![]() In fact, that part of the valve cover could be a jagged, oversized mess and would still work as long as the coil could have a place to sit and still be secured by its socket head screw.įor the OP ( ), those pictures he posted show valve covers that are still serviceable in terms of re-installing a spark plug tube oil seal and having it still work properly. I just replaced the spark plug tube seals and re-installed the cover for all of those, as the places where the corrosive damage occurred is not relevant to allowing that spark plug tube seal to work. Granted, they all showed very little to "almost not detectable unless I was looking for it" amounts of this, but it was there. I've replaced a number of valve cover gaskets and the spark plug tube seals in those covers when performing valve clearance checks / adjustments for J35 V6, F23 I4, K24 I4.Īll of them showed varying degrees of corrosion in that area of the spark plug hole. Makes me wonder if these valve covers are magnesium-aluminum alloy. They know exactly how many cycles it takes and they know it'll be WELL past warranty, so.good enough, pencils down boys. Heck, most likely is that even with identical CTE a temperature gradient (which certainly exists) is going to put stress in those parts, leading to fatigue failure after enough temperature cycling. Even the small CTE difference between cast aluminum (especially if more modern castings have some sort of additives or other junk thrown in) and milled plate alloys will lead to some stress. With no fatigue limit, any level of stress greater than zero will eventually cause aluminum to fail. I think he's right on that point, but I'm also wondering if there is a CTE mismatch somewhere, causing thermal stress in the cover itself. He thought maybe the aluminum casting is just low quality or made with recycled materials, etc. I talked to the tech, who has worked on Honda/Accura for 20+ years, and he was certain the cause was heat related since in his experience he's always seen it happen in the cover nearest a major heat source (confirms many opinions in this thread as well). I'm having the 100k service done at the dealership, and the report of "corrosion" of the cast aluminum valve cover and the $500 part cost were enough to get me to drive over there and put eyeballs on it. I'd post the photos but they look IDENTICAL to all the ones already posted here. I'm living through this issue right now on a 2015 Ody EX-L. How could a hole develop in the vc like that? ![]() What could cause the chalky grey dust & apparent melting of the aluminum behind the plug well seals?ģ. Anyone ever heard of the first issue before The difference in motors for the 2008 model year?Ģ. So all that to say, I've got the following questions:ġ. The proper vc is "on its way" because "we have to order that". ![]() (?!) so, the aftermarket vc gasket is for the 2007 but the dealer vc is for the 2008. After looking at the Honda part diagram on majestic Honda's site, it looks like the 2008 one, Not the 2007. So, I go to order a new valve cover from my local Honda dealer and I insist on the 2007 vc. Now I'm having my doubts - perhaps this was in an unreported front end collision?Īnother thing I noticed under the other plug well seals is the appearance of the aluminum melting and leaving behind the chalky grey dust. I'm confounded - how does this happen? When I bought the van, the carfax said "no accidents". Upon further inspection, I see the outside hole of the plug well isn't even round - it's elliptical. I scrape it out and discover a hole in the vc - right next to the plug well. As I removed the middle one, I see a bunch of chalky grey powder underneath the seal. I'm thinking, "what does that matter?"Īs it turns out, the gasket set I needed was for a 2007 motor apparently they'd had a slight change part-way through that model year.Īfter getting the 2007 vc gasket set, all is well and I get the rear vc back on and move to the front vc.Īfter removing the vc from the van, I proceed to take it to my workbench to swap out the spark plug well seals. So I run down to my local "Irish" named auto parts store and the guy behind the counter happens to ask if the mfgr date was "06/08". I double checked the Fel-Pro box to confirm the part number sent - it's consistent with the site. I ordered the vc gasket kit for a 2008 odyssey ex-l. I went back to rock auto's site to double-check I'd ordered the correct part.yep, I did. When i went to put it on, I discovered I had the wrong gasket. I ordered a fel-pro vc gasket kit as the van was leaking from the vc.
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