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2G Looking at a lot of machine work. Need opinions.

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A Sharp

Proven Member
158
14
Nov 18, 2013
Platteville, Wisconsin
So I've posted a couple times already regarding this engine. I'm doing a stock-ish rebuild on a 7 bolt. I will list my findings and follow with pics. It's a bit ugly. There was clearly a dirty oil supply at some time that caused some bad damage. The engine has also been overheated a couple times.

HEAD:
  • Stock cams - journals fairly scratched up, but probably reusable (will need polishing)
  • Cam caps and journals - need some polishing
  • Warpage - off by about .0025 in some places. The head has already been decked 0.010 at some point.
  • Rockers - in good shape
SHORTBLOCK:
  • Crank - Pretty much every journal fails the fingernail test. It's just bad enough to barely catch my nail in most places. Endplay is about .004-.005 (in spec) and thrust surface looks beautiful. However, I noticed two tiny cracks in the bevels of two journal oil galleries. I took a pic of one of these.
  • Main/Rod Bearings. Lots of trenching and embedded particles.
  • Deck - warped by about .0025. I have no idea if it has been machined before.
  • Bores - still have most of their crosshatching, except where piston slap occurs. There is odd looking wear in #2. It looks like a hazy white ring that goes around the bore about half way up.
  • Pistons - No obvious damage. Rings look good. #2 is bad; the wrist pin is binding up. There is a lot of resistance when trying to rotate the piston on the rod. It is my guess that #2 got very hot. This may explain the odd bore wear mentioned above.
I do not have a micrometer or bore gauge, so measurements from those tools are not available at this time.

Pics below:
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I plan to:

  • Deck head and block by .005 each, use a nice fat head gasket afterwards, and do the oil port mod.
  • Bore cylinders .020 over. Get new nippon pistons and rings.
  • Crank - I have no idea what to do with this thing: cut, polish, or replace? I have heard cutting isn't actually that bad ;)
  • polish cams
  • Leave balance shafts in, 'cause Jacks lists some seemingly good reasons to keep them.


Any thoughts/comments on this are welcome. Also, could you guys throw some ballpark figures at me, in terms of what the cost of the machine work should be? I've seen people asking about the cost of machining before, but those threads are old now. Thanks.
 

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I've seen that white ring from the piston before. It was in a K series Honda motor that had seriously overheated. I think your speculation that it's from excess heat is spot on.

Thanks for the info.

These are the prices I've gotten from the local machine shops around here:
Deck head: $40
Deck Block: $75
Bore and hone Cyls: $120
Hot tank block: $60
Magnaflux crank: $20
Grind Crank:$150
Polish cams: $70

This is the shop where I plan to get most of the work done: http://www.perfengine.com/Pricing.html

I wouldn't mind hearing some opinions on these prices. I think they seem alright.

Thanks
 
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