14 votes
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Will boring a cylinder affect its longevity thereafter?

Over boring the cylinder is a process to ensure the wall of the cylinder is pristine, providing a sealing surface for the rings to mate. Often when an engine gets old and tired, there will become ...
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13 votes

Why is a W-16 called, well, W?

I think I know If you want citations, I have already failed you. You Asked Was there any reason someone (possibly the Volkswagen group) decided to call this configuration a W-16? Answer Maybe. ...
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  • 32.8k
12 votes
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Why is a W-16 called, well, W?

I'm by no means an expert, but found an interesting article on Wikipedia about the W engine that indicates the W being a relatively recent addition to the automotive world, but not the aircraft/...
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  • 289
10 votes

Cylinder leak down test to detect oil leakage

You can do a leak down test but look at your spark plugs first If your burning oil you will see it on your spark plugs. They will be black and have buildup on them. If you find one or two that look ...
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7 votes
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Can i Use The Same Old Bolts On The Same Cylinder Head?

Your Passat uses torque to yield bolts, so they must be replaced. The torque to yield bolts are considered "one and done". This is because during the torquing process, they are stretched beyond ...
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7 votes

Cylinder leak down test to detect oil leakage

Not a desired answer, but with no leaks (to ground or into coolant) it's possible that your engine is just using/burning what some manufacturers would consider a normal amount of oil: How much is ...
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  • 678
7 votes

Cylinder leak down test to detect oil leakage

I'm wondering if you are having an issue with oil bypass, as in going through the breather/PCV and ending up getting burned through the intake. A simple catch can would prove this out for you. This ...
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7 votes
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Small crack/gap between cylinders on block

It's completely normal, nothing to worry about It's simply the gap between the sleeves. If you look from above, straight down, you will see a straight edge cut into the outside diameter of the metal ...
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6 votes

Cleaning pistons and cylinders with oven cleaner

Why chance it when some carb cleaner will do the trick for you. It should take carbon off of the piston without any worry of damage to the piston. Use an old, broken piston ring to clean out the ring ...
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5 votes
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Side effects of small amount dirt from spark plug well

tl dr; I'm sure minimal damage (if any) would occur from this, but there really is no telling. A small amount of dirt would usually not cause an issue. It also depends on the size of the dirt. Most "...
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5 votes

Afraid to crank engine - how can I tell if my cylinders are flooded with water?

Given that there are no sensors inside the cylinders, I can't think of any way of doing so, other than Mauro's suggestion of removing the plugs and turning it over, which would spurt out any water in ...
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5 votes
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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.
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  • 39k
4 votes

Are wet cylinder liners' shims utterly neccessary?

Use a caliper gauge and measure the height of the new liners with the old ones and also the thickness of the shims from the old liner. I would measure the new vs old liners. You may have needed to ...
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  • 2,859
4 votes
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Afraid to crank engine - how can I tell if my cylinders are flooded with water?

If it is just condensation you are worried about, then I wouldn't worry. Water is produced normally by the combustion process. I would be more worried about water in the inlet tracts waiting to be ...
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4 votes

How bad is 30% cylinder leak?

"put my hand on the exhaust pipe and there was maybe a very low flow." You have found your problem, there should be 0 flow.
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  • 7,940
4 votes

Cylinder misfire after leak down test

You don't say why you needed a leakdown test in the first place. If you rotated the engine by hand in the opposite direction that it normally runs and it has a timing belt then it is possible that the ...
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4 votes

Pros and cons of driving a vehicle with a misfiring cylinder

I can relate a story from my own experience with my daughter's car. Turns out it had two bad ignition coils that caused the engine to misfire when it was raining. Did she stop when the check engine ...
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  • 8,829
4 votes
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Can clutch fluid be low for any reason other than a leak?

Clutch fluid doesn't go anywhere the only reason to get your fluid level go down is a leak. However if you drained the system for some reason (parts replacement or whatever) there might be air trapped ...
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  • 1,177
3 votes
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Stuck valve, loss of pressure. Risky or only poor performance?

The longer you run it, the more damage you are going to cause. This will incur more cost when you do go to get it fixed due to the parts involved. Depending on which valve(s) is (are) sticking, you ...
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3 votes

Cleaning pistons and cylinders with oven cleaner

Dude spend the extra 3 bucks and buy a proper engine cleaner. Spraying sodium hydroxide on aluminum is a bad idea. I would use a nylon brush drill bit to clean off carbon. Although it's ...
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  • 1,925
3 votes

Can i Use The Same Old Bolts On The Same Cylinder Head?

Replace the bolts, this has been covered in detail on this site : here is one such post with lots of detail : "Always Replace" (torque-to-yield) Bolts
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  • 34.4k
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 ...
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2 votes

Check engine light mysteriously turned off

If the AutoZone person cleared the codes, the light won't come back on. Usually, when a CEL occurs, I'll clear the codes and see if they come back. If they don't come back, then I'm wary of the item, ...
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2 votes

Will boring a cylinder affect its longevity thereafter?

technically yes. You can only bore them out so many times before they will need to be replaced. Each time you bore it you can usually expect it to last just as long as it did last time. Once it is ...
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  • 2,859
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 ...
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2 votes

What does radiator water in the cylinder well indicate?

Does coolant fluid in the cylinder well indicate gasket failure again? Indeed it does! Or it may also mean that the original problem was not actually a head gasket. The next likely causes are ...
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  • 8,829
2 votes

What is typically involved to repair a internal combustion engine that has a cylinder misfiring?

There are many reasons for a cylinder misfire, many of them you can check for yourself. Easy to check are: Spark plugs: a worn plug, badly gapped plug or a fouled plug Spark plug not fully in: check ...
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  • 14.5k
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 ...
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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, ...
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  • 34.4k
1 vote

Drove with radiator cap not tight all theway

It pretty much depends on how much you drove this way. If there is less coolant the car will heat up the remaining coolant a lot quicker, and once it reaches a hot enough temperature, most modern cars ...
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