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What is the flatness limit of head and deck? Are resurfacing necesary?

What is the flatness limit of head and deck? Are resurfacing necesary?

 
Old 10-15-2018, 04:33 PM
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Default What is the flatness limit of head and deck? Are resurfacing necesary?

Hello,

I am thinking of taking apart of my junk yard found B20B. I am wondering what is the limit of the head and deck flatness. Are re-surfacing still necessary if they measured good?
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Old 10-15-2018, 06:38 PM
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Default Re: What is the flatness limit of head and deck? Are resurfacing necesary?

How are you proposing to measure your "flatness"?

It's my understanding it's pretty expensive equipment required to measure the smoothness of a surface (RA value) which is the specification I think you are after.
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Old 10-15-2018, 06:41 PM
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Default Re: What is the flatness limit of head and deck? Are resurfacing necesary?

Originally Posted by TomCat39 View Post
How are you proposing to measure your "flatness"?

It's my understanding it's pretty expensive equipment required to measure the smoothness of a surface (RA value) which is the specification I think you are after.
Yeah... Sorry for the bad terms i used. I am just gonna use a ruler and filler gauge to measure the gap... What is the limit ? one thousandth of an inch? So if it passes, I can skip re-surfacing, correct?
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Old 10-15-2018, 06:45 PM
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Default Re: What is the flatness limit of head and deck? Are resurfacing necesary?

I don't know off hand what vehicle the B20B is found in, as such I can't see if I have the FSM manual to look up the warp specification.

You actually do want to know if the head/block is flat. And for that you can't just use a ruler, you need a precision straight edge.

I thought you were concerned about the surface smoothness which is important for head gaskets.
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Old 10-15-2018, 07:00 PM
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Default Re: What is the flatness limit of head and deck? Are resurfacing necesary?

You’ll need an actual straight edge, not a ruler. You want something that is from Starrett, brown & sharp, etc. a ruler is not accurate enough.
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Old 10-15-2018, 07:01 PM
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Default Re: What is the flatness limit of head and deck? Are resurfacing necesary?

TomCat39 the b20b is out of a CRV. It SHOULD measure the same as a b18b, but I am not 100% sure.
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Old 10-19-2018, 08:04 AM
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Default Re: What is the flatness limit of head and deck? Are resurfacing necesary?

Sorry for the delay. I just remembered about this....

This is from the 97-00 CRV FSM. It only displays one engine so does not identify it but I do assume it's the B20B in question:





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