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aaz valves and srings
by
paolomarks
on 24 Mar, 2011 06:23
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Hello, I've got an AAZ out of a 96 golf(Canada) is it true that the AAZ only had outer valve springs? Mine have no inners. If needed can I replace them with inners from a 1.6 NA mechanical head? Thanks in advance, Paolo.
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#1
by
Thezorn
on 24 Mar, 2011 11:08
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Mines a 93 AAZ and it has 2 valve springs per valve.
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#2
by
Mark(The Miser)UK
on 24 Mar, 2011 15:22
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2 springs and identical to the 1.6td ones & n/a 
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#3
by
paolomarks
on 25 Mar, 2011 21:01
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thanks, for the replies. Wonder why the PO removed the inner springs? Any advantage to doing so? Paolo
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#4
by
Vincent Waldon
on 25 Mar, 2011 21:42
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Both my AAZ heads only have single springs.
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#5
by
rabbitman
on 25 Mar, 2011 21:53
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Don't some AAZs have 7mm valves and some 8mm? If that's right maybe the lighter 7mm ones don't need as much spring strength to return it.
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#6
by
rallydiesel
on 25 Mar, 2011 22:03
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I have a head with 8mm stems and single springs.
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#7
by
Mark(The Miser)UK
on 26 Mar, 2011 08:14
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Reading up; AAZ had inner and outer springs, up to 1997ish, then had only one spring, whilst the 1Z and AHU began/carried on the dual spring setup. Code was 028 109 623 A, outer, and 028 109 633A inner, later the single spring was 028 109 623B
Interestingly it seems the AAZ continued to be issued with the dual spring 'carrier'
Finally ABA,and AAC came along with the 028 109 623 'C' outer, no inner
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#8
by
paolomarks
on 26 Mar, 2011 18:22
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Hey, you guys with the newer AAZ's with only one spring, I'm wondering if your springs have the lower "Carrier" to center and support the spring, like the 1.6's have. My '96 just has the top "carrier", which by the way is the exact same part as the 2 spring models. Why did VW switch to the one spring.? Don't 2 dissimiler springs reduce vibration because their differing vibrational frequencies tend to cancel out unwanted vibration?. What do you guys think.? Paolo
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#9
by
rallydiesel
on 26 Mar, 2011 18:46
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Mine has a top and bottom spring plate. Wouldn't the spring wear into the aluminum head if there was no lower plate?
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#10
by
paolomarks
on 27 Mar, 2011 07:37
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Has anyone ever seen a single spring set up without a lower "carrier"? This is how I found mine, but I have no idea what the PO did. Thanks, Paolo
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#11
by
Vincent Waldon
on 27 Mar, 2011 10:26
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Yup... that's how my single-spring heads are.
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#12
by
paolomarks
on 27 Mar, 2011 16:45
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Great!, Thanks for the help. Question still remains, though , why would VW switch from a 2 spring set up to the single.? Cheaper? Less reciprocating mass?.