Pulley Alignment

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plumkrazee70

plumkrazee70

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My 69 340 has a 6 7/8 water pump pulley and a 6 1/2 crank pulley, currently. The car isn't running yet, but I am in the process of adding classic auto air and would rather figure the correct pulleys, for the best cooling, now than later.

I have a 5 3/4 water pump pulley in my stash, however it is shorter than my current one, so it doesn't line up perfectly with the crank pulley, it is close though.

What is the best way to shim the crank pulley forward, Can I put some washer behind it and use a little longer bolt?

Thanks in advance.
 
Depending on how much you are out, here is an eighth inch one. Mancini Racing Crankshaft Pulley Spacer Sometimes you still have to add water pump pulley shims if your crank shim goes moves everything out too far and then shim everything else accordingly.
 
Garrett Ellison said:
Depending on how much you are out, here is an eighth inch one. Mancini Racing Crankshaft Pulley Spacer Sometimes you still have to add water pump pulley shims if your crank shim goes moves everything out too far and then shim everything else accordingly.
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Gotcha! Thank you. I need to get an accurate measurement of the height differences in the two pulleys I have.
 
Indeed! And it's better if you only have to shim the crank pulley. You could get a shim that's close enough and get your favorite friendly machinist to mill or Blanchard grind it to the thickness you need. (EDIT) You'll probably have to space the alternator out the same amount, too, but some washers between the alternator mounting brackets and the main alternator bolt work. Fastenal is your best friend.
 
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Garrett Ellison said:
Indeed! And it's better if you only have to shim the crank pulley. You could get a shim that's close enough and get your favorite friendly machinist to mill or Blanchard grind it to the thickness you need. (EDIT) You'll probably have to space the alternator out the same amount, too, but some washers between the alternator mounting brackets and the main alternator bolt work. Fastenal is your best friend.
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Sounds good. We have a Hubbard's with an amazing selection of spacers and washers.
 
plumkrazee70 said:
My 69 340 has a 6 7/8 water pump pulley and a 6 1/2 crank pulley, currently. The car isn't running yet, but I am in the process of adding classic auto air and would rather figure the correct pulleys, for the best cooling, now than later.

I have a 5 3/4 water pump pulley in my stash, however it is shorter than my current one, so it doesn't line up perfectly with the crank pulley, it is close though.

What is the best way to shim the crank pulley forward, Can I put some washer behind it and use a little longer bolt?

Thanks in advance.
Click to expand...

At one point I made a 3/16 alum. shim in my lathe and used longer bolts , till I came up w/ my currant combo.
u should probly use at least the same size pulleys on the pump and crank (1 to 1) , smaller on the pump for more pump speed -----------------
 
Do you have a 70-up aluminum pump or a 69-down cast Iron pump? Easy way to tell is the pump outlet is on the passenger side of the engine for the aluminum and on the drivers for the Iron. They both use a different pulley. Then there are is everything from 1 belt to 4 belt damper pulleys. What are you working with? Some pics would really help.
 
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If u lay about 1/2" rod in the valley of a pulley you can get the proper alignment for the next pulley and shim accordingly.
 
Mount all pulleys and see which ones are too short/long. That tell you which direction you will go.
 
dano said:
Do you have a 70-up aluminum pump or a 69-down cast Iron pump? Easy way to tell is the pump outlet is on the passenger side of the engine for the iron and on the drivers for the aluminum. They both use a different pulley. Then there are is everything from 1 belt to 4 belt damper pulleys. What are you working with? Some pics would really help.
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I have the 70 up wp and crank. According to the pulley ID thread. My WP exits on the passenger side. I don't have ps and my AC is aftermarket.

I found this 3 grooved crank pulley. It lines everything up, but the wp pulley is awfully close to it. It doesn't hit though. I would just need longer belts.

IMG_20191201_162843261.jpg


IMG_20191201_164012871.jpg


IMG_20191201_164002517.jpg
 
Care to grab the feeler gauges and measure how much clearance you have between the water pump and crank pulley? I would be weary of any less than an .100 inch.
 
I think your water pump pulley maybe is incorrect. It looks to be a 69-down or b/rb. CVF has some info on pulley's. Might check their site.

I was incorrect, the 70-up water pump exits on the passenger side. The 69-down on the drivers.
 
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Garrett Ellison said:
Care to grab the feeler gauges and measure how much clearance you have between the water pump and crank pulley? I would be weary of any less than an .100 inch.
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I can check that tomorrow. I may just run what I originally have and see what happens. It all lines up and clears fine, but the wp is bigger than the crank.

My WP and crank are correct match for 70 according to this thread: Pulley ID thread
 
Besides I don't need a 3 groove crank. I only need a one groove, the AC came with a pulley that bolts to the crank.
 
dano said:
I think your water pump pulley maybe is incorrect. It looks to be a 69-down or b/rb. CVF has some info on pulley's.
Click to expand...

I agree...the sb has more of a bell shape, bb more square straight shouldered.
 
plumkrazee70 said:
I can check that tomorrow. I may just run what I originally have and see what happens. It all lines up and clears fine, but the wp is bigger than the crank.

My WP and crank are correct match for 70 according to this thread: Pulley ID thread
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Don't do that. You will be under driving the water pump and that is bad.

Also, not sure about that 3 groove lower pulley but I've never seen on that can be balanced and someone was drilling on that thing. I set that aside and try something different.

FWIW there are now several companies making pulleys that are relatively inexpensive and you can get pretty much what you want.

Whatever you do, the water pump pulley MUST be smaller than the crank pulley. An absolute must if you want a cooling system to do its job.

Correctly sized radiator.
Good high volume water pump.
Quality high flow thermostat (Stewart Components).
Water pump turning at least 5% over and 10% is much better.

You do that and you'll keep your engine cool in the bowels of hell.
 
Jimacuda said:
I agree...the sb has more of a bell shape, bb more square straight shouldered.
Click to expand...
yellow rose said:
Don't do that. You will be under driving the water pump and that is bad.

Also, not sure about that 3 groove lower pulley but I've never seen on that can be balanced and someone was drilling on that thing. I set that aside and try something different.

FWIW there are now several companies making pulleys that are relatively inexpensive and you can get pretty much what you want.

Whatever you do, the water pump pulley MUST be smaller than the crank pulley. An absolute must if you want a cooling system to do its job.

Correctly sized radiator.
Good high volume water pump.
Quality high flow thermostat (Stewart Components).
Water pump turning at least 5% over and 10% is much better.

You do that and you'll keep your engine cool in the bowels of hell.
Click to expand...

Thanks, sir! I have a champion/eagle 3 row 1" tube radiator, planning on the Stewart thermostat also. The lower pulley came off a 318, but who knows the origin.

I'll do some searching on the pulleys. Do you have a link to a company?
 
Okay, Thanks! I looked at CFV and they were all under driven with V belt pulleys. March performance only made direct or under driven V belt the last time I checked with them. CFV has a water pump and alternator only drive with an 8 rib serpentine kit that I've called about to confirm pulley diameters. It runs 20% overdrive to the fan and water pump. Where you have a separate crank pulley for your AC I don't see it being an option, but it's the highest overdrive ratio kit out there at the present. Chrysler Small Block Engine Accessories | Serpentine Conversion
 
Garrett Ellison said:
Okay, Thanks! I looked at CFV and they were all under driven with V belt pulleys. March performance only made direct or under driven V belt the last time I checked with them. CFV has a water pump and alternator only drive with an 8 rib serpentine kit that I've called about to confirm pulley diameters. It runs 20% overdrive to the fan and water pump. Where you have a separate crank pulley for your AC I don't see it being an option, but it's the highest overdrive ratio kit out there at the present. Chrysler Small Block Engine Accessories | Serpentine Conversion
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I appreciate it I don't want spend that kind of money. Lol. Well see what shakes out of the want ad.
 
I agree completely, I can think of a lot better things to spend that much on at the present, too!
 
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