Reply With QuoteMine have 0.040" stamped on them. Sorry I didn't take photos after I'd scraped the top surface clean. I assume this means they are 40 thou oversize. Thats not to say all oversize pistons are stamped with their relative size, but it is likely so.
Hi all,
The head came off the 2.25 petrol engine yesterday. I was surprised at how good it all looked, actually.
My question relates to the markings on the top of the pistons. Specifically, I am trying to ascertain whether or not I have original or oversized ones in there.
Each piston is numbered 1 through 4 (and that corresponds with their location)
Each one has a circle in the centre with a P (or what looks like a P) inside the circle.
Each one has an arrow pointing towards the front of the engine.
No 1 and No 4 have an A stamped on them. 2 & 3 have a B
Are these original?
Thanks in advance for any info (pics would be good as a part of your explanation if you have them).
John
TopicToaster
Mine have 0.040" stamped on them. Sorry I didn't take photos after I'd scraped the top surface clean. I assume this means they are 40 thou oversize. Thats not to say all oversize pistons are stamped with their relative size, but it is likely so.
Thanks Mark
Under closer examination what looked like an arrow is actually an X
I am starting to assume that oversize markings would be as visible as the other markings.
Wizard
SupporterYes, I would expect that they should be visible. Mine have "040" stamped on them very clearly.
RoverLord
that engines been apart before and had the orginal guts put back in.
1-4 for the pot number x for which side to the front.
a+B Im not sure.
OEM oversize pistons have the oversize in thou marked on them.
Dave
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Thanks guys
Dave, what tells you it's been apart before? Just wondering - or, rather, trying to see what I have missed.
One thing I didn't mention is that it is all carboned up in there - but under the carbon it looks great.
Piston sizing:
"Z" Nominal to minus .0002in
"A" Nominal to plus .0002in
"B" .0002in to .0004in above normal
"C" .0004in to .0006in above normal
"D" .0006in to .0008in above normal
ah - thanks - so 2 & 3 are 2 to 4 thou oversize.
Not necessarily "oversize", as such. (according to the manual.)Originally Posted by drifter
Still original pistons, just some slightly slightly bigger to take up discrepancies in the block when new, or when re-built in a near to new / low km condition.
TopicToaster
Piston do not normally come with their corresponding cylinder number marked on them, when new they can go in any cylinder of the appropriate size. Therefore if yours are marked 1 to 4 it is becasue someone was going to take the engine apart and wanted to ensure that the pistons went back into their corresponding bore.
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