jikyle
Parking Attendant
ZX 14 LSR
Posts: 2
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posted May 22, 2011 01:18 PM
ZX14 Piston Interference Problem
Just started reassembly of the engine. APE stoked the crank 4mm and supplied CP piston, Carrillo rods. Piston pin bosses on 3 and 4 cyclinders are contacting the crank gears. Can the piston be machined or is something else wrong?
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J Kyle
  
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entropy
Moderator
Posts: 8671
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posted May 22, 2011 08:57 PM
way back when i had a set of MTC's that did that (hit crank counter weights); just dremeled about .040 clearance.
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VincentHill
Needs a life
Posts: 6520
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posted May 23, 2011 11:46 AM
Do what Karl siad BUT do it to all of the Pistons and then using a Real good scale try to make all of the pistons, RIngs and Wrist Pins for each cylinder weigh the same.
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KZScott
Needs a life
high on speed
Posts: 7235
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posted May 23, 2011 03:09 PM
 Edited By: KZScott on 23 May 2011 23:13
good tips. one of my buddys that builds a lot of car motors had this issue once when i was at his shop, he was using i think emery cloth or sand paper strips... was a couple yrs ago. he was doing it in such a way that he brought the piston down so it was just about touching, squishing the sand paper inbetween then pulling it back and forth so it only sanded the area that needed clearancing. dremmels may get away from you if you arent really careful. might be harder to do with a bike tho....
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tcchin
Zone Head
Posts: 867
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posted May 23, 2011 10:11 PM
I think I would call APE before you remove any metal. They may have made a mistake on the parts that they shipped. If they give you the go-ahead on material removal, I'd call CP to see what the margins are on that pin boss.
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entropy
Moderator
Posts: 8671
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posted May 23, 2011 11:12 PM
quote:
I think I would call APE before you remove any metal. They may have made a mistake on the parts that they shipped. If they give you the go-ahead on material removal, I'd call CP to see what the margins are on that pin boss.
good advice.
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted May 24, 2011 04:06 AM
Edited By: Y2KZX12R on 24 May 2011 12:07
quote:
I think I would call APE before you remove any metal. They may have made a mistake on the parts that they shipped. If they give you the go-ahead on material removal, I'd call CP to see what the margins are on that pin boss.
+1
Thats a sensitive area thats under tremendous load at TDC overlap.
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Y2KZX12R
CompetitionCNC.com
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted May 25, 2011 03:44 AM
See my post on the same thread on the zx14 side. might be the gear.....
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Y2KZX12R
CompetitionCNC.com
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