1100693 alternator. Need correct date for my car.

[Leon in Mn.]

Hello again.  I am looking to get the correct alternator, 1100693, 37 amp. alternator for my 67 Camaro but was wondering about how much in advance was the alternator built before the final assembly date?  I have found many answers to this and am thinking it might be just a few weeks before?  How about up to a month before assembly?  My car was built the 3rd week of March, 1967.  With that date, I'm thinking it should read about 7C.  Possibly 7B? or would that be too early?  This is a BB car from LOS, so there is no ac., a 37 amp.
Thanks.

[x77-69z28]

Either would work. For reference, my 12D 67 RS/SS alternator is dated 7M6.

[Mike S]

 Parts like the 1100693 were consumed quickly due to being standard on cars unless an alternate amperage was ordered so you should see a much closer built date relative to the build date of the car. My NOR car has the standard 37A unit so the build date was more recent relative to the cowl assembly date but after the engine build date. Below are the dates for my '67's. Notice how the standard 37amp alternator is about a week behind the car assembly date compared to the longer date lapse for the non-standard 42amp LOS car.

NOR - Cowl date - 5B - Alternator date 7E4 (standard 1100693 -37A) - voltge regulator date - 7E
LOS - Cowl date - 4B (UOIT lists 4/13/67 specifically)- Alternator date 7A30 (optional 1100696 - 42A) - Voltage regulator date 7C


Mike

[Leon in Mn.]

Sounds great.  I think I will look for the 7C. 37 amp.  I think this was assembled March 31, 67.  I don't think there is any reason to believe it was anything other than a 37 amp originally.  I don't have a build sheet or POP.  Would it make a difference if it was a RS/SS?.
Thanks for the input.

[Mike S]

I think you may need the larger capacity if you have a lot of options drawing amperage including A/C.

Mike

[Leon in Mn.]

Hey Mike~
There is a BB (396) in there so AC wasn't available in 67, until 68 with the BB.  Other than a AM/FM radio and console, it doesn't have any other options that take power.  Unless, the headlight doors made the difference? 

[Mike S]

 My NOR BB has the basic 37a unit. Only options outside the SS are an AM radio, gauges, R/S and manual transmission.
 The LOS BB car that has the 42a K79 alternator option only has the AM radio w/rear speaker, R/S and TH400 transmission.
I've seen the K79 before with other originally equipped TH400 cars but not sure why. It wasn't mandatory for that tranny option.

Mike

[MyRed67]

My 1100693 Alternator is dated 6 K 21,  Block is dated 10 26 per the front pad.  This engine is in a 11 A built Camaro.  So Alternator date is only 5 days prior to Engine build date.  I know,,,this seems pretty close, but I'm pretty sure it is the original.

[Leon in Mn.]

Thanks.   Maybe others can shed more input??  If this is a LOS 396 RS/SS, with auto transmission, and the only other options taking power is the AM FM radio, console gauges etc, would there be a 37 amp in there or the larger 42 amp?  Someone put in a 55 amp 100803 in there now.  Don't know where that came from but that's what they did years back.  Would courtesy lights in this package require an upgraded alternator?  I'm sure that a 37 amp would be plenty for what is there but I just want to get the right one that would have been in there originally.

[Mike S]

Thanks.   Maybe others can shed more input??  If this is a LOS 396 RS/SS, with auto transmission, and the only other options taking power is the AM FM radio, console gauges etc, would there be a 37 amp in there or the larger 42 amp?  Someone put in a 55 amp 100803 in there now.  Don't know where that came from but that's what they did years back.  Would courtesy lights in this package require an upgraded alternator?  I'm sure that a 37 amp would be plenty for what is there but I just want to get the right one that would have been in there originally.

I did more research last night on the 42amp being used with the TH400 option. I found a similar discussion on a Chevelle site and stated that the 42amp unit came with the TH400 transmission and it was confirmed on some CD a person had that contained option info.
  I believe it had to do with the 42a having a higher minimum charge output at idle with the TH400 compared to the 37 amp that came with a manual transmission (unless options dictated otherwise). Looking at the tuneup specs for the 67 w/396, the TH400 idled 100 RPM's lower (700 M/T vs. 600 A/T) than the manual transmission so that is likely why the 42amp, with the higher idle current output, was used.

Mike

[Leon in Mn.]

Now THAT'S what this forum is all about.  THANK YOU MIKE for pointing that out!  That does make sense to me.   I suppose also that when sitting in traffic or at a stop sign your foot is always on the brake more with the automatic than the manual transmission and using brake lights/amp draw as well as other functions, heater, ignition coil lights, etc.  .   You have changed my mind.  Now I will look for the 42 amp either a 7C or 7B.    I'm sort of glad I didn't go with the 1100693 now.  Thanks again!

[Mike S]

 Glad I was able to be of some help  Actually, I'm glad this discussion came up because it triggered a curiosity about why my 67 LOS (I owned going on 34 years now) had the 42amp in the first place. It is original to the car and I never gave it much thought until now. In the past I figured it was because the dual belt pulley, used with the smog option, is installed (was a Ca. car originally) and that was the reason for the 42amp unit. I've learned since then that the pulley installed varied based on engine ordered so the dual belt pulley was not unique to the 42amp alternator. I didn't relate the 42amp with the TH400 usage until this discussion and past observations.

Mike

[Leon in Mn.]

My 67 alternator also has a dual pulley on it but I thought it might be installed to "use" the empty pulley spaces on the crank and water pump, for looks (mine is a California emissions too) so you are saying that the dual pulley was used along with the alternator and air pump together??  I thought it may have had the single pulley alone and the air pump just went around the crank pulley and the water pump.  I really need to look at the AIM again.  its been a while and its cold here in Mn.

Do you have the 7037210 quadrajet?  I'm still looking for one.  I found a 7027210.

[Mike S]

 I'll take a picture of my belt setup and post tonight so you can see the dual belt drives. It's not a show car but it is original.
I have the 7037210 carb.

Mike

[Mike S]

 Here are two views of the pulley and belts for the K19 smog option. The very bottom pulley (not pictured) has 3 grooves and made of cast iron.
Notice the 42amp alternator with the 2 groove pulley. Let me know if you need any closer shots.

Mike

[KurtS]

Yes, 396 cars with TH400 appear to have received the 42A alternator. I'd be curious if someone can find that in the 67 Camaro literature.

[Mike S]

 I'm looking for a reference to Camaro 396/TH400 but I did find this on a Chevelle site; http://chevellestuff.net/qd/alt_numbers.htm
Check the section titled "1967 - 283/327/396" optional 42 amp (std w/TH400 (stamped "CS") (RPO K79)    1100696    42

 In addition, I see quite a few 696 alternators on eBay and many are stating for Camaro, Chevelle or Vette BB's. There sure seems to be a correlation.

Back to investigating for Camaro...........

Mike

[Leon in Mn.]

Thanks Mike for the pictures!!   It's always nice to see other BB's with auto transmission as there are not that many out there.  I like to see the way your smog pump is mounted as mine is not there anymore after many years being gone.  Who knows what ever happened to it as many were discarded.
I am more confused to why you have what looks like a 3 groove pulley on your water pump?  Maybe I can't see it right in the pics?  Was that added later?  I don't have it.  If I can get pictures to upload here I will post some pictures of mine.  My 67 does have the 3 groove cast iron pulley for the crank.  The first pulley groove (inner from the engine out) goes from the crankshaft to the water pump, then the alternator.  The second groove should go from the crank to the water pump up to the air pump.  (Someone routed this on mine to the alternator via a 2 groove pulley on the alternator.)  The third pulley groove goes directly from the crank to the power steering pump.
Does yours have power steering?  According to the A.I.M. page 86, upper right hand corner of the page, it shows the routing.  It doesn't show anywhere a 2 groove pulley for the alternator on any pages.  Someone must have put a 2 groove alternator pulley on mine to make it look better like a smog pump was never installed.  I wish I had an original smog pump for mine with the tubing/lines for originality.  Maybe you would sell me yours?    I would be more interested in that carb you have!   LOL!

[Leon in Mn.]

Another note I forgot to mention........it makes more sense for a single groove pulley on the alternator as the upper radiator hose is very close to the pulley on mine as well.            Heiferduster

[Leon in Mn.]

Camaro belt routing #1

[Leon in Mn.]

Camaro belt routing #2

[Leon in Mn.]

Camaro belt routing #3

[Leon in Mn.]

Camaro engine compartment without the A.I.R. (smog) pump attached.

[Mike S]

 Here are closeups of the belt routing.
 The bottom is a 3 groove cast iron pulley. On the water pump there is a 2-groove pulley, which 2 belts ride on, to drive the alternator and a single groove pulley concatenated to the 2 groove unit with the belt that drives the smog air pump and P/S pump. The spacer on the fan has a P/N of 3857042. Even with a dual alternator pulley there is plenty of space between that and the upper hose. As for the manual not showing a 2 groove pulley, remember that there are several inaccuracies in that manual.
Look at eBay for these pumps. I do see them from time to time. And to think, people used to remove and throw these away and now it's a hot commodity.

Mike

[Leon in Mn.]

Thanks Mike.  I might just nix on putting the smog pump etc. on there again.  I did find out that by looking at your pictures that I have the incorrect air cleaner base, as I don't have the one extra tube for the air pump supply.  Trying to get the right smog pump with attaching $$$ bracket and hoses etc. just make it not fun.  Who knows, maybe I will get happy and keep looking.  For now, it's the 1100696 alternator.  I'll find one in my price range for this car eventually.  It's not that I'm cheap but some of those e pay prices are not what I want to do just now especially for used ones!    I like the originality of your car.  Don't change it!

[Mike S]

 Do you have the original motor in your car? If so what is the engine prefix? Mine is an MZ which designates a K19 equipped motor.
The prefix would indicate if yours came with K19 or not.

Mike

[Leon in Mn.]

Yes.  My engine is the original mz coded.  Built jan 67 at the tonawanda? Spelling? Plant.  It has the exhause manifold holes for the smog pump.  I also have the correct fan spacer 3857042 like you haveback on the car.  I just don't have it installed with the 4 blade fan.  Someone had a five blade flex fan on there.  I put the 4 blade back on but not the spacer.  I need to do that now that I found it.