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#1
12-18-2002, 02:27 PM
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dimples on EX valves
I went to pick up a pair of cylinder heads for a 92's 300ZX at a machine shop. there was a MB 6 cylinder aluminium head sitting on top of another bench. Just curious...I flip it over and noticed two of the EX valves'(#2, #5) surface have little dimples on them but the rest of them are still fine(those fine circular lines are still visible). Any idea what contribute that...bad injectors??
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BJ 09 GL320 Bluetec 65K+ 07 E320 Bluetec 43k+ 05 Nissan Frontier NISMO 4X4 72K+ 07 Kawasaki Vulcan 900 5k+ gone 87 300SDL 158k+ gone 91 300D 113k+ gone 83 300SD 220K+ gone 89 300E sold 87 190E sold 83 380SEL sold http://banners.wunderground.com/bann...TX/Houston.gif 
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#3
12-19-2002, 02:14 AM
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They are about the size of pinhole scatter over the valve surface. some area where they are concentrated look like the top layer is peeled off and feel like 800 grid sand paper.
Color(a little pink) of those valves look normal to me and they both have some corbon deposit on top....
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BJ 09 GL320 Bluetec 65K+ 07 E320 Bluetec 43k+ 05 Nissan Frontier NISMO 4X4 72K+ 07 Kawasaki Vulcan 900 5k+ gone 87 300SDL 158k+ gone 91 300D 113k+ gone 83 300SD 220K+ gone 89 300E sold 87 190E sold 83 380SEL sold http://banners.wunderground.com/bann...TX/Houston.gif
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#4
12-19-2002, 05:12 PM
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Usually by Caterpillar's reuseability guide, any marks like that in ex. valves mean they are not reuseable. Intake valves can take more because they run cooler.
It sounds like debrit got in the cylinder and was pinched by the piston and exhaust valve.
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87' 300sdl
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