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Mivec gear 14mm hex cap

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Old Dec 11, 2017, 04:25 PM
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Mivec gear 14mm hex cap

Any ideas on how I can get the stripped cap back out? It's leaking oil and I got a new cap o ring for it.
Old Dec 11, 2017, 07:30 PM
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Just thinking out loud. That part is called the CAMSHAFT SPROCKET CAP

Looks like it should have been torqued to 24ft lbs

Just wondering of you can chisel it loose?. Even if you have to place a groove in it using a Dremmel type process

Old Dec 11, 2017, 08:30 PM
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Originally Posted by MinusPrevious
Just thinking out loud. That part is called the CAMSHAFT SPROCKET CAP

Looks like it should have been torqued to 24ft lbs

Just wondering of you can chisel it loose?. Even if you have to place a groove in it using a Dremmel type process
I actually tried that and ended up chipping a piece off and that's why it's leaking oil. I could try that again or maybe weld something to it with an aluminum welder.
Old Dec 11, 2017, 08:42 PM
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These are a PAIN in the ***. I've been through this a couple times, though LOL:

With the two I had to force out, the hex area kept stripping and disintegrating until pretty much round. I don't even know if these are aluminum. They are super brittle. Like magnesium? Anyway.

If I remember right: To get mine off, I had to drill the center out. It's really thin so be CAREFUL: you will break through in no time. I mean like a couple mm thin. I then forced a hex socket (see pic below) into the new hole and was able to break the cap loose Be careful, there's an oil passage behind it. It's thin and brittle enough to maybe drill a hole or two then just knock it out with a screwdriver and hammer?
The above idea is good too. If you can grind a notch, then use tap on a chisel while turning it, that may work.
It all depends on how tight it's put in.

Once you get it off and you go to put the new one in, get the correct size hex head SOCKET. Do not use a regular allen wrench. The hole is shallow, you will get in there crooked, and it will strip; eventually. I believe it's 14mm, as you mention:





Take a grinder and grind it flat. Get rid of the chamfer (see arrrow). You want this thing to sit as flat and far in as you can get it.
Torque to spec. More importantly: use this tool to remove the plug. While using a ratchet, you can use your free hand to really hold in place. Once I've removed a plug two or three times, I replace it with another, if it's looking shady. The cost is worth not having the trouble you are in right now.


You can get away with putting in a new cap and using a regular allen wrench, but it's risky and seems to eventually fail. Ultimately up to you. The sockets are cheap though.

Good luck and be patient.
Old Dec 11, 2017, 09:36 PM
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Use a sharp chizel and tap it in a left rotating manner.

Drilling the center is gonna put metal flakes in the cvvt.

They arent that tight. You likely used wrong size.
Old Dec 11, 2017, 11:16 PM
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When I tried a chisel, it just chipped away in flakes. Maybe he'll have better luck.Here's to hoping so.

hard to say how tight that thing was put on after the cam swap (I assume, based on the cam gear, etc.)
Old Dec 12, 2017, 06:47 AM
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If you get any metal flake inside of the cvvt i would replace the entire gear. That oil is gonna cycle back in your block with metal flakes.
Old Dec 12, 2017, 08:02 AM
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I'll try using a big chisel and see how that works. I'll let you guys know.
Old Dec 12, 2017, 08:22 AM
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Im not sure if this will work but just throwing this out there as Ive done a similar thing in the past albeit not on this particular part. Try using a torx bit that is slightly too large and hammer it on there and maybe that will give you enough bite to get the bolt out.
Old Dec 12, 2017, 05:52 PM
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Worse case scenario and you get metal into the gear, it's super simple to take apart and clean. Not that big of a deal.
Old Dec 13, 2017, 09:49 PM
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Chisel method works for me every time when they strip.
Old Jan 1, 2018, 05:44 PM
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The hammer and chisel method worked! Thanks everyone for the advice and help.
Old Jan 1, 2018, 06:05 PM
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Sometimes reverting back to techniques of the "Stone Age" works

Fire works sometimes too (the blue wrench)
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