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Author Topic: Inline-four crankshaft  (Read 168942 times)
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jacksoni
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« Reply #450 on: November 06, 2018, 08:08:48 AM »

Are your cam bores still straight? I've had some trouble with head warping (when I first got the head it was not straight and then I got it hot once and did further damage) and the cam tunnels were then out as well as deck not being flat.
« Last Edit: November 06, 2018, 08:22:26 AM by jacksoni » Logged

Jack Iliff
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Jack Gifford
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« Reply #451 on: November 07, 2018, 12:56:12 AM »

Yes, cam bores are aligned okay. Maybe I shouldn't have said the head "lifted", since the top surface of the head was still flat. The distortion was all at the head's deck surface- as if the center of the head got "crushed" a little. [These heads were made in 1961- cast aluminum alloys weren't as advanced as today's are].
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Jack Gifford
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« Reply #452 on: November 23, 2018, 10:44:41 PM »

Engine is back together. Too wintry now to wheel it outside for more test running.
Finally got around to some research that I had postponed. Put together a test sample to look at possible loss of fastener torque after heat cycles of the magnesium crank filler segments. Identical fasteners and material thicknesses as the actual crank, and included a steel-to-steel "control sample". Ran it through six cycles of 15 minutes at 230 degrees F, then cool. No real surprise in results- steel-to-steel lost 25% torque, magnesium-on-steel lost an average of 33%. That's still within the safety margin of the design, but not by a lot. Next time the pan is off I'll re-torque those fasteners.
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