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Old 02-18-2004, 05:10 PM
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jassz jassz is offline
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Join Date: Feb 2003
Location: British Columbia, Canada
Posts: 402
Quote:
Originally posted by leathermang
The dimensions listed above are for the size variations of pistons new....
The piston to bore clearance is more than that...
Nat, I thought you had a shop manual for the turbo engine (?)...
Piston clearance when new is supposed to be 0.043-0.063 with a wear limit of 0.12......
This is from page 03.8-316/1 F2
I wish I knew how to read the page numbers in these manuals....
there are three groups of piston sizes...
All the sleeves ( new bores) are supposed to be bored or honed out to fit the actual piston going into it..
Interesting, our manual does not have a 03.8 section. 03.4, then it goes to 05.4. This is the sheet we went by, and calculated the clearances ourselves. Sorry the headers are chopped off, I couldn't post the whole page- it was too big. It works out to 0.001in, just as psfred said. So that is for new? I went looking in Haynes after reading your post, and, ahem, I did find the piston to bore clearance, just as you described.

Yes, I know the cylinders will have to be honed to match the pistons, but how do I know (before I buy) that they aren't already too big? Maybe I'm not asking this clearly....
Attached Thumbnails
90.909-90.918 mm tolerance... are they serious??-pistons-cylinders.jpg  
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