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Engine losing compression, query piston rings need replacing, how do I do it, please?

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Please indicate what exactly this is, year and model and verify make and where made. Thanks

Posted on May 28, 2011


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Motorcycle is losing compression and noisy

if it is a water cooled engine the ring gap at the bottom of the cylinder should be around .010"
rings have to be installed the correct way up or the compression doesn't help push the rings against the cylinder walls for effective seal
piston skirts will touch the cylinder walls as the pressure pushes the piston to one side as it pushes the piston back down the cylinder
I have to ask did you put an old piston back in the new cylinder
was the new cylinder standard size or over size
what was the ring gap before you fitted them to the piston
did you use new rings or the old ones --maximum rin gap is .025"
rings don't wear in , just wear out
why did you replace the cylinder in the first place
was it because of low compression or taper wear
as silly as all this seams it is all very relevant to your question

Mar 11, 2016 | 2011 kawasaki KLX 250

1 Answer

Too much engine oil consumed

Please take a second opinion to confirm . Now if the perrformance of the bike engine is poor, low fuel efficiency , poor torque and poor start specially when it is cold then you need to check the COMPRESSION of the cylinder and ONLY if this is low should you need to replace. Also if there is heavy smoking or use of engine oil then the oil rings can be faulty.

Nov 15, 2011 | Motorcycles

2 Answers

Number 1 Cylinder loses Compression

That means u have to replace the piston ring on that piston in the #1 cylinder or check the intake/exhaust valve, it might have problem in sealing the cylinder during compression! If you have done the compression test, those are the main problem of loose compression. The only way to check it is to remove the cylinder head.
Hope that might helps u out!

Jun 11, 2011 | Nissan Frontier Cars & Trucks

1 Answer

Mechanic says that my timing chain needs replacing - but states the pistons may be bad also -- is this true

940 engines run on timing belt. Replacement is needed as per recommendation in the manual. Your are able to check if pistons compression rings and oil rings are bad by carrying compression test, pulling out the oil dipstick while engine is idling and vapour is is noticeable coming out and opening the engine oil filler cap after stopping the engine, vapour is observed then you may have problems with these rings.

Nov 02, 2010 | 1994 Volvo 940

3 Answers

Air blowing out of oil cap on ford escort

Check PCV valve by pulling out of valve cover with hose attached. Start engine and verify the valve is sucking air. If yes, your piston rings are worn out and allowing combustion gasses into the crankcase. This is too much for the PCV system to handle. Recommend checking compression on all cylinders--may be just one piston. Let us know if you have more questions.

Sep 22, 2010 | 1997 Ford Escort

2 Answers

1990 318i engine no compression yet timing chain ok cam and lifters working pistons going up and down has spark 0 compression wont start

I suggest you bring the pistons to TDC, one at time on the comprssion stroke and do a "cylinder leakage test". Put compressed air into the spark plug hose and try to detect where the air is going. If you have the piston exactly at TDC, it will stay there when you put conpressed air in the hole, if it's off a little it will push the piston down. If you have the valve cover off you can watch the valves to determine if you have the pistons on the compression stroke. You should be able to buy a fitting from an auto parts store that will thread into the spark plug hole. If not take an old spark plug and bust the guts out of it and weld a pipe fitting to it to adapt your air compressor hose.

Mar 07, 2010 | 1996 BMW 318

2 Answers

Intermittent white smoke out exhaust and engine misfire

The piston rings in your engine might be needed to be replaced already... go to a local shop with a compression tester.. have your engine tested for compression leaks.. if it does have compression leaks.. then you need to change piston rings. Note** white smokes = engine is burning oil..

Jun 25, 2009 | 1998 Pontiac Bonneville

2 Answers

2004 chev trailblazer #6 piston losing compression - replace?

Get a second opinion from a independent shop that sounds way to high.

Jun 18, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

What is reason for engine oil coming out of exhasut manifold

You are asking good questions, first the oil, I presume your vehicle is of high mileage? and possibly had a hard life with maybe late service intervals?
There are a few possibilities oil is being burned, first and this relates to your last question (Back compression) is worn compression piston rings, the compression of the combustion seeps past these and sends pressure through the oil scraper rings (Last set on the piston) increasing crankcase pressure which in turn forces a film of oil out of your breather pipe, the outlet is usually located on the air filter so it is drawn into the cylinders and is burned causing poor ignition and smoke from the rear.
Second and possibly combined is valve guide wear, the valves allow oil through their worn stems and seals causing a smoke haze, this usually clears a lot when engine reaches operating temp.
I hope this epic has clarified your query? please press the Blue Button for my Free! effort.
Thank You!
Paul 'W' U.K.

Feb 21, 2009 | 1997 Mitsubishi Galant

4 Answers

2001 Toyota Corolla, Burning Oil rapidly

Take your vehicle back to your mechanic, and have him perform a DRY, then a WET compression test. Please provide both readings back to me. In the meantime, ask him what it would cost you to him replace the piston rings. This is your problem. The 2 tests will simply verify me thinking.

Oct 01, 2008 | 2001 Toyota Corolla

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