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Rebuild:Bore/Journal Measurements Necessary? (Read 855 times)
OK-944
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Rebuild:Bore/Journal Measurements Necessary?
Mar 31st, 2020 at 7:12pm
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1987 NA, engine is apart and I’m within a couple of weeks of starting the rebuild process.

Purchased this car a year ago with 170K, have all records back to day one, (evidently extremely well kept and maintained), and I burned less than 1/2 qt. of oil over the 5K that I drove it last summer and fall.

To cut to the chase, the engine internals look great…with absolutely smooth cylinder walls, bearing journal surfaces, etc., and just a bit of wear on some (but not all) bearing shell surfaces.

So my question, not owning a decent set of measuring gauges, is this: can I get away with simply checking bearing clearances with plastigauge and piston ring gaps with a feeler gauge - or should I invest in a decent set of measuring gauges and pre-measure everything first?

Finally (and not wanting to sound cheap), can anyone recommend a truly decent (and appropriate for this engine) set of measuring gauges, that won’t break the bank?  I would eventually like to own such a set in any case. Thanks! 
  
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OhioTom
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Re: Rebuild:Bore/Journal Measurements Necessary?
Reply #1 - Apr 2nd, 2020 at 8:12pm
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Rod bearings, you can just install them if the crank looks good. They usually do look good and are fine.

Cyls, yes gap the rings with feeler gages.


Summit Racing sells a 3-set of OD mikes. They are Mitutoyo copies. Measure in "tenths" and come with 1" and 2" standard (that is within 50 millioniths of an inch). I checked them at my work and they are spot on. 0-1; 1-2;2-3 sizes.

$50 for the set.

Keep them in a temp controlled environment for greatest accuracy.

I don't think you need them. but they are nice to have to confirm things.

  

Tom Simpson&&VW/Porsche freak.
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Re: Rebuild:Bore/Journal Measurements Necessary?
Reply #2 - Apr 2nd, 2020 at 11:50pm
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Tom...I cannot find these on the Summit website.  Could you possible give me a product name or tag number?  Thanks!
  
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Re: Rebuild:Bore/Journal Measurements Necessary?
Reply #3 - Apr 3rd, 2020 at 12:06am
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ps...I just found a set by Jegs - sound like what you've described, for 50.00.
  
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OhioTom
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Re: Rebuild:Bore/Journal Measurements Necessary?
Reply #4 - Apr 3rd, 2020 at 2:23pm
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They come in a nice wood box.

For $50, I have been more than happy with them. I build alot of race motors too.

Luckily, I work at a machine shop so it was easy for me to bring them in and check the accuracy by our ISO guy.
  

Tom Simpson&&VW/Porsche freak.
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Re: Rebuild:Bore/Journal Measurements Necessary?
Reply #5 - Apr 3rd, 2020 at 9:55pm
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Tom...could you give me some kind of name and/or identification number for that set?  Thanks!
  
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OhioTom
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Re: Rebuild:Bore/Journal Measurements Necessary?
Reply #6 - Apr 6th, 2020 at 3:58pm
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Summit Racing® Outside Micrometer Sets SUM-900014
  

Tom Simpson&&VW/Porsche freak.
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Re: Rebuild:Bore/Journal Measurements Necessary?
Reply #7 - Apr 6th, 2020 at 7:09pm
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Thanks!
  
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