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Smoking on acceleration after overrun

Engine has fully reco cyl head, oiling up No 4 cyl Had No 4 piston and rings out, all ok, Rings not worn, end gap within tolerances Great Comp 160 psi all cyls. After reassembly still smoking on acceleration after overrun. Has any body got any clues as to why P.s. problem started suddenly

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  • Cars & Trucks Master
  • 5,252 Answers

Maybe a leak-down test on number 4 could find it. Cylinder wall wear, maybe?
At least you got a good head if you have to rebuild the engine, that is, if worse comes to worse.

Posted on Jul 11, 2013

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Posted on Jan 02, 2017

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SOURCE: piston ring installation on 96 geo 1.3 liter 4 cyl engine.

If you are that deep into things you will do poorly without a good manual. Are the pistons new or used?If they are used you need to completly clean the ring grooves in the pistons or the new rings will stick and gall.Did you remove the ridge at the top of the cylinders? If not there is a good the top ring will either break or bust the upper land off of the piston. Hopefully you had a machine shop go through the block. Check the ring manufacture's web site. I am sure they will have tips and instructions.

Posted on Nov 29, 2008

  • 6 Answers

SOURCE: Smoking engine when first started V-10 gasoline.

well if it is only smoking when you first start it and it clears up after the engine warms up the first thing you need to check is your coolant level could be head gaskets

Posted on Apr 13, 2009

  • 109 Answers

SOURCE: what are piston rings

You didnt say what eng you have, 2.7l, 32.l, 3.5l, all these eng have resin plastic style valve covers, if it leaking oil out of eng from valve cover gasket , wich is silicone rubber, onto exhaust manifold, it will smoke some fair amount, possible cracked valve cover also, there is also PCV hose fitting on that side to from rear top of cover, inspect that to, has for the no 5 cyl tappet, is it noisey, if so they are replacable in assembly, depending on eng size, has for rings these engines are pretty tough in that area, in all my years on the bench, I have maybe done 4-5 rings replacments on these engines only because of severe eng over heating. and they will smoke out of the tail pipe only. GOOD LUCK RDJRP

Posted on Aug 08, 2009

  • 905 Answers

SOURCE: 2000 camry. blown head gasket (daughter drove car

Yes, you can, but not exactly recommended. If you are going to go that deep into it, then might as well do everything else. However, being unemployed tends to have a negative impact on the wallet....

I suspect it is more than just rings. I think that the walls have been scored badly as well. You may be able to use a borescope to take a peak into the cylinder through spark plug hole. Move the piston to bottom of stroke, and see what you can see. If scarred, much work will be needed. If hatches look alright, then you might be able to get away with just rings.

What kind of compression are you getting on #1 vs #2? This also might be a blown headgasket into an oil passage, or the head (perhaps block?) is ever so slightly warped in this area.

Posted on Aug 29, 2009

Testimonial: "Thanks for the quick response. Very much appreciated your input, all makes sense and got my mind on the right track again. Thanks"

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SOURCE: newly overhauled toyota corolla 2e engine emits black smoke

I have toyota corona 3s engine it smokes black and fuel consuption is high we have changed the engine oil and cylinderhead gassecate but still black smoke is comming what should i do

Posted on Mar 29, 2010

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