TwinTurbo.NET: Nissan 300ZX forum - No offense, but what you describe sounds like the engine
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Subject No offense, but what you describe sounds like the engine
Posted by LitlElvis on April 04, 2021 at 11:43 AM
  This message has been viewed 89 times.
In Reply To Re: I view a $14K quote for the labor to rebuild a VG posted by DanielThomas on April 03, 2021 at 02:08 PM
Message needs a lot of help.

1) 2.2mm thick head gasket - I assume because either the block, heads, or both were excessively machined?

2) positive deck clearance +0.3mm - due to above?

3) loss of compression on an entire bank of cylinders - either the gasket surfaces are not flat or possibly the cylinder head bolt washer surfaces have caved in from using too small of washers.

4) spun rod bearings on #2, 3, 4, and 5 300 miles after rebuild - are you replacing these rods or refurbishing?

5) scored cylinder walls from bearing debris - from your description, it sounds like you ball-honed these cylinders while half of the engine was still assembled ("I have a cometic still on the other cylinder bank and its holding well with good compression.")?

6) turbos die after replacing the head gasket for #3 above.

7) balance out - due to necessary crankshaft and rod replacement from spun bearings.

Personally, I wouldn't put one more new part on the engine or pay for any more machine work until it was disassembled 100% and inspected entirely. I would also find another set of VTCs to install because the ones you have now are likely contaminated with bearing debris.

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