Seriously? Factory Mistake?
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Tourer
Joined: Dec 2014
Posts: 268
Likes: 53
From: NE Ohio
Seriously? Factory Mistake?
So I just got done removing the factory exhaust gaskets to replace with new ones do to changing out the exhaust system. Take a look at the new gasket, the counter bore is off 1/8 of an inch from the bore (exhaust port). Been in machining for 20 plus years and can not imagine something like that getting thru quality. This is the rear port, the front port is even all the way around.
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Tourer
Joined: Dec 2014
Posts: 268
Likes: 53
From: NE Ohio
You may be right but for the life of me I can not figure out why the counter bore is not centered with the port. When I removed the old gasket a big part of the top was pushed into the port, I now know why, when you tighten the pipes down there is nothing to keep the gasket from going into the port. The counter bore I would think is there to seal the gasket. This is however my first time doing this so I very well could be wrong, it would be hard to believe it could be off that far. Why would the front port not be the same?
Seasoned HDF Member
Joined: Jun 2015
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From: Canada
The machine is indexed off of a specific point on the engine so everything is correct in relation to each other. That port being off is whats called a core-shift in the casting process. The cast port is off center, the machining is correct.
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Tourer
Joined: Dec 2014
Posts: 268
Likes: 53
From: NE Ohio
Seriously? I am all ears and open to suggestions, however taking a Dremel to this area does make me a little nervous? are you suggesting using a Dremel to open the counter bore? If so I can't see how I could get a good seal? These gaskets are almost a press fit, I would assume they are that way for a reason, I would think using a Dremel to open it up would not be good for creating a seal. Again this is my first attemp so I could be way off.
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Tourer
Joined: Dec 2014
Posts: 268
Likes: 53
From: NE Ohio
That's what I thought too, the other one was the same way. It looks like that is where they bonded the gaskets together during manufacturing. Is this not normal, they are the OEM replacements from the dealer? I haven't installed the pipes yet so now would be a good time change me out if they are defects. Thanks.
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Thread Starter
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Tourer
Joined: Dec 2014
Posts: 268
Likes: 53
From: NE Ohio
Good catch I bet your right. I used to work in a foundry and that was common from time to time. We always had jig gages to catch core shift castings.
