16
votes
Accepted
What's gonna happen if I disconnect 'single piston'
As you saw with your test, it is possible to disconnect the ignition on two pistons and still have the engine run.
The vibrations have nothing to do with engine knock or detonation though. The reason ...
- 39.2k
9
votes
3 rings vs 4 rings pistons: which design is better?
There are trade offs, so no clear answer here.
First of all, just to be anal and clear something up ... what you have is actually a 4-ring and a 5-ring piston. The oil control ring at the bottom ...
- 160k
5
votes
Accepted
Is it really necessary to resurface cylinder and substitute piston?
You can absolutely reuse the piston if it isn't damaged.
There are piston compressor tools dedicated to slide the piston back into the cylinder.
- 39.2k
5
votes
Accepted
Fourth piston isn't sparking so car is losing power
I am pretty sure the spark plug is broken but I am not sure
That's almost certainly the issue. Replace the spark plug and try again, if the problem is fixed, you're all set. If not, then there are ...
- 12.1k
4
votes
Accepted
1986 El Camino: deprecation
6 months won't have done much damage. It might be worth changing those tyres if it's been sat on them flat for months. It started so battery and fuel system are probably OK.
Sometimes brakes will ...
- 321
4
votes
Extracting piston rod's "wire" C clips
Those gudgeon pin clips are the fiddly type! .. Get a sharp engineers angled scribe or similar, and try to lever one end of the C-clip away from the piston just enough the get a small narrow blade ...
- 5,067
4
votes
Rebuilding an engine: pistons installed, crank rotation "very" stiff
I am concerned with you description of the oil ring - the ones I have fitted come in 3 parts : 2 scraper "flat" rings and a "top hat" mounted on its side that locates the other two. Fitted correctly ...
- 34.7k
3
votes
Accepted
piston damage impact
The piston will be fine - it is the rings that provide the seal with the bore. As long as the rings move freely side to side then it will seal as it should.
If the rings stick then that should be ...
- 34.7k
3
votes
Accepted
Can the bottom of a piston be scratched and not damage the cylinder?
I do not see anything that I would call a "scratch". A scratch would be into the piston ( below the surface ) so should not hurt an iron , steel , or even an aluminum cylinder wall. However , I see a ...
- 3,688
3
votes
Rebuilding an engine: pistons installed, crank rotation "very" stiff
Ok mystery solved: I have two piston sets, both are identical in look, dimensions and part numbers/marks...only that they are not :) I took the ones I installed and carefully checked measures and ...
- 3,346
3
votes
Accepted
How much should you clean dirty pistons and valves when you aren't removing them?
You can do as little or as much as you want, it is your engine.
Since you have already done a load of work disassembling the engine, to me it would make sense doing as much as you can while it is in ...
- 25.5k
3
votes
When switching off the engine, do the cam and crank shafts always come to rest in an initial state?
No. An engine stops where it stops because it is random when you turn the ignition off, and therefore there is no set place for it to end up at.
- 160k
2
votes
Accepted
Rebuilt engine started, but with strong clanking sounds
did a valve stick? when you take the valve cover off is there one that is stuck?
How did it seize up?
Is the sound a bang, a schlip, a ping, a clank. Is it sharp or long? Did you put all the conrod ...
- 2,879
2
votes
Do my new oil rings have an excessive gap?
if they are 30+ years old were they kept in oil or some other anti rust / corrosion preservative? if not make sure the rings are still good.
Are these gaps with the new cylinder sleeves? if so then ...
- 2,879
2
votes
piston damage impact
The foreign object damage to the piston means there is very likely similar damage to the bore . New rings can not fix that problem.
- 3,688
2
votes
3 rings vs 4 rings pistons: which design is better?
Use the piston from the "newer" design ie most recent - the engineers most likely made changes to reduce or avoid certain issues.
- 34.7k
2
votes
Pistons ordeal: more pistons problems; two issues in one question
My suggestion is to go with set #1 without any modification to the pins or adding anything to the pins. While the pins are a bit shorter than what comes stock, they should work fine. The difference of ...
- 160k
2
votes
Is it possible to repair a piston in an engine
In this case you are probably not going to cut it with replacing broken parts, your engine needs to be overhauled. The faulty piston must be replaced but the cilinder walls are likely to be damaged ...
- 1,350
2
votes
Can missing two oil changes cause piston rings to crack?
Probably not but if you are looking to make a warranty claim and you did not follow the recommended service intervals, then they can probably deny the claim as there is some relation to engine oil ...
- 12.1k
2
votes
Bought a damaged used 2SZ‑FE engine in Sweden. How to check if piston ring is damaged without using a borescope?
You've done the correct first check with a compression test which has shown that there is some problem. But there are multiple causes for low or uneven compression:
Damaged piston ring and/or ...
- 12.1k
2
votes
What effect would a hole out of the bore at the bottom be?
It really depends on how far down the piston travels in the bore as well as if this is the thrust side of the piston or not. If the piston skirt travels lower than where the chip is at, the only ...
- 160k
2
votes
Testing piston ring
Basically, no. You're going to lose fluid past the rings no matter what, plus, how are you going to measure this anyways? This isn't how you test your piston rings.
The way to test your piston rings ...
- 160k
2
votes
Testing piston rings by pouring isopropyl alcohol in cylinder chambers with heads off
Piston rings don’t seal perfectly due to the fact that they have a split in them, so there will be a tiny gap where alcohol will leak past.
When piston rings are fitted, the splits are placed 180 ...
- 25.5k
2
votes
Accepted
Piston Ring Replacement Checklist
You cannot "assume" you can use standard rings. If you want to do it right, you need to measure the cylinder bore to see if you can use them or if you should bore the cylinder. There is a ...
- 160k
1
vote
Accepted
How does enough oil remain after combustion to lubricate during exhaust stroke
Oil from the crankshaft rotation is thrown against the cylinder walls during engine operation. This is oil escaping from the rod bearing. When the piston comes down in the cylinder, the bottom rings (...
- 160k
1
vote
Accepted
How to clean up carbon
If you want to clean up the carbon from the top of the pistons, use carburetor cleaner applied to a cloth. Clean shop rags will work, but if not available, paper towels will do the job as well ... it ...
- 160k
1
vote
Is it possible to repair a piston in an engine
Replacing the single piston - essentially stripping the engine down and rebuilding it (replacing any damaged parts along the way) is probably possible.. but it's unlikely to be economically sensible.
...
- 10.3k
1
vote
Is it possible to repair a piston in an engine
The labour to remove the old engine and fit a new replacement or a secondhand replacement or to be able to strip and rebuild is the same...
What you then add is the time to sort and tune the ...
- 34.7k
1
vote
How are compression rings lubricated?
there are several ways that rings are lubricated for example in a two stroke its done by means of petrol /oil mix in certain 4 stroke engines you will find a jet which sprays oil onto the bore and ...
1
vote
How are compression rings lubricated?
The answer is that the scraper ring does not remove 100% of the oil, a VERY thin film is left on the surface which provides the lubrication necessary.
Some engines will score the walls, but others, ...
- 34.7k
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