darkbreeze
Forum Newbie
Posts: 4
Reg: 08-09-12
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08-09-12 11:17 PM - Post#2257766
Greetings to you all. I've got a little problem and was hoping one of you can help out. I've got a 1966 327 I just rebuilt for somebody and have issues with the pulley alignment. I realize this is not uncommon when parts from different years get slapped together, however, my water pump pulley, chevy #3788472, and crankshaft pulley, #3755820, are apparently correctly matched and should work together from what I can find via google and some forum entries. However, the waterpump pulley is about a quarter inch further away from the engine than either the crankshaft pulley or the alternator pulley. According to the engine owner the waterpump is the same one that was on the engine when he purchased the engine used but I'm wondering if possibly the snout length could be the issue. The waterpump looks as though it has been on the engine for quite some time but this engine was recovered from the back of a barn so there's no telling. The water pump is GM 3853926. The alternator is on the right hand side of the engine if you're looking at it from the front of the engine and to be honest, I don't work on these older engines a whole lot and I'm not certain whether the alternator is supposed to mate on the front or rear of it's upper bracket arm. Either way, with it behind the bracket it aligns with the crank pulley but neither the crank or alt align with the water pump pulley. If I move the alt to the front and bolt it to the bracket from the rear it appears to line up with where the water pump pulley is but then neither one aligns with the crank pulley. Any clarification on what's wrong would be so appreciated. Thanks.
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 jumbojim
"2nd Year" Platinum Supporting Member
Posts: 315
Age: 66
Loc: Melbourne, Australia
Reg: 09-25-11
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08-10-12 04:26 AM - Post#2257782
In response to darkbreeze
Crank pulley is correct for '65-'68 small block.
Water pump pulley may be from a big block. The alternator is on the correct side. It was changed in '69 along with a longer water pump and pulley which may also be your problem. You should be using a short water pump and pulley, the back of the short pump almost contacts the timing cover. Jim
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Jays 65 Super Sport
Forum Newbie
Posts: 46
Loc: Canada
Reg: 01-03-11
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08-10-12 05:04 AM - Post#2257788
In response to jumbojim
Jumbo Jim is correct
Here's a picture that might help you from my 327 engine after rebuild :
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55 Shaker
Member
Posts: 1043
Age: 63
Loc: north central IL.
Reg: 03-13-06
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08-10-12 10:44 AM - Post#2257868
In response to Jays 65 Super Sport
My friend and I both ran into this problem. We're both running a SBC with a short water pump, single groove pullies top and bottom. Crank and alt. would line up but the water pump would not. So we took the cover off of the back of the water pump, put the pump in a press and pressed the pully mount farther onto the shaft. Now every thing lines up like it should.
| The older I get, the more dangerous, I am !!!! |
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darkbreeze
Forum Newbie
Posts: 4
Reg: 08-09-12
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08-10-12 11:28 AM - Post#2257877
In response to 55 Shaker
Well, that's what I had to do although I don't understand why you should have to do this. Whenever the water pump does get replaced, which may be soon as the bearing has a very slight wobble to it now but does not leak, it will likely have to be done again. Shouldn't have to press the flange in every time the water pump is replaced and I'm sure they didn't have to do that when it was new. Well, whatever gets it done. Everything lines up good now and yes, they were all single groove pulleys. Thanks a bunch guys I probably wouldn't have thought to press the flange further on the pump.
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55 Shaker
Member
Posts: 1043
Age: 63
Loc: north central IL.
Reg: 03-13-06
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08-10-12 05:27 PM - Post#2257958
In response to darkbreeze
I'm with you dark breeze, I don't understand either. My buddy and I both ran into this problem with our 55's a few month's ago. I've been playing around with SBC for almost 50 years(boy I'm getting old) and have never run into this before. That I can remember. 
| The older I get, the more dangerous, I am !!!! |
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dadstoy
Frequent Contributor
Posts: 1057
Age: 59
Loc: Lewisburg Ohio
Reg: 04-01-07
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08-10-12 06:57 PM - Post#2257979
In response to 55 Shaker
Might be a little late but these are the pullys on our 67 Impala 327 with a short pump. Its a double pully but only uses one belt for the alt.
Larry.
1965 Impala convertible 396
1965 Impala 9 pass wagon 283
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darkbreeze
Forum Newbie
Posts: 4
Reg: 08-09-12
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08-10-12 07:52 PM - Post#2257991
In response to 55 Shaker
Hey, just one more thing guys. Since this guy went to headers, instead of using the stock exhaust manifolds, is there a conversion bracket or adapter for the bottom alternator bracket since it used to bolt up to the exhaust manifold but now has nowhere to bolt to? I fabricated a temporary 90 degree adapter that I bolted to the header using the end header bolt location and then to the bottom alternator bracket where it used to bolt to the manifold but I don't feel this is a permanent solution. It works good, but looks like, well, unintended. I even used some good aluminum stock but you can tell. And since there are no accessory bolt holes in the end of these heads, not sure how guys secure these things. Anybody know of a part number for this fix. Thanks.
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dadstoy
Frequent Contributor
Posts: 1057
Age: 59
Loc: Lewisburg Ohio
Reg: 04-01-07
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08-10-12 08:45 PM - Post#2257999
In response to darkbreeze
On the 67 Impala 327 we installed headers. You need these brackets to install the alternator.
http://www.jegs.com/i/Hooker+Headers/520/ 10927/100...
http://www.jegs.com/i/Hooker+Headers/520/ 10928/100...
Larry.
1965 Impala convertible 396
1965 Impala 9 pass wagon 283
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darkbreeze
Forum Newbie
Posts: 4
Reg: 08-09-12
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08-11-12 12:24 AM - Post#2258027
In response to dadstoy
Thanks, that's exactly what I was looking for. Well, engines done. Here's a pic. Turned out ok considering is was mostly a budget build for this guys kids first car. Truck actually. It's going in a restored 66 C-10. As many SB's as I've done in the past, this is actually the first small journal 327 I've done and I'll tell you getting some of the parts, the correct parts, (surprising how often they were wrong even after telling the suppliers it was a SMALL JOURNAL engine), was a real nightmare. In fact, I'll tell you all a little more about this engine after it runs and I can't jinx things. Smile. Anyhow. Thanks for everybody's input and help. It is appreciated. 
Edited by darkbreeze on 08-11-12 12:26 AM. Reason for edit: No reason given.
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slammed1
Contributor
Posts: 676
Age: 42
Loc: Ark
Reg: 03-28-12
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08-11-12 12:49 PM - Post#2258165
In response to dadstoy
DadsToy is right on those brackets and I will add a few more little tid bits.I used those on a few occasions and will most likely use more before I pass away,but have done a few small mods to make things stronger and make belt selection and adjustabilty even better.
I was breaking these lower mounts often so I made my own with thicker metal and didnt use notched holes but actual holes instead around the frt exhaust port.The upper part of the bracket is flat which reduces the amount of adjustability and I found that a factory altenator mount has swept up ears that allows more un obstructed adjusting and bolts to the aftermarket lower mount just as intended.
hard to really explain in type but worked just great made life easier.I can maybe sketch up a drawing in paint if needed.
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