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1990 964 C4 CAB

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Old 03-10-2024, 03:34 PM
  #166  
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final rinse

much smoother

ready for final tumble burnishing
Old 03-14-2024, 06:53 PM
  #167  
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Power steering belt cover after tumble burnishing
Old 03-14-2024, 06:54 PM
  #168  
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Fan
Old 03-14-2024, 06:55 PM
  #169  
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Lower cover looks new
Old 03-14-2024, 06:56 PM
  #170  
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Alt cover

Inside
Old 03-14-2024, 06:58 PM
  #171  
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This came out nice

Flip side
Old 03-15-2024, 02:45 AM
  #172  
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Oil pump torn down for inspection

Degreased

Gears

Other side

Further disassembly shows it to be in good shape
Old 03-15-2024, 02:15 PM
  #173  
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Oil Pump rebuild


Clean parts

Correct info

Shafts in housing

gears

complete unit

loctite, and torque

8 NM

kept shooting a tiny bit over, but on second pull was at 8.12 NM

snap ring
Old 03-15-2024, 05:19 PM
  #174  
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carbon build up on edges

edge taken off

surfaces scraped

initial clean, to the tumbler next
Old 03-15-2024, 05:22 PM
  #175  
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Time to degrease the crank

degreased

flywheel side

chain side

this was a devil to remove
Old 03-15-2024, 05:24 PM
  #176  
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finger puller

purchase

off
Old 03-15-2024, 05:29 PM
  #177  
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Love this tool to aid in proper stretching

engraved on two arms

scratches

and some more
Old 03-16-2024, 12:17 PM
  #178  
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So changing up plans and going to a 3.8RSR build with 993SS cams. There are faint scratches on a few journals on the crankshaft. After some reading there appears to be a few schools of thought. Firstly serious engine builders realize that the oil thickness between these surfaces is .00005" so any tiny deviation is an issue. Others just throw it back in and pray as they "have done it for 25 years and never had an issue" I have a few crankshaft specialists in my area that deal with micro-polishing, or even 1st undersize. Some of these cranks are going for 5-10k. Any advice would be appreciated.

Last edited by penna964; 03-16-2024 at 04:08 PM.
Old 03-16-2024, 04:29 PM
  #179  
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Cylinders and pistons...


3.8 RSR' conversion

comes with all I need
Old 03-16-2024, 04:33 PM
  #180  
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cams


cams


Quick Reply: 1990 964 C4 CAB



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