What is the maxium amount that you can shave from an LD9 cylinder head(thosandths of an inch)? - Third Generation Forum

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What is the maxium amount that you can shave from an LD9 cylinder head(thosandths of an inch)?
Thursday, February 12, 2009 12:44 PM
It is just as the title says. I'm currently in the process of rebuilding my head after a suspected blown head gasket. One of my spark plugs broke off in my cylinder head forcing me to remove it. I have everything taken apart but I need to know how much can be decked from the cylinder head. Ten-thousandths? twenty-thousandths? thirty? Somewhere in between? I am replacing the head with a spare that I have. Thanks in advance.

Jeremy



"Boosting a z..... one step at a time."


Re: What is the maxium amount that you can shave from an LD9 cylinder head(thosandths of an inch)?
Thursday, February 12, 2009 1:10 PM
I believe .040 is the max... any more and you get slack in the chain.

Unless you've warped the head, deck as little as you need to.

-Chris-



-Sweetness-
-Turbocharged-
Slowly but surely may some day win this race...
Re: What is the maxium amount that you can shave from an LD9 cylinder head(thosandths of an inch)?
Thursday, February 12, 2009 2:55 PM
From this article: (if it helps any)

http://babcox.com/editorial/ar/ar40032.htm

"The heads can’t be machined very much. The minimum thickness at the front of the head measured from the deck surface to the face of the bolt boss is 2.260".




Re: What is the maxium amount that you can shave from an LD9 cylinder head(thosandths of an inch)?
Saturday, May 02, 2009 11:27 AM
Just wanted to let all people know. I got it back together, and everything is working fine. I ended up decking the head 35 thousandths (I think). Now, if I can just ind a belt to bypass the ac compressor, which I never use.

Jeremy


"Boosting a z..... one step at a time."

Re: What is the maxium amount that you can shave from an LD9 cylinder head(thosandths of an inch)?
Saturday, May 02, 2009 5:23 PM
A/C DELETE PULLEY: 24574519
gets put in place of the A/C compressor. uses the stock belt



Edited 1 time(s). Last edited Saturday, May 02, 2009 5:24 PM


Re: What is the maxium amount that you can shave from an LD9 cylinder head(thosandths of an inch)?
Thursday, May 07, 2009 5:44 AM
Jon D wrote:A/C DELETE PULLEY: 24574519
gets put in place of the A/C compressor. uses the stock belt


Thanks for the info. I found a belt from advance that fit, the part number is out in the car. I was not in the mood to fool with removing the A/C pump. It does work, but it makes a terrible noise, (I think that the clutch is going out on it, which is also a sure sign of a compressor going bad) and it was eating up my belts. So I just bypassed it altogether. Seems to work just fine. I'm sure that the belt may at some point have issues, as the ribs are now facing the idler pulley. Alternator, Crank, idler, how is that for reducing rotational mass?

FYI, I will NEVER, EVER, EVER, EVER, use NGK spark plugs again. Porcelain insulator broke on a brand new plug. I've also broken them clean off in a cylinder head. That is what started this whole fiasco in the first place. I will say that they did give me a good excuse to rebuild the top-end side of the motor, and bump my NA compression up a few tenths. Not to mention polished valves, new gaskets and seals, and getting a good look at my block and my pistons, which all look like they will go another 160,000 miles I have noticed that the sound of the car (exhaust) seems like it has changed. A higher pitched tone from what I can tell. It may be just me though, as I have not drove it in a while.

Thoughts?

Jeremy




"Boosting a z..... one step at a time."

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