W211 AMG Discuss the W211 AMG's such as the E55 and the E63

Is M113K an interference engine?

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Old Sep 9, 2022 | 11:54 PM
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NGL450 w/EORP, S550
Is M113K an interference engine?

Question in title.
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Old Sep 10, 2022 | 01:23 PM
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From the absence of valve relief on theses pistons it seems that way.


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Old Sep 10, 2022 | 04:23 PM
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Yes most definitely, and It doesn’t take much deviation from stock cam timing to have an issue.

Last edited by cdk4219; Sep 15, 2022 at 06:19 PM.
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Old Sep 12, 2022 | 02:41 PM
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Yes, that is why they have you set the crankshaft to 40 degrees after TDC when setting the cams. At that position all of the pistons are low enough to clear any valves that may be open.
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Old Sep 15, 2022 | 01:43 PM
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So if your crankshaft sprocket woodruff key lets go, there will be carnage?
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Old Sep 15, 2022 | 02:35 PM
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Potentially. The one key is shared by the harmonic balancer and the timing chain gear, so it's possible to shear it in half and let the balancer spin loose while still retaining the gear.
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