replacing piston rings... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Kreator · 12-15-2004, 01:32 PM

does it require any machining work or can i just replace them and assemble the engine back together? Searched, but didnt really find much

thanks

*weirdstyles.net* · 12-15-2004, 01:41 PM

to the very best of my no-ledge machine work is nessecary to ensure a proper seal. If your doing this on any two-4-d we are taking at a minimum of a 6/7 year old car so I would recommend having block machined to spec for the pistons to be installed.

We going high performance or stock?

Kreator · 12-15-2004, 02:39 PM

stock, the idea was to just replace the rings....

how much machining would there be needed? Guess is the same as with a full rebuild right?

atom · 12-15-2004, 02:51 PM

If the gap checks out OK and the block is in good condition you'll be fine without machining the block.

nightwalker · 12-15-2004, 04:04 PM

probably no extreme machining, but a honing would be recommended.

kandyflip445 · 12-15-2004, 04:16 PM

Honing. But I've taken apart cars with over 100k and they still have the original crosshatch.

RBS14 · 12-15-2004, 05:26 PM

I highly recommend honing. You may be able to get away with just throwing new rings in but you are gonna kick yourself if they don't seal correctly because of too much gap and you have to do it again. Do it right the first time.

zeek · 12-15-2004, 05:32 PM

dont forget to correctly mis-align the rings 180 degrees off each other from the thrust angle of the piston skirt as well as the oil rings if you replaced those

*weirdstyles.net* · 12-15-2004, 07:42 PM

Quote:

Originally Posted by zeek

dont forget to correctly mis-align the rings 180 degrees off each other from the thrust angle of the piston skirt as well as the oil rings if you replaced those

this is the exact post i was looking for... the technical shit that I stare at for hours tryin to figure out wtf he's talking about...

zeek · 12-15-2004, 08:09 PM

do you or dont you understand what i posted weirdstyles

ledzeppelin240 · 12-15-2004, 09:51 PM

Ok for starter do not replace the piston rings with any other kind besides cast iron. They are the only ring that will make a seal in a bore that has not been machined.

You should Hone the cylinder with a flex hone or a spring loaded one to break the glaze and give the cross hatch so that the oil has a channel to hold on to, this will provide proper lubrication. Lacquer thinner might remove the glaze as well. Double check that the rings fit the pistons correctly and that the ring lands are not worn. Also make sure they fit the cylinder correctly. Like said above ring gaps should all be offset 180degrees. Good luck...

Chris

96twofourty · 12-15-2004, 10:42 PM

I was reading this mustang mag a few years ago and they were building an engine and used a honing tool that they attached to the end of a drill. Dont know how accurate it would be but you need something

kandyflip445 · 12-15-2004, 11:58 PM

Accurate? It was either a ball hone or a 3 stone hone. Either one will work.

Kreator · 12-16-2004, 07:40 AM

thanks for the help guys. Thinking about it though, its probably cheaper timewise to find a used engine and swap that in instead of taking the engine apart and then most likely messing something up putting it back together. Probably will stick with that idea.

12-15-2004, 01:32 PM	#1
Kreator Nissanaholic! Join Date: Mar 2002 Location: MD Age: 41 Posts: 1,975 Trader Rating: (0) Feedback Score: 0 reviews	replacing piston rings... does it require any machining work or can i just replace them and assemble the engine back together? Searched, but didnt really find much thanks __________________ кто болеет за Зенит, у того всегда стоит!

12-15-2004, 01:41 PM	#2
weirdstyles.net This guy... Join Date: Feb 2003 Location: South Jersey Age: 41 Posts: 889 Trader Rating: (0) Rides Gallery: weirdstyles.net Feedback Score: 0 reviews	to the very best of my no-ledge machine work is nessecary to ensure a proper seal. If your doing this on any two-4-d we are taking at a minimum of a 6/7 year old car so I would recommend having block machined to spec for the pistons to be installed. We going high performance or stock? __________________ My project car... From dust you were born, And to the ashes you return ~ Kill Switch Engage Family Guy Quagmire: Hey, how old are you sweet thang? Connie: 16. Quagmire: 18? Alllll-right! Connie: Mommmm! Quagmire: I like where this is going, Giggidy giggidy gig-gi-dy!

12-15-2004, 02:39 PM	#3
Kreator Nissanaholic! Join Date: Mar 2002 Location: MD Age: 41 Posts: 1,975 Trader Rating: (0) Feedback Score: 0 reviews	stock, the idea was to just replace the rings.... how much machining would there be needed? Guess is the same as with a full rebuild right? __________________ кто болеет за Зенит, у того всегда стоит!

12-15-2004, 04:04 PM	#5
nightwalker Nissanaholic! Join Date: Mar 2003 Location: Bay area Age: 46 Posts: 2,146 Trader Rating: (0) Feedback Score: 0 reviews	probably no extreme machining, but a honing would be recommended. __________________ In life, we often cast the line of hope fishing for the best possible opportunity. Sometimes with enough effort, the things we catch are nothing short of amazing.

12-15-2004, 04:16 PM	#6
kandyflip445 Post Whore! Join Date: Sep 2002 Location: Arden, NC Age: 40 Posts: 4,460 Trader Rating: (1) Rides Gallery: kandyflip445 Feedback Score: 1 reviews	Honing. But I've taken apart cars with over 100k and they still have the original crosshatch. __________________ My 240 vBgarage

12-15-2004, 02:51 PM	#4
atom Zilvia FREAK! Join Date: Jan 2003 Location: San Francisco Posts: 1,196 Trader Rating: (0) Feedback Score: 0 reviews	If the gap checks out OK and the block is in good condition you'll be fine without machining the block.

12-15-2004, 05:26 PM	#7
RBS14 Nissanaholic! Join Date: Feb 2003 Location: Santa Cruz/San Diego Posts: 2,271 Trader Rating: (0) Feedback Score: 0 reviews	I highly recommend honing. You may be able to get away with just throwing new rings in but you are gonna kick yourself if they don't seal correctly because of too much gap and you have to do it again. Do it right the first time. __________________

12-15-2004, 05:32 PM	#8
zeek Zilvia Member Join Date: Oct 2004 Location: Texas Posts: 261 Trader Rating: (0) Feedback Score: 0 reviews	dont forget to correctly mis-align the rings 180 degrees off each other from the thrust angle of the piston skirt as well as the oil rings if you replaced those

12-15-2004, 08:09 PM	#10
zeek Zilvia Member Join Date: Oct 2004 Location: Texas Posts: 261 Trader Rating: (0) Feedback Score: 0 reviews	do you or dont you understand what i posted weirdstyles

12-15-2004, 09:51 PM	#11
ledzeppelin240 Zilvia Addict Join Date: Sep 2003 Location: Sinse Posts: 688 Trader Rating: (0) Feedback Score: 0 reviews	Ok for starter do not replace the piston rings with any other kind besides cast iron. They are the only ring that will make a seal in a bore that has not been machined. You should Hone the cylinder with a flex hone or a spring loaded one to break the glaze and give the cross hatch so that the oil has a channel to hold on to, this will provide proper lubrication. Lacquer thinner might remove the glaze as well. Double check that the rings fit the pistons correctly and that the ring lands are not worn. Also make sure they fit the cylinder correctly. Like said above ring gaps should all be offset 180degrees. Good luck... Chris __________________ Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power. Looking for: JDM S13 OEM Sideskirts

12-15-2004, 10:42 PM	#12
96twofourty Zilvia Junkie Join Date: Oct 2003 Location: nor*cal Posts: 354 Trader Rating: (0) Feedback Score: 0 reviews	I was reading this mustang mag a few years ago and they were building an engine and used a honing tool that they attached to the end of a drill. Dont know how accurate it would be but you need something __________________ Buy my stuff: http://www.zilvia.net/f/announcement.php?f=10

12-15-2004, 11:58 PM	#13
kandyflip445 Post Whore! Join Date: Sep 2002 Location: Arden, NC Age: 40 Posts: 4,460 Trader Rating: (1) Rides Gallery: kandyflip445 Feedback Score: 1 reviews	Accurate? It was either a ball hone or a 3 stone hone. Either one will work. __________________ My 240 vBgarage

12-16-2004, 07:40 AM	#14
Kreator Nissanaholic! Join Date: Mar 2002 Location: MD Age: 41 Posts: 1,975 Trader Rating: (0) Feedback Score: 0 reviews	thanks for the help guys. Thinking about it though, its probably cheaper timewise to find a used engine and swap that in instead of taking the engine apart and then most likely messing something up putting it back together. Probably will stick with that idea. __________________ кто болеет за Зенит, у того всегда стоит!