New bolts after removing the flywheel? - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 5 (permalink) Old 09-12-2019, 01:09 PM Thread Starter
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New bolts after removing the flywheel?

I removed the flywheel from my '71 to get it resurfaced. It's probably not the first time it's been removed but I'm willing to bet the same bolts have been reused. I know some bolts, such as the ones attaching the head to the block, should be replaced each time, but does that hold true with the flywheel?

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post #2 of 5 (permalink) Old 09-12-2019, 02:35 PM
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I have never replaced them. Normally bolts that are replaced are either aluminum or subject to enough torque that they stretch. I'm not aware (note qualifier) that this is the case for flywheel bolts on cars of this era.

I didn't replace them on my 1983 ZXT when I did the clutch and it's fine 24 years later.
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post #3 of 5 (permalink) Old 09-20-2019, 02:35 PM
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Originally Posted by pilgrim View Post
I have never replaced them. Normally bolts that are replaced are either aluminum or subject to enough torque that they stretch. I'm not aware (note qualifier) that this is the case for flywheel bolts on cars of this era.

I didn't replace them on my 1983 ZXT when I did the clutch and it's fine 24 years later.

If the flywheel bolts get over torqued or the heads get rounded off then yes they'd need to be replaced. Otherwise, they don't wear out. The head bolts don't need to be replaced every time either. If they show pocking anywhere on the shaft, or if they get over torqued or bent, then yes replace them. After cleaning and wire wheeling the head bolts, I put them under a high powered magnifying glass and scrutinize them looking for any pocking. Otherwise, they're good to reuse as well. I've never had a head bolt break on me when I was installing it on the L engines. Z man of Washington

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post #4 of 5 (permalink) Old 09-20-2019, 05:11 PM
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The Germans are the ones who are big on single-use bolts. BMW seems to be one of the leaders in that approach: single use aluminum or alloy bolts on the oil pan, alternator, and lots of other places. I'm convinced they're adding complexity because they can, and then declare it "correct" because of a compulsion to be more technologically spiffy.
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post #5 of 5 (permalink) Old 09-21-2019, 02:54 AM
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^ +1 With all the aluminum parts that bolts go into, it would seem the parts would strip before the alloy bolts do. Maybe we should be throwing away the aluminum blocks and reuse the bolts.

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