Question about Mazda MPV
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Posted on Jan 02, 2017
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
Which Piston Ring Gap? First of all you need to purchase a Hayne's Manual for your car. It will give you the specifications under the Engine section of the book. The piston has three rings on it. From the top you have your first compression ring, then your second compression ring (these "clearance" specifications or "gap"), should be the same as measured on the piston insofar as the clearance between the "lands and grooves" or between the ring and the piston groove. The third ring is your oil control ring which will have a different clearance between (for example), the top of the ring installed and the piston's groove. Then lastly, you need to place the compression rings and place them in the bore of the cylinder WITHOUT being installed on the piston. A measurement is then taken between the opening gap of the ring while in the block. To make sure it's lined up properly, invert a non-ringed piston down into the bore from the top to make sure the ring is installed at the same depth all the way around.
If you don't want to buy the Hayne's Manual, just stop by your local Dealership and get the Specifications for the two compression rings, the oil ring and the "installed" clearance or gap on the rings.
Hope this Helps,
"Still living on the Right Side of Dirt..."
Posted on May 18, 2010
SOURCE: what is the piston ring
The end gap is derived from the bore size. For the 2.91" (74mm) Geo 3 cyl bore, the top ring end gap is .004" divided by bore, so that is 2.91" / .004 = .012". The second ring and oil ring should be bore divided by .005", so that is 2.91" / .005 = .015". Don't file the springy part of the oil ring, as it is designed to compress and fit snuggly; just file the top and bottom ring that sandwich the springy part.
Posted on Dec 14, 2010
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