I am going to be dissasembling the engine for the first time to give to the machine shop. Is there anything that I need to be aware of. I know that i have to keep the bearings, etc with each piston and keep track of the positioning of the rocker arm bolts. All of the head bolts are going to be new but you have to loosen in a pattern. Any other don'ts. I am going to read through the haynes but I thought that I would ask.
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If you have over 150k miles on that motor, then you can almost bet that you're gonna need to regrind the crank and find oversize bearings.
My motor had 176k and needed it.1987 300ZX Turbo - http://www.z31performance.com/forum/vie ... php?t=3114
2001 Tiburon Turbo 60-1 270whp/268tq
No cupholders? Where am I gonna put my beer????
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Evil Z31 wrote: If you have over 150k miles on that motor, then you can almost bet that you're gonna need to regrind the crank and find oversize bearings.
My motor had 176k and needed it.Chuck Stong
300+ Parts and Performance owner
http://www.300-plus.com
2002 ZCOT president and always active member
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[quote]Firehawk wrote:Originally posted by Evil Z31If you have over 150k miles on that motor, then you can almost bet that you're gonna need to regrind the crank and find oversize bearings.
My motor had 176k and needed it.
Can't go by miles. I have seen cranks that were 200k and perfect, 90k and needed polishing.My beloved Z:1987 2+2 NA2T w/30a swap.
My black sheep: 88ss parts car (pretty much stripped and gone)
207k miles and counting. Turbo'd since 155k.
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[quote]Firehawk wrote:Originally posted by Evil Z31If you have over 150k miles on that motor, then you can almost bet that you're gonna need to regrind the crank and find oversize bearings.
My motor had 176k and needed it.
Can't go by miles. I have seen cranks that were 200k and perfect, 90k and needed polishing.
I've never had a vg30 crank that needed grinding, but it seems all of the stock engines I have had were pretty well cared for... until I got them.
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[quote]Jason84NA2T wrote: [quote=Firehawk]Originally posted by Evil Z31If you have over 150k miles on that motor, then you can almost bet that you're gonna need to regrind the crank and find oversize bearings.
My motor had 176k and needed it.
Can't go by miles. I have seen cranks that were 200k and perfect, 90k and needed polishing.
Are we talking grinding or polishing? They should always be micro-polished if you are building with fresh bearings...
I've never had a vg30 crank that needed grinding, but it seems all of the stock engines I have had were pretty well cared for... until I got them.Chuck Stong
300+ Parts and Performance owner
http://www.300-plus.com
2002 ZCOT president and always active member
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