Not sure why the dealers are saying there are "x-number" of other vehicle waiting for cylinder heads. It seems like everyone who has had problems with the heads make this type of statement, and with the number of reported replacements, I'm having a problem believing the dealers.
There is a problem happening with some of the cylinder heads (valves), and parts are hard to come by at this time due to the supplier. However, as of last Monday, there were only 157 cylinder heads replaced out of approximately 35K H3's produced.
For some reason, Colorado/Canyons do not have as many replaced, but that could be it is an optional engine on that truck.
GM is looking at the problem very seriously, but at this time, there is no root cause for these valves to fail.
Supplier is in the process of booting up production, and to produce a full head assembly for replacement. At this time, the head is bare, and the dealer has to build it up with valves, springs, retainers, etc.
I can tell you this, to replace a cylinder head on the I-5 is about a two day process. The oil pan must be removed to remove the front cover, which means the front axle has to be moved, and I believe on the H3 the steering gear has to be removed too.
Won't help those with parts on order at this time, but in the future, parts will be more readily available in the future.
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Black Sheep Hummer Squadron
(ME TOO)
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