RE: Exactly how many have had HEAD/Valve Problems
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[Poll]
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Exactly how many have had HEAD/Valve Problems
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| Less than 2000 miles |
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| Between 2000 and 5000 miles |
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| Between 5000 and 7000 miles |
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| Between 7000 and 10,000 miles |
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| Between 10,000 and 15,000 miles |
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| Between 15,000 and 20,000 miles |
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| Between 20,000 and 25,000 miles |
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| Between 25,000 and 30,000 miles |
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| Between 30,000 and 35,000 miles |
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| Between 35,000 and 40,000 miles |
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| Betweem 40,000 and 50,000 miles |
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Total Votes : 67
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(last vote on : 3/30/2008 12:40:48 PM)
(Poll will run till: -- )
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RE: Exactly how many have had HEAD/Valve Problems - 4/5/2008 1:29:38 PM
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tlthehun
Posts: 1
Score: 0
Joined: 4/5/2008
Status: offline
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Just a little reality check for the, uh, more passionate amongst you H3 owners.
Those that fall into the affected VIN range should plan on having your cylinder heads updated. The fact that you haven't had a valve seat problem in less than whatever miles does not mean that you won't. Try to get the work done when it's convenient for you. Even 200,000 miles before a valve job is no great accomplishment for a modern engine.
My understanding is that some H3s have "soft" valve seats. I believe that a softer valve seat makes for a better valve seal but too soft and the valves sink into the cylinder head. I don't know if the DOHC I-5 in the H3s have mechanical or hydraulic valve lifters or adjusters nor if hydraulic would avoid a problem but I do know that with mechanical lifters when the valve sinks into the valve seat, the "valve clearance" is reduced. If it is reduced to zero or less, then the valve will always be open. This is likely the point where a "check engine light" would come on.
What you need to also consider is that the valve clearance is also about the same thing as the cam to lifter (rocker arm, tappet) clearance. Zero clearance means essentially zero space for a layer of oil between those two parts and accelerated wear of both.
I strolled in here to read up on the H3's as I need a truck or SUV with four seats and had dismissed GM because of my perception of poor quality but the H3 caught my eye from a design and features standpoint to the degree that I think it or the upcoming H3T would fill my needs.
For someone like me that has always done his own repairs, dropping $30,000+ on a new vehicle that will depreciate $200-300 a month when my existing ones are working just fine, cost me basically nothing and are barely worth selling is a hard decision, worsened by the seeming lack of assurance that new will gain me anything from a reliability standpoint.
It's not just the H3s, everything I've considered has had issues.
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RE: Exactly how many have had HEAD/Valve Problems - 4/6/2008 2:41:28 PM
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3hummers
Posts: 11836
Score: 0
Joined: 9/23/2007
Status: online
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Our 2008 has been an awesome vehicle. No known issues at all.
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2006 H1 Alpha wagon
2000 H1 Slantback
1997 H1 wagon
2008 H3 Alpha
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RE: Exactly how many have had HEAD/Valve Problems - 
