Alternator Case - Opinions?

[Carr C.]

Any opinions on this alternatop case top?

How does this look to some of you?

Would it pass judging?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=4629851942&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1

Thanks!

[D S.]

Re: Alternator Case - Opinions?

Go to this link to compare to a real one. The real ones have the A in 61A dropped slightly below the 61.

[Joe L.]

Re: Alternator Case - Opinions?

Carr-----

I didn't know that this style drive end case half (1969-L71) was being reproduced. In any event, the stamping does not look, at all, original to me. It's far too "perfect", far too heavily stamped compared to every original I've seen, and the font style is close, but not exactly like, the originals.

From what I can see of it, the case half configuration looks very good, though.

[Greg L.]

Re: Alternator Case - Opinions?

I was under the impression that all of these open faced housings had 6 support struts and not just 5. Would the two types be due to when it was cast or would one division use one type and an other divion use another type?

[Edward M.]

Re: Alternator Case - Opinions?

Didn't the original front cases also have a Delco emblem cast into them?

[Joe L.]

Re: Alternator Case - Opinions?

greg-----

The 69-L71 SI-series alternator front cases have 5 supporting ribs and not 6. I may even have referred to them in the past as "6 rib" and added to the confusion. However, if I ever said that, I was incorrect. 5 ribs is what they are and always have been.

Interesting side note: ALL SI-series alternators use a 5 rib drive end case half. And, the part number used in PRODUCTION for ALL of these was the same, "open face" (69-L71) or "closed face" (L71-1980). Apparently, the drawing and specifications for the case half were revised rather than a new part number issued. It may seem strange, but I feel quite confident that this is what happened. Sometimes, the slightest revision of a part results in a new part number. Other times, a major revision does not. I believe, though, that this was a situation in which the FUNCTIONALITY and APPLICATION of the part did not change, so it retained the same part number even though it was significantly revised.

[Joe L.]

Re: Alternator Case - Opinions?

Ed------

Yes, they usually did have such a marking, although I don't know if they all did. The marking was a small, raised character, Delco-Remy logo on the forward side of one of the mounting bosses (the "flat" boss with the smaller mounting hole).

[Joe L.]

Correction

I did a little more research and I found out something that had eluded me before. Some time ago, when I said that the 69 alternator drive end case had 6 ribs, I was correct and when I said in the previous post that it had 5 ribs, I was incorrect. The 1969, and possibly early 1970 DRIVE end case had SIX (6) ribs supporting the bearing. For most, if not all, 1970 thru late 1971 the case became 5 ribs. BOTH of these case halves have the "full open" design. That's what confused me; whenever I saw a "full open" case, I just assumed that the rib count was the same. It is NOT.

After about late 1971, the case half retained FIVE (5) ribs but the webbing between the ribs at the periphery was greatly increased and the case became the "closed" design.

As far as I can tell, though, all of these cases had the same GM part number.