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What is the piston clearance

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Hello Hans,
Yes the piston to wall clearance is .002" - 0025". (.05mm - .06mm)Measure your piston about .390'' (10mm) from the bottom of the skirt 90* opposite the pin holes (front to back).

Posted on Mar 12, 2016


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Posted on Jan 02, 2017


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Ring end gaps for B&S 31P777 engine

If the engine the figures are required for is a re-ring using the original pistons it is important to check the amount of wear of the bore and of the piston groove clearance.

Once the ring gap is set to the minimum at an unworn part of the cylinder bore the gap should be rechecked at the most worn part and if the gap exceeds the maximum it indicates an excessively worn cylinder bore.
While this is not immediately detrimental it does mean the piston ring grooves will wear much more quickly and the job will have a shorter life and in some cases a high oil consumption can be worsened.

The piston ring groove clearance - side clearance between the ring and the piston should be 0.0015 inch maximum. It can be expected the top groove could be considerably worn and in that case new pistons would be beneficial or a Cord ring set.

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I had a broken timing belt and replaced the heads, valve stems, seals, gaskets and springs. how do I time the piston to valve clearance to prevent kissing.

you don't change the piston to valve clearance
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all the details for timing the valves are in the workshop manual as you have not bothered to include the make, model ,year and engine type in your post

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What is the piston to bore clearance on a 1984 Harley soft tail with wiseco pistons?

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On a rhino 660 2005 which timing mark do I use there is 3

engine cooling fan
timing plug
valve clearance Out of specification
Valve clearance (Cold)
Intake-0.10~0.15 mm
(0.0039~0.0059 in)
Exhaust -0.15~0.20 mm
(0.0059 ~0.0079 in)

a.Turn the crankshaft counterclockwise with awrench.b.Align the
" I"
mark on the rotor with the stationary pointer
on the A.C. magneto cover. When the

" I "

mark is aligned with the stationary pointer, the piston is at the Top Dead Center (T D C).

When the piston is at the Top Dead Center(TDC) on the compression stroke, thereshould be clearance between the valve stemtips and their respective rocker arm adjustingscrews.

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Valve adjustment shims for Mazda protege 2002 2.0 litter engine. Dual over head cams 16 valve. Was bored out .020 inches over? What size if it was over bored out?

Three sizes of pistons are available:
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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.

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Hope this Helps,

~00 Buck~

"Still living on the Right Side of Dirt..."

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excessive piston clearance.really needed bore job with oversized piston,not just honed and rings.measure piston to cylinder clearance,check spcifications and verify

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