Maximum Allowable Variance in Deck Height, Stock 2.0 Liter Four |
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Maximum Allowable Variance in Deck Height, Stock 2.0 Liter Four |
motorvated |
Jan 18 2020, 10:18 AM
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#1
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Member Group: Members Posts: 279 Joined: 13-February 13 From: Colorado Member No.: 15,519 Region Association: Rocky Mountains |
I'm in the process of re-assembling the top end of my stock 2.0 liter four, and I have measured deck heights as follows:
#1 - 0.036 #2 - 0.029 #3 - 0.037 #4 - 0.035 These measurements are with the cylinder base sealing rings in place and the cylinders torqued down snugly and measured with a dial gauge. To me it seems as if I need to add a shim to the bottom of cylinder #2 approx. 0.050 - 0.080 to increase its deck height to within the range of the others. I have a couple of used 0.080 shims, one of which I could add to cylinder #2 to bring it up to 0.037. I have a couple of questions about this. First, how much variance is permissible between the measurements? If the deck heights are all within 0.002 of one another, is that Ok or do they need to be exactly the same. Second, can I re-use one of my 0.080 shims or should I source a new one. And third, do I place the shim on top of the cylinder sealing ring, beneath it, or doesn't it matter. I was planning on putting it on top of the sealing ring. Thanks in advance for your advice. |
yeahmag |
Jan 18 2020, 07:47 PM
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#2
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
The individual deck heights are less of a concern than having each pair of cylinders even. I use to make a tool to do this, but you can probably work something out with a straight edge, some spacers, and the cylinder head nuts.
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Mark Henry |
Jan 20 2020, 09:51 AM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
The individual deck heights are less of a concern than having each pair of cylinders even. I use to make a tool to do this, but you can probably work something out with a straight edge, some spacers, and the cylinder head nuts. I picked up one of your tools used. Were there any write ups or instructions on how to use it? I found the original pictures and see how it’s bolted up and seen how the plate locates over the pistons. What type of mounting is used for the dial indicator? Aaron I think I inherited one of your tools, is it two machined alunimum bars with a keyed plate that drops in for measuring deck and 4 spacers? I'm using it for the first time and have to say it's a nice piece of T4 kit. (IMG:style_emoticons/default/thumb3d.gif) |
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