore this is unlikely but... For a 78mm bore that would be 0.0045" X 2".99 = 0.013" of gap. The second ring can be the same or a little tighter.

 

Follow the ring maker's recommendation for position of the ring end gaps when installing the pistons. The last thing you want are the gaps lined up and loosing compression.


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