Depends. On my '82 240, I had to remove the other bracket that is bolted to the block. One of the bolts came out from the back, but there wasn't enough clearance to get it out. When I finally got the alt out, I used a different bolt, and installed from the front, double nutting the back, so it can't work it's way out.
I did not remove any hoses.
But, what a pain.
Most of the "L" adjuster bolts are bent at the end.

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83 SD

84 CD