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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #1
How to Deck a Block




The block was brought in to be prepped for rebuild.

It has been Bored and Honed to .020 over std.

Checking the block I found it had .0025 taper from front to back and has water pitting.

I set the block on the machine fixture; the block is on the main saddles.

I make a .0005 pass, Cyl #1 is shorter than Cyl # 4


I see I have a good level set up side to side, notice the dark low spots around #1 cylinder.
A MLS head gasket will not have had a good sealing surface.

[


Pass #2 is a .0015 cut


Still some pitting at the fire ring of the head gasket.


One more pass of .0015
The block looks good, and has a good head gasket sealing surface.
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #4
Do you also chamfer the top of the cylinders?
Yes, I do If not, then it is about impossible to knock the pistons in and not damage the rings.

But It has been known if you piss off the machinist... a small detail like that could be over looked.
 

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ej8
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104 Posts
What is that bar doing sticking from both sides of block, on the crank place?

And how you leveling block against table or machine?
I guess you use dial indicator to find high spots on corners , and correct it by shimming the block if not parallel to the machine head.

could you please explain the process of leveling ?
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #6
The block is bolted to the bar.

The block mains rest on the bar, so the front to rear is leveled to the mains.

The a common machinist bubble level is used to set side to side level
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #8
I do not have one, just never been involved in a build that needed it.

Now I have modded blocks/heads and used larger than stock head studs when more clamping force is needed.
 

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DIY Guru
96 Ranger-stock
Joined
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637 Posts
Discussion Starter #10
About just drill and tap. Common on higher boosted 4g to convert from the 11mm/12mm hear studs to 1/2

Not all that supersonic, just make sure it is drilled and tapped straight
 

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DIY Guru
96 Ranger-stock
Joined
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637 Posts
Discussion Starter #12
I see it done simpler done on a closed deck block.

I know of too many boosted 4s running 70 lb/min turbos that are flat milled and running just fine.

If I had to do something fancy, I would o ring the block and cut a receiver groove in the head, Use stainless wire, and a good HG
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #14
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