77 BJ40 with B engine - adding A/C and need crankshaft pulley with 2 grooves (1 Viewer)

[Samy1969]

Hi all. First time poster and newbie to LC ownership. I bought this vehicle in Costa Rica and had it shipped to Texas. They installed A/C before shipping it to me, then turns out they simply used a longer belt to tie crankshaft, alternator, water pump, and compressor. Needless to say, the battery wasn’t charging, due to the alternator not spinning correctly.

After some research, I’ve learned that the B engines came up single-groove pulleys only. I saw a thread taking about a smaller second groove on pulleys for vehicles in late 60s (IIRC, it was talking about Toyota preparing for updated emissions standards so they added a second smaller pulley). Found some other threads on these pulleys but really am more interested in what options I have to get this fixed. I’m up for buying a pulley, though there may be an issue with the harmonic balancer that requires a custom fit and the vehicle to be present. But at this point, I’ll try anything, short of upgrading to a 3B engine.

Any ideas? Anyone got an extra fabricated pulley or perhaps a pulley that might work?

Here are pictures of my current pulley setup.

Thanks,
Sam

 

[Samy1969]

Oh, forgot to mention that my mechanic added a tensioner to try to fix it. Now the belt squeals like no other when you turn on the A/C. Doesn’t make any noise when A/C is off though, only when it’s on.

 

[DEADSALT]

amazing they reused that belt

once when they added AC
and then ‘your mechanic’

 

[DEADSALT]

after 81/82 can spec 3B’s with power steering came with a double grove

... but a proper new belt the right size is likely the fix.

and that depends on; what A/C was put in, do all the ‘pulleys’ have the same grove, are they aligned...

 

[Samy1969]

With the 4 pulleys and where the A/C was mounted, 2 different mechanics have said it’s not possible for there to be enough tension. The first mechanic welded on a tensioner (you can see it in one of the pics) and he’s the one who found a belt long enough to wrap through the 4 pulleys and the tensioner. He also said the A/C pulley is not aligned correctly.

He then ran out of time to work on the LC, so I took it to a guy who specializes in these vehicles. He seems to be the premier guy in houston for these vehicles. He’s also saying it won’t work with 1 belt on 4 pulleys, and that we need to find a crankshaft pulley with 2 grooves or have one made. He’s very busy so He doesn’t work on my vehicle too often. But man oh man I’d love to get that vehicle out of his shop as it’s been there for 1.5 years!!!

 

[El Gringo Loco]

Oh, forgot to mention that my mechanic added a tensioner to try to fix it. Now the belt squeals like no other when you turn on the A/C. Doesn’t make any noise when A/C is off though, only when it’s on.

I have a B series motor w/ ac & l am looking for a tensioner set up. Is your mechanic still around? I would like to contact him. The tensioner mounting bolts sheared off & the tensioner is now somewhere on I-95. The unit was not mounted with high strength Grade 8 bolts.

 

[anothernz45]

Find a pulley off a Toyota Dyna with 13b in it, they have air con double groove pulleys. The other big issue is it looks like the single belt fitted is an A section, every B I've dealt with uses a B section belt for the alternator and water pump drive, but your air con compressor is probable A. B section transmits a hell of a lot more power.

 

[El Gringo Loco]

Find a pulley off a Toyota Dyna with 13b in it, they have air con double groove pulleys. The other big issue is it looks like the single belt fitted is an A section, every B I've dealt with uses a B section belt for the alternator and water pump drive, but your air con compressor is probable A. B section transmits a hell of a lot more power.

Would you know the serpentine drive belt part number or dimensions for a 77 BJ40 w/ the B series 4 cylinder. I am having a devil of a time find one here in the states.

Cheers!

 

[anothernz45]

Sorry, was answering previous (really old) thread. Mines running a B44 belt, tho all it runs are alternator and water pump. May have to remove bottom alternator bolt to get it on. Here's pics of double pulley and a/c tensioner off a 13b. Looks like your pulley has been turned from billet - 2nd pressed tin pulley bolts to 6 holes in the crank pulley on a B.

 

[El Gringo Loco]

Sorry, was answering previous (really old) thread. Mines running a B44 belt, tho all it runs are alternator and water pump. May have to remove bottom alternator bolt to get it on. Here's pics of double pulley and a/c tensioner off a 13b. Looks like your pulley has been turned from billet - 2nd pressed tin pulley bolts to 6 holes in the crank pulley on a B.

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Thanks for the info on the belt. When you reference "844 belt" is that the part number? I am not to clear on that. I am not running my A/C system at this time and l am only looking for the serpentine belt for the water pump & alternator/air pump. I will post photos once the sun comes up. Thanks for responding. Here's a photo of my beast.

Sorry, was answering previous (really old) thread. Mines running a B44 belt, tho all it runs are alternator and water pump. May have to remove bottom alternator bolt to get it on. Here's pics of double pulley and a/c tensioner off a 13b. Looks like your pulley has been turned from billet - 2nd pressed tin pulley bolts to 6 holes in the crank pulley on a B.

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I think l found the answer. 844mm !!! Ah, the internet.

 

[anothernz45]

Thanks for the info on the belt. When you reference "844 belt" is that the part number? I am not to clear on that. I am not running my A/C system at this time and l am only looking for the serpentine belt for the water pump & alternator/air pump. I will post photos once the sun comes up. Thanks for responding. Here's a photo of my beast.

I think l found the answer. 844mm !!! Ah, the internet.

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Not 844, B 44 - B is the profile size of the belt, 44 is length in inches. Your a/c is running a smaller A profile belt, there's often 2. You may need a 45 inch belt, the 44 is pretty tight on. Nice truck

 

[El Gringo Loco]

Not 844, B 44 - B is the profile size of the belt, 44 is length in inches. Your a/c is running a smaller A profile belt, there's often 2. You may need a 45 inch belt, the 44 is pretty tight on. Nice truck

Thanks for the compliment & clarification!

 

[El Gringo Loco]

Not 844, B 44 - B is the profile size of the belt, 44 is length in inches. Your a/c is running a smaller A profile belt, there's often 2. You may need a 45 inch belt, the 44 is pretty tight on. Nice truck

I run the A/C off the double groove crank pully with a smaller belt.