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964 C4 light refurb

 
Old 08-01-2017, 06:35 AM
  #796  
John McM
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Cams timed. It took a lot longer than I thought as I failed to position the cams in the correct position as the markings were indistinct.

Cam bolts torqued to 110 Nm. The other nuts were 10 Nm.
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Old 08-01-2017, 06:44 AM
  #797  
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Followers/tappets installed on one side. An interesting point I picked up from Wayne's book is that the flange thickness is different depending on the position. As the follower shaft is shorter than the total width you change the depth of the shaft depending on the flange width.
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Old 08-01-2017, 01:19 PM
  #798  
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Great stuff...

What you observed answered much of my question on rocker installation... I was watching a yt video of an older engine being assembled and he mentioned that each rocker shaft should be centered to rocker and not aligned based on the edge of casing...

I will have to check my cam pics, but I am not sure I had all those punch marks on end of cam, think I only had one per cam ...
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Old 08-01-2017, 06:02 PM
  #799  
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You've got it but I'll add a few more pics.

The rockers are done in sequence, 1,2,3 & 4,5,6.

The rocker shafts are inserted without the bolts and nuts.

The rocker shafts are inserted at a depth that ensures they are centred on the opening. This means that their position relative to the flanges differs. If you put them all next to the flange edge some will be off centre.

The bolts and nuts are inserted after the follower and shaft are positioned. The bolt and nuts are torqued to 20Nm. Always tighten with the small hex nut.
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Old 08-01-2017, 09:37 PM
  #800  
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Check, Checkmate! Hope all the noobies like me are paying attention

For your cam timing, spreader and 1.26mm ? How were your cam settings before disassembly?
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Old 08-01-2017, 09:52 PM
  #801  
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Cam settings were perfect prior to disassembly. In hindsight I should have marked the cam tops at that stage as I knew it was right. My left cam has a clear white dot which I failed to put exactly at the top. The right cam has no similar dot. By the time you get to timing, the cams are nicely sealed. I didn't want to reverse that and pull them out. Lesson learned.
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Old 08-01-2017, 10:52 PM
  #802  
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Pic of incorrect follower shaft position.
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Old 08-01-2017, 10:55 PM
  #803  
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Chain timing cover. So many places to leak.

Lots of Dow 111 should sort it out. 6Nm of torque on the nuts. A good squeeze out gives me confidence I've done the best I could to avoid leaks.
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Last edited by John McM; 08-01-2017 at 11:45 PM.
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Old 08-02-2017, 08:18 AM
  #804  
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1-6-2-4-3-5 is etched in my brain. Valves adjusted, power steering pump fitted and right hand timing chain cover fitted.
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Old 08-03-2017, 04:45 PM
  #805  
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Power steering pump covers on
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Old 08-03-2017, 04:49 PM
  #806  
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Large oil line connected and heat exchangers on. Copper grease and all new fasteners. NB: I decided not to take a grinder to the joint between the right and left exchangers as the unit comes off easily as a whole.
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Old 08-03-2017, 04:53 PM
  #807  
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Engine shroud in place. Intake gaskets coated with Dow 111 and fitted.
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Old 08-06-2017, 04:05 PM
  #808  
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Time for a break from engine building and actually have a drive.

I spent last weekend with up to seven other Porsches, and we ripped through 900km of NZ's great back roads. The Silver C4 was faultless. Next weekend we fly back to where we left the cars and will do another 1,100km. Life is good.
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Old 08-07-2017, 07:42 AM
  #809  
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Back to engine building. Fuel injectors and rails fitted. Intake plenums cleaned and fitted. Distributors fitted and ignition wires routed.
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Old 08-07-2017, 08:08 AM
  #810  
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A short video of the roads we drove last weekend. Not my footage as my Go Pro had incorrect settings.
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