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  #1  
Old 06-07-2022, 08:28 AM
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M62 drive belt pulley size

I have been gathering components for a main drive belt, A/C belt, pulley, belt tensioner, water pump, thermostat + couple of coolant pipe replacement. So far I have or have on the way all the parts I want except for the drive belt pulleys and tensioners. Tensioners seems to be quite a straightforward, just have to be careful with the A/C belt's tensioner, since apparently the part number differs from the one in 4.4 M62 and there seems to be no alternatives for a BMW original part.

The ones I'm still thinking about are the pulleys. I was able to find one complete assembly for main drive belt pulleys + tensioner so that should be fine, but then there is still the A/C belt pulley which I would need. I wouldn't prefer to buy the BMW original part, so I'm looking for an aftermarket pulley. I currently have hard time finding the correct part, but when I do find it, I would like to be sure it really does fit, so does anyone know the dimensions of the A/C belt pulley? I would be also interested in the dimensions of the main belt pulleys if I'm not going with complete assembly for that. Or are all three (two for the main belt and one for the A/C) the same? Or if anyone happens knows some manufacturers part number for the correct pulley.

Car is 4.6is but the pulleys should be same as in M62 4.4.
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  #2  
Old 06-07-2022, 09:04 AM
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Not really sure why all other pulley system parts on M62 variants are the same except the AC tensioner piston. INA is OEM manufacturer even they have stopped delivering that piston for after market. Mainly all AC pulley parts come as package with tensioner piston included. Some like Febi seems to offer the same AC pulley system for both versions.

https://aftermarket.schaeffler.com/e...257EBelt+Drive
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Old 06-07-2022, 09:19 AM
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Just went through this with my 4.4 to 4.6 motor swap. Real OEM shows the same “ climate control” belt and pulley assembly for the 4.4 and 4.6. The belt on the other side (alternator, h2o pump etc) is a different size however. I will caveat this though by saying I selected the latest 4.6 motor build possible on real OEM, since mine was assembled in 2017. I’d be surprised if earlier 4.6 motors had a different harmonic balancer/crank pulley though.

The crank pulley is an underdrive piece on the 4.6 for the alternator, water pump, and power steering side, but not for the ac (same diameter as the 4.4). The tensioner pulleys on both sides are identical. The crank pulley/harmonic balancer has a different diameter (smaller), but only for the main accessories, not for the ac. Supposedly this is good for 8 to 10 more HP. Who knows. I do know guys run the 4.4 set up on there 4.6 motor swaps (into 540s) to save money, if they were facing having to buy a new 4.6 balancer. They are very hard to find used and expensive new. I can say that there are a different number of balancing holes drilled into the 4.6 balancer as the 4.4, so I wonder if their cranks are out of balance.

I bought new pulley refresh kits for both sides from somewhere (can’t remember, but will look if you need me to). Use at your own risk however as the main accessory belt was wrong and had to be exchanged (4.4 instead of 4.6) and the nut holding the belt tensioner on was improperly torqued, which bit me hard later because I was in a hurry, threw it on the motor and didn’t check it over well.
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Last edited by Henn28; 06-07-2022 at 09:29 AM.
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Old 06-07-2022, 10:01 AM
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Quote:
Originally Posted by Clavurion View Post
Not really sure why all other pulley system parts on M62 variants are the same except the AC tensioner piston. INA is OEM manufacturer even they have stopped delivering that piston for after market. Mainly all AC pulley parts come as package with tensioner piston included. Some like Febi seems to offer the same AC pulley system for both versions.

https://aftermarket.schaeffler.com/e...257EBelt+Drive
Seems like INA is not even offering the pulley for the A/C belt, the one marked in the attached picture. Febi/Swag also seems to only offer the main belt pulley assembly, but in most places it seems to be out of stock somehow. Same seems to apply to INA version too.

Quote:
Originally Posted by Henn28 View Post
Just went through this with my 4.4 to 4.6 motor swap. Real OEM shows the same “ climate control” belt and pulley assembly for the 4.4 and 4.6. The belt on the other side (alternator, h2o pump etc) is a different size however. I will caveat this though by saying I selected the latest 4.6 motor build possible on real OEM, since mine was assembled in 2017. I’d be surprised if earlier 4.6 motors had a different harmonic balancer/crank pulley though.

The crank pulley is an underdrive piece on the 4.6 for the alternator, water pump, and power steering side, but not for the ac (same diameter as the 4.4). The tensioner pulleys on both sides are identical. The crank pulley/harmonic balancer has a different diameter (smaller), but only for the main accessories, not for the ac. Supposedly this is good for 8 to 10 more HP. Who knows. I do know guys run the 4.4 set up on there 4.6 motor swaps (into 540s) to save money, if they were facing having to buy a new 4.6 balancer. They are very hard to find used and expensive new. I can say that there are a different number of balancing holes drilled into the 4.6 balancer as the 4.4, so I wonder if their cranks are out of balance.

I bought new pulley refresh kits for both sides from somewhere (can’t remember, but will look if you need me to). Use at your own risk however as the main accessory belt was wrong and had to be exchanged (4.4 instead of 4.6) and the nut holding the belt tensioner on was improperly torqued, which bit me hard later because I was in a hurry, threw it on the motor and didn’t check it over well.
Actually, I initially made just that mistake and ordered the wrong main belt. Then saw your old messages regarding the PK7X1623 vs. PK7X1635 belt, the correct one is now on the way.

And just to clarify the bolded part in your message, do you mean the two alternator and water pump belt pulleys and the one A/C belt pulley are all identical?

I wonder if they are available separately somewhere?
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Old 06-07-2022, 01:16 PM
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Quote:
Originally Posted by SamW View Post
Seems like INA is not even offering the pulley for the A/C belt, the one marked in the attached picture. Febi/Swag also seems to only offer the main belt pulley assembly, but in most places it seems to be out of stock somehow. Same seems to apply to INA version too.



Actually, I initially made just that mistake and ordered the wrong main belt. Then saw your old messages regarding the PK7X1623 vs. PK7X1635 belt, the correct one is now on the way.

And just to clarify the bolded part in your message, do you mean the two alternator and water pump belt pulleys and the one A/C belt pulley are all identical?

I wonder if they are available separately somewhere?
I just did a deeper dive into RealOEM to double check what I seemed to recall, and confirmed that the "Belt Drive" pulley/tensioner assembly for the water pump, alternator and steering pump are identical for the 4.4 and 4.6 engines. On the AC side, the pulley is the same (single pulley on this belt drive) but the tensioner is a different part number for the 4.6 than it is for the 4.4.

Oddly, the ac drive belts are the same part number for the two motors. This doesn't make any sense to me why the tensioners on the AC side would be different, but the belts and pulleys would be the same. I checked the compressors and pulleys and they are the same part number too (pulley and compressor are sold as one unit).

At any rate, I ordered two complete "refresh kits" from Bimmerworld, one for the AC and one for the main drive. This was the kit that showed up with poorly torqued fasteners and the wrong main drive belt initially. I didn't not check the part numbers on the AC tensioner they used either, so who knows if it was the 4.6 specific piece. Once again though, I can't see a reason for this tensioner to be different between the two motors. My AC is running without problems though with whatever they sent me. Ironically it was the poorly assembled main belt tensioner assembly they sent (and I just tossed on without checking over) that caused a lot of problems.
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Old 06-07-2022, 02:46 PM
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Quote:
Originally Posted by Henn28 View Post
I just did a deeper dive into RealOEM to double check what I seemed to recall, and confirmed that the "Belt Drive" pulley/tensioner assembly for the water pump, alternator and steering pump are identical for the 4.4 and 4.6 engines. On the AC side, the pulley is the same (single pulley on this belt drive) but the tensioner is a different part number for the 4.6 than it is for the 4.4.

Oddly, the ac drive belts are the same part number for the two motors. This doesn't make any sense to me why the tensioners on the AC side would be different, but the belts and pulleys would be the same. I checked the compressors and pulleys and they are the same part number too (pulley and compressor are sold as one unit).

At any rate, I ordered two complete "refresh kits" from Bimmerworld, one for the AC and one for the main drive. This was the kit that showed up with poorly torqued fasteners and the wrong main drive belt initially. I didn't not check the part numbers on the AC tensioner they used either, so who knows if it was the 4.6 specific piece. Once again though, I can't see a reason for this tensioner to be different between the two motors. My AC is running without problems though with whatever they sent me. Ironically it was the poorly assembled main belt tensioner assembly they sent (and I just tossed on without checking over) that caused a lot of problems.
Just checked and the pulley/tensioner assemblies in the Bimmerworld are made by INA. Since yours is running fine with a "wrong" tensioner and neither do I see any reason why the M62B44 and M62B46 A/C belt systems would require are different tensioners even though the belts and pulleys are identical, maybe I'll go with an INA pulley/tensioner assembly. Just have to source it from somewhere else other than Bimmerworld since shipping and taxes to Europe would kill the deal.
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Old 06-07-2022, 04:11 PM
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Quote:
Originally Posted by Henn28 View Post
Just went through this with my 4.4 to 4.6 motor swap. Real OEM shows the same “ climate control” belt and pulley assembly for the 4.4 and 4.6. The belt on the other side (alternator, h2o pump etc) is a different size however. I will caveat this though by saying I selected the latest 4.6 motor build possible on real OEM, since mine was assembled in 2017. I’d be surprised if earlier 4.6 motors had a different harmonic balancer/crank pulley though.

The crank pulley is an underdrive piece on the 4.6 for the alternator, water pump, and power steering side, but not for the ac (same diameter as the 4.4). The tensioner pulleys on both sides are identical. The crank pulley/harmonic balancer has a different diameter (smaller), but only for the main accessories, not for the ac. Supposedly this is good for 8 to 10 more HP. Who knows. I do know guys run the 4.4 set up on there 4.6 motor swaps (into 540s) to save money, if they were facing having to buy a new 4.6 balancer. They are very hard to find used and expensive new. I can say that there are a different number of balancing holes drilled into the 4.6 balancer as the 4.4, so I wonder if their cranks are out of balance.

I bought new pulley refresh kits for both sides from somewhere (can’t remember, but will look if you need me to). Use at your own risk however as the main accessory belt was wrong and had to be exchanged (4.4 instead of 4.6) and the nut holding the belt tensioner on was improperly torqued, which bit me hard later because I was in a hurry, threw it on the motor and didn’t check it over well.
Out of interest is the rev limit higher on 4.6i?
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Old 06-08-2022, 09:12 AM
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Quote:
Originally Posted by Clavurion View Post
Out of interest is the rev limit higher on 4.6i?
The 4.6 redline is bumped to 6500, or maybe it’s 7000. The progressive lights on the tach wink out as the transmission oil warms up. Amber stays lit at 6500 and red at 7k when the car is fully warmed up. My limited understanding is that you don’t get much extra from the M62 family though at high rpm, due to the crappy exhaust headers?

I’m running the 4.4 ZF transmission in my X so I don’t go deep into the tach anyway. There is a high torque rebuild kit someone offers for the 5hp24 that maybe I’ll do someday, but right now it’s fairly fresh from a rebuild 3 years ago when the car had the 4.4 in it. My combination of 4.4 car and 4.6 motor seems to have a sweet spot between 2500 and say 4800 RPM. The 4.4 diffs and torque converter probably slow it a bit “off the line”, but the motor and long runner intake along with the mild 4.6 tuned DME come on really hard at 2500ish. The intake roar is great at that point too, but the exhaust is a bit muted for a project car.
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Last edited by Henn28; 06-08-2022 at 09:18 AM.
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Old 06-08-2022, 09:32 AM
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Quote:
Originally Posted by Henn28 View Post
The 4.6 redline is bumped to 6500, or maybe it’s 7000. The progressive lights on the tach wink out as the transmission oil warms up. Amber stays lit at 6500 and red at 7k when the car is fully warmed up. My limited understanding is that you don’t get much extra from the M62 family though at high rpm, due to the crappy exhaust headers?

I’m running the 4.4 ZF transmission in my X so I don’t go deep into the tach anyway. There is a high torque rebuild kit someone offers for the 5hp24 that maybe I’ll do someday, but right now it’s fairly fresh from a rebuild 3 years ago when the car had the 4.4 in it. My combination of 4.4 car and 4.6 motor seems to have a sweet spot between 2500 and say 4800 RPM. The 4.4 diffs and torque converter probably slow it a bit “off the line”, but the motor and long runner intake along with the mild 4.6 tuned DME come on really hard at 2500ish. The intake roar is great at that point too, but the exhaust is a bit muted for a project car.
The point I was thinking if the smaller diameter vibration damper was designed because of higher rev limit and not letting for example alternator going too high revs.
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Old 06-09-2022, 08:50 AM
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Originally Posted by Clavurion View Post
The point I was thinking if the smaller diameter vibration damper was designed because of higher rev limit and not letting for example alternator going too high revs.
Ahhh, that could make sense. Everything I’ve read though is that the underdrive balancer is to gain a few more hp. But who knows what the official BMW reason was.
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