_bilby64_
Posted 29 September 2016 - 12:03 AM
Hi all,
I have been given a 186 engine and have pulled it down.
5 pistons have a part number 7429479, this number is on the inside of the piston.
1 piston has RAZ202Z 040 10P 01 QE, these numbers are on top of the piston.
Are the 5 pistons equivalent to a 202 piston 4 thou over.
Is anyone able to help?
Thanx,
Bill.
Piston 1.jpg 33.98K
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Piston 2.JPG 39.31K
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Do I feel lucky? Well, do ya, punk?
Posted 29 September 2016 - 12:12 AM
40 thou over
Scrivet Counter
Posted 29 September 2016 - 12:58 AM
RA2027 040 T0P 001 CE
_bilby64_
Posted 29 September 2016 - 01:23 AM
Forum Fixture
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Posted 29 September 2016 - 06:48 AM
Should be .040" over for all pistons, unless someone has done a dodgy job. Clean the tops of the other pistons to see.
Oh My, Don't you post alot
Posted 29 September 2016 - 08:30 AM
Bill
It looks to me like someone has replaced a busted 186 piston with a 40 thou over 186 piston as a cheap job.
202 and 186 use an identical bore but 202 has a longer stroke with the same rod length hence the pistons are not interchangeable. Every other Holden red-blue-black 6 from 130ci to 186ci shared the same stroke and used a bigger bore but 202 is the only one where the stroke was increased. So for example a 179 is a 173 +0.0625" (or 1/16") bore, a 186 is a 179 +0.0625" bore.
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