Case inspection, align bore or not |
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Case inspection, align bore or not |
930cabman |
Oct 16 2022, 05:52 PM
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#1
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Advanced Member Group: Members Posts: 3,144 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States |
Recently I had my local good guy machinist make a steel inspection shaft to pickup the main bearing bores leaving a thou or so clearance. Seems to make sense, similar to installing the crank with new bearings and making sure the crank spins smoothly (easy). The next part of the plan would involve fabricating another gauge to pickup the cylinder mounting surfaces. Sure this can all be done with indicators, but I am trying another tack with this process. Thoughts?
I also use Plastigage to check actual (after crush) clearances Working a 2.7 911 cases I have found the main bearing bores become elongated due to many heat/loading cycles. This is very common to this magnesium case and keeps guys like Ollies in business. Is this elongation also common to our VW/914 cases TIA |
r_towle |
Oct 16 2022, 09:03 PM
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#2
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Custom Member Group: Members Posts: 24,588 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
First, find the bearings you can actually purchase.
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930cabman |
Oct 17 2022, 04:52 AM
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#3
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Advanced Member Group: Members Posts: 3,144 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States |
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barefoot |
Oct 17 2022, 06:56 AM
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#4
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Senior Member Group: Members Posts: 1,281 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States |
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930cabman |
Oct 17 2022, 10:03 AM
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#5
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Advanced Member Group: Members Posts: 3,144 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States |
First, find the bearings you can actually purchase. Got Silverline on the shelf Now, see if the main brgs. are a tight fit in the case, if so line boring probably not needed The testing gauge fits very good, turns by hand with a thou or so clearance at all four case bores |
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