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Blow-by is an indication of worn rings. While the PCV valve can take up SOME of the blowby gasses, it can't take care of a lot, especially if you have severe blow-by. If you're still getting too much blow-by, it's time to rebuild the engine. Don't just do rings, have the cylinders bored and get new pistons, and while it's apart, replace the oil pump, have the Camshaft checked, replace lifters, polish and/or turn the crank, new bearings, new exhaust valves, replace or recondition all valve guides, and have the head surfaced. It's not very cost effective to just replace the part that has failed. Everything in the engine has worn severely over time, and you'll actually save in the long run if you do the engine right. BTW, don't ever let an engine overheat, that can lead to collapsed rings. Also, keep the oil and filter clean, and make sure the carburater is adjusted and working right and that the air cleaner is doing its job and is clean. Dust in the engine intake can cause rings to wear, resulting in blowby. In general, just make sure the NEXT engine is properly maintained and you shouldn't have blow-by problems.

2006-09-13 14:30:16
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Related Questions

How do you fix engine blowby?

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What do you mean by engine blowby in automobile section?

Blowby is a condition to where you have excessive pressure in the crankcase of an engine usually from worn piston rings. A faulty PCV system can also cause excessive engine blowby.


Blowby is caused mainly by?

Combustion pressure getting past the piston into the crankcase. Worn rings or failed piston are normal causes.


Can blow by be caused by a faulty turbo?

not really. You can get blowby in the turbo itself from high crankcase pressure, but a turbo won't cause engine blowby.


What is wrong if the place you put oil is smoking?

you are a couplke of years late in changing it regularly. It's called "blowby". When the piston rings wear down, combustion gasses leak between the piston and cylinder into the crankcase. Blowby is arguably one of the best indicators of engine maintenance. Old oil picks up small pieces of abrasive materials that wear down the cylinder walls over time.


Theoretical of blow-by in engine?

Some blowby is normal in all engines, this is the reason for the pcv system (positive crankcase ventilation). excessive blow by, is the cause of worn pistons and or piston rings. excessive blowby will alot of times show up in the air cleaner box as raw oil that the pcv system just could not handle. If indeed you do have excessive blowby it is a major internal engine failure. Again blowby is normal in all engines, but it should never be so excessive as to show smoke in the blow by


What is blowby in an Internal Combustion engine and what can happen if it increases above normal level?

Blowby is the result of the piston rings not sealing properly against the cylinder walls any more allowing exhaust gasses to enter the crank case. This results in reduced compression which translates into reduced performance and fuel economy. It also results in more frequent oil changes as it leads to increased oil contamination. Left unchecked it can further reduce overall engine life due to contamination of the oil. Repairing an engine with excessive blowby will generally require a complete rebuild along with machine work on the engine block.


How do you fix engine blowby coming from the valve covers on a Chevy 350?

The problem could be valve seals or excessive piston ring blowby. You could try changing the pcv valve on the valve cover and check the line going to the intake plate to make sure its not stopped up or the intake plate isn't stopped up. However, it most likely means that the piston rings are worn out are broken. Time for a engine rebuild. That is the only way to fix that problem.


Ford 300 motor has lots of blow by?

blowby is caused by broken and worn piston rings


What is compression blow by?

Compression blowby is air, fuel, and exhaust gasses slipping past the piston rings into the crankcase.


Why is there white smoke coming from the dipstick tube and the valve cover on a 89 ford F150 4.9L?

excessive blowby


Your distributor is leaking oil where can it be coming from because you've try to change the distributor but it still leaking?

This could also be caused by a clogged PCV system which is common on these cars especially the 7mge. Pull the oil fill cap with the engine running. If you have a lot of pressure comming out you probably have what is called "blowby". If you have much blowby it will push oil out of anyplace that doesn't have a positive seal, that could include the distributor shaft. If you have that much blowby, the rings are worn and the only option is to rebuild or replace the engnine.


Oil in the air filter on a 318 motor?

you are getting blowby from a bad pcv valve. this is in the hose that runs to your air cleaner. there is also a sponge or fiber filter there that probably needs changed too. worst case is your valve seals are shot and need replaced.


What would cause oil filter cap to pop off while driving?

blocked pcv or excessive piston blowby..


How do you troubleshoot excessive blow by on a cummins N-14 engine?

Check the inche of water with a blowby tester 12 inches is wore out


What has the author Graham Peter Bush written?

Graham Peter Bush has written: 'An investigation into piston ring blowby and its effect on biogas engines'


How do you replace rear seals on a350 Chevrolet engine?

Somehow separate the transmission and engine, whether you drop the transmission or lift the engine, it's up to you. Then pull the flywheel and use a seal puller to remove the old seal and use a seal installer to put in the new one. Then put the transmission and engine back together. However... Before doing that make sure you don't have "blowby". That's a condition that's caused when exhaust gas leaks past the pistons. If you have blowby the engine will build pressure inside the crankcase and the seals will NEVER last very long. Check for blowby by starting the engine then remove the oil fill cap. Then place a piece of paper over the hole. If the paper is blown from the opening, you have blowby. It's common among engines with high mileage and/or a poor history of oil change.


Whats wrong if a 1994 Chevrolet Cavalier wagon has exhaust coming from the rocker cover area?

Likely a stuck ring allowing blowby from the cylinder.


What does it mean when oil and black smoke comes out of muffler on lawn mower?

Many times it just means that the mower has been leaned over on it's side too far and oil has gotten into the breather. It will burn this off after a while. If it persists then you have an internal problem in the engine and are getting alot of blowby into the breather.


What can cause oil coming out of the crankcase vent tube on a 2006 dodge cummins diesel 3500?

Engine over full, diesel in the oil, excessive blowby.


Can a clogged catalytic converter cause oil blow by?

Maybe but more likely its the other way around. Oil blowby will ruin the converter quickly. Perhaps if the check engine light was on & the engine quickly replaced then the converter would still be good. A clogged cat will just rob performance & the engine might not start. The oxygen sensors abre probably ruined from the oil blowby too.


91 camaro has blowby 305 v8 no oil on plugs 8000 mills on engine?

try installing a new PCV valve and were the valve seals ever replaced?


What would make a 7.3 diesel ford 350 turbo air cooling hose blow off?

either it is loose or some blowby got in to the clamp and slipped it off


Is a vacuum in the engine block good?

some,enough to pull blowby out an recirculate it into the intake,to much and you implode seals and gaskets,causing oil leaks and pulling debris into the engine.


Why is there fuel in crankcase of 2003 rm 125?

dont start it without changing the oil. I would check to see if the carb needs cleaned .the needle and seat could be hung open with dirt or something. If so it can fill the motor with fuel.Did you leave the fuel on,off and reserve switch on for to long when not riding. well change oil then check for compression.the top end could be letting the fuel mixture blowby.