[72projectbird]

Does anyone have a good diagram of how a 79 403 olds Trans Am accessory drive goes together? I got one I'm putting together, and everything was thrown into a box and now I'm playing with a big puzzle. lol

Also, if anyone has a 403 crank pulley, I need one.

Thanks guys!

[Trevor78]

AC or Smog pump originally? Accessories, brackets and pulleys changed due to options.

[Trevor78]

https://forums.maxperformanceinc.com...d.php?t=813887

Here's one from way back, before Parts Manuals and Diagrams were available. Worked it out.

[72projectbird]

Originally Posted by Trevor78

AC or Smog pump originally? Accessories, brackets and pulleys changed due to options.

No ac. I don't know if it had a smog pump originally? It has a 3 groove water pump pulley, and if it did have a smog pump, it won't be going back on.

[72projectbird]

Originally Posted by Trevor78

https://forums.maxperformanceinc.com...d.php?t=813887

Here's one from way back, before Parts Manuals and Diagrams were available. Worked it out.

Wow, that's perfect! Better than a diagram I think.

Thanks!

[Trevor78]

403 Alternator brackets 77_79 A F models by Ben, on Flickr

[Trevor78]

A 3-row water pump pulley with non-AC says possible smog pump engine as 3 accessories still being used or they'd use the 2-row pulley. On Olds engines with smog and AC, the compressor belt would bypass the WP and go to a 4th row on the crank pulley.

With only the 2 accessories remaining it won't matter anyway. These engines had the pulley offsets changed around and with extra rows when the need for extra accessories became more popular. The water pump length became standard rather than different lengths of earlier engines.

Another obvious way to detect a smog 403, other than blocked-off intake fittings and carb used, is the curved oil filler pipe required to clear the smog pump. Regular just used the straight tube. The original accessory status is more for swapping pulleys around and knowing which will line up together even if the accessories are long gone.

[72projectbird]

Originally Posted by Trevor78

A 3-row water pump pulley with non-AC says possible smog pump engine as 3 accessories still being used or they'd use the 2-row pulley. On Olds engines with smog and AC, the compressor belt would bypass the WP and go to a 4th row on the crank pulley.

With only the 2 accessories remaining it won't matter anyway. These engines had the pulley offsets changed around and with extra rows when the need for extra accessories became more popular. The water pump length became standard rather than different lengths of earlier engines.

Another obvious way to detect a smog 403, other than blocked-off intake fittings and carb used, is the curved oil filler pipe required to clear the smog pump. Regular just used the straight tube. The original accessory status is more for swapping pulleys around and knowing which will line up together even if the accessories are long gone.

I have a straight oil fill tube. The engine was rebuilt but never installed in the car, so I'm piecing the accessory drive back together before I drop it in the car. I didn't take it apart, so I have nothing to go off of for reference.

Thanks for the help!