Question about Nissan Sentra

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I rebuild my engine an it is smoking when running. I intall new pistons and rings. I think that the problem are the rings that have to be a size greater than standard (.25)?????? HOW TO FIX THIS PROBLEM? it is a nissan sentra, automatic 1.6 4cyl 1995

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First you should have check your engine block to see what wear it had before you buy new piston. that will determin what oversize piston and rings to used , will if it come to that , it areally waste of work done

Posted on Aug 04, 2010


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My Opel Corsa 1400 has done 201,300 km on the clock. Not realy using oil. Every now and then pushes a bunch of smoke through the exaust system when starting the engine.

On higher mileage engines the internal parts are very worn such as piston rings. This can allow small amounts of oil into the ignition chamber. This burns off as you run the engine.
If the amounts of smoke is small and not very often it is nothing too serious to worry about. If there is a lot of it and it regularly happens, the only way to fix the problem is to completely dismantle the engine and rebuild it with all new seals and gaskets, a full engine rebuild.

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Suzuki atv 350 1989 oil smokes bad before and after rebuild

Hello Lee,
Did a qualified professional do the work?
Is the smoke light grey or black? Light grey is usually oil.. black is over rich carburetor.
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Was a new piston and rings installed?, Was the cylinder bored and the correct new piston and rings installed?..
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I have overall h100 2.6 engine and put the new piston and and oil pump , when the engine idle it release white smoke all the time, i have tried to run the engine but still no luck.

It certainly sounds as though you've got an oil leak.

Did you replace the piston rings as well? If so, did you use the right size?

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Installed new piston rings and gas is getting inside oil

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It's time for an engine rebuild. Or you could get a reconditioned engine installed. All depends, if the car is in good condition and worth fixing. But it is a 15 year old car. Might be time to upgrade.

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Engine cranks but only way to keep it running is by giving it gas. also smokes

You should run a compression test on your cylinders first and go from there.

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unless you have an accurate manual your going to run into a few problems ,if you think it's a good project one way to learn how to rebuild a motor, if you want great results concider one from junk yard ,or parts store rebuilt,no matter what you do it's a big project best of luck . oh ya if smoke is little you more than likely run it longer if you think it's good enough.

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My mitsubishi canter 4d32 engine had all its 4 top compression rings broken ie one from each bore what can possibly cause that and what amount of smoke or mist should i expect from the breather after...

As an engine wears the ring lands on the pistons wear also. In addition to ring land wearing on the piston, the bore in the cylinder develops a wear pattern. Has the engine been rebuilt?
If the pistons have worn ring lands and were re-used it may allow the rings (new or old) to twist in the grooves and catch on any ridge in the cylinder, thus breaking them.

When the engine is apart you must check for proper ring land wear. You need to consult the piston manufacturer for proper wear specs, typically around 0.006in.

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