 2.0 Crankshaft Measurments, Lapping Diameter?? |
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| pilothyer |
 Mar 16 2015, 12:10 AM
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#1
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Member  Group: Members Posts: 838 Joined: 21-May 08 From: N. Alabama Member No.: 9,080 Region Association: South East States  |
I am looking at the Porsche 914 Factory Manual Volume 1 (914-4 Engine & Clutch) On page 6.3-2/2 There is a chart on reconditioning of crankshaft which gives the crank pin diameters for the mains and the conrods. The first on the list is a new or normal main bearing pin which has a rated diameter of 60 mm, then it shows a measurement called lapping diameter one being 59.990 mm the other 59.971 mm.
I would like to know what the lapping diameter is, what is meant by "lapping dia." ? |
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Replies(1 - 5)
| sixnotfour |
Mar 16 2015, 09:35 AM
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#2
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914 Wizard Group: Members Posts: 10,432 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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lapping = polish
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| r_towle |
Mar 16 2015, 12:10 PM
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#3
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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QUOTE(sixnotfour @ Mar 16 2015, 11:35 AM)  lapping = polish licking if you are a dog.... Polished dimension, agreed. |
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| pilothyer |
Mar 16 2015, 12:46 PM
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#4
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Member Group: Members Posts: 838 Joined: 21-May 08 From: N. Alabama Member No.: 9,080 Region Association: South East States |
Thanks for the responses, Can I assume then that as long as the polished dimension is between 59.971 mm and 59.990 mm I would be good to go with standard main bearings?
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| rgalla9146 |
Mar 16 2015, 08:10 PM
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#5
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Advanced Member Group: Members Posts: 4,554 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None
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Yes
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| pilothyer |
Mar 17 2015, 08:42 AM
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#6
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Member Group: Members Posts: 838 Joined: 21-May 08 From: N. Alabama Member No.: 9,080 Region Association: South East States |
Thanks (IMG:style_emoticons/default/smile.gif)
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