Fastener Frustration - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 17 (permalink) Old 02-14-2017, 10:31 PM Thread Starter
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Fastener Frustration

OK. Began with a rookie mistake by losing track of the two alternator pivot bolts on the L28 engine I am re-building.

The problem:
The pivot bracket takes an 8mmx1.25 bolt (both sides), but the alternator pivot holes are 10mm. I can't believe that the 8mm bolts are meant to rattle around in the 10mm holes.

The question:
What am I missing (besides the bolt themselves)? Are the bolts shouldered or is there a sleeve(s) (tho my parts diag. does not indicate either)?

A little help please.



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post #2 of 17 (permalink) Old 02-22-2017, 12:47 AM Thread Starter
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Really? 110 views and no one can tell me about the pivot bolts on the L28 alternator?

I'll admit it was pretty dumb to lose track of them, but isn't that punishment enough?

How about a little charitable help here folks.

Please.



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post #3 of 17 (permalink) Old 02-22-2017, 02:15 AM
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Did you ever hear of a shoulder bolt?
Edit: You asked above if it was a shoulder bolt. Makes too much sense that it isn't. Search MSCdirect.com.

zippityzda

Last edited by dumbestone; 02-22-2017 at 03:03 PM.
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post #4 of 17 (permalink) Old 02-22-2017, 11:34 PM Thread Starter
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Mr.dumbstone:

Thanks for the reply (however cryptic); I was beginning to think the thread was invisible.

Yeah, I could buy something new to do the job, but I would prefer to know how it was done in the first place.

At the very least, I would then know what I am looking for among my parts.

The other thing is that I'm kinda sure I don't remember any shoulder bolts in the dis-assembly phase.

I know, if I'm so smart, how did I manage to lose them in the first place. I wish I knew. I'm guessing the disconnect came when I painted the pivot block. At any rate, I can't put my greasy fingers on them now, so...

C'mon folks; surely someone out there has removed their alternator before. A little friendly help here would be appreciated.



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post #5 of 17 (permalink) Old 02-23-2017, 01:59 AM
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Looking at your alty, does it have ears that (1) have a raised section on the front face like this pic and (2) what appears to be a bushing sticking out the inside of the rear ear like in the pic?
Attached Images
File Type: jpg Alternator70_to_83.jpg (67.0 KB, 8 views)

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post #6 of 17 (permalink) Old 02-23-2017, 02:03 PM
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fairly obvious they are M10 bolts. stick a matchstick in there to get the depth of the hole. add the thickness of the alternator flange and voila you know the length of bolt needed. ain't rocket science son. next time if you get a piece of cardboard and stick the bolts in it with a note as to where they go you won't have that problem

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post #7 of 17 (permalink) Old 02-25-2017, 11:51 PM Thread Starter
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Spot on, Mr.dumbstone; that is indeed the alternator with the 10mm bolt holes that inhabits my Z's engine room, and the very same subject of this inquiry. Good deduction.

But, Mr.rogerz (and as much as I hate to spoil a good snotty-on), the pivot piece (that the pivot bolts go into from each side of the alt. and that is, in turn, bolted to the block to carry same) has 8mm bolt holes on each end for those pivot bolts, and that ain't "rocket science" either dad, but it is plenty obvious.

As to the crayon on cardboard thing: thanks for the sage, if somewhat condescending advice, but my regimen is usually somewhat more rigorous than that. That said, it is obviously not perfect, nor am I, or as one wiser than both of us once noted: "Sh*t Happens".

But thanks anyway, I'm sure.



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Last edited by ensys; 02-25-2017 at 11:54 PM.
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post #8 of 17 (permalink) Old 02-26-2017, 04:05 PM
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If the pivot piece has threaded 8mm at each "end", does that mean the bolts go from the inside of the ears to the pivot piece?
Thinking shoulder bolt here again.

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post #9 of 17 (permalink) Old 02-26-2017, 11:31 PM Thread Starter
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Getting closer...

The pivot piece occupies the space between the ears of the alt., thus the bolts thread from the outside, in.

Yeah, I would think "shoulder bolt" too, but the problem is (bearing in mind the credibility issue of having "misplaced" the buggers in the first place) that I feel certain I would have taken notice of the uncommonality of any shouldered bolts, as they would be the only such fasteners in the engine room (or anywhere on the chassis for that matter), and I did not.

I think it is more likely that there was a sleeve on each straight bolt, and fabrication of same is my likely solution to this situation. The point of the posting was more about "original intention" than "what now".

Oh, and the "pride" thing, as since 1979/30k mi. (now, 200K mi. and still counting), mine has been the only wrench to touch the rascal, and it annoys me that I may have created this situation in the first place. Thus, I can't help wondering what the original configuration might have been. I suppose I cannot rule out the possibility that I purchased a "rebuilt" unit that was not actually correct for this application. I'll have to dig thru the log for some clue here.

So Mr.dumbstone, as you figured out what I have, do you know its original/intended application? Or perhaps more to the point, do you by chance have a part no. or some such, for the alt. that may be correct for my early '77 280?

Then there is the mystery of why no one else on here seems to have a first-hand knowledge of the situation.

Anyway, thanks for stepping up to have this consultation with me.



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Keep 'em flying...

S.J.Szabo
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Last edited by ensys; 02-26-2017 at 11:43 PM.
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post #10 of 17 (permalink) Old 02-27-2017, 01:38 AM
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The shoulder on the bolt would only be about a .025" ridge behind the threads. Check your supply.

I don't doubt that a "shoulder bolt" or bushing would be used to provide a mounting that did not place the hole in the alty over threads.

There have to be hex head shoulder bolts out there somewhere, but so far the term shoulder bolt seems to refer to an allen head bolt. Two options to save making something are below.

https://www.mscdirect.com/browse/tn/...099+4287779093

https://www.zoro.com/value-brand-bla...10/i/G2642407/

zippityzda
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