Smog pump belt???'s

dickeymoore

G-Body Guru
May 6, 2009
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How do I remove the smog pump belt on my 1988 Monte Carlo SS 305 engine, I see the bracket up yop ,do I have to remove the cricket looking brace also?Thanks
 

78Delta88

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I always just used a knife....

From the Monte Carlo forum 2011...

 

78Delta88

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Is yours up top or down low?

I used to work on these at dealership when new, but has been awhile....

You will have to hunt the web, I only found 2 yeah tubes ... Not the best but you can see what they did.

You are in the age range where GM was switching over to single serpentine belt system. Prior to that the air pump was a mounted usually at the lower front on the passenger side. The bottom bracket was usually crescent shaped and was where the adjustment was made.

The pump usually had its own belt typically 3/8 wide. This was also a short belt that just went from the crank pulley to the pump pulley. To remove the pump you need to remove the pulley as the bolt heads are usually behind the pulley and can't be removed until the pulley is removed.

The top bolt was usually a through bolt that mounted the pump to the block and this is the bolt it pivots on. The lower bolt was where the adjustment was made. There also might be a short bolt at the lower back of the unit, and loosened to get the unit to move. You tighten it back up once the adjustment is made.

Can you post a pic of what you have?
 
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78Delta88

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Haynes.Com....


Screenshot_20230910-215636.png
 

78Delta88

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You see where those 3 bolts basically line up? 15 mm hex head? Loosen the bottom one and below there will be another to loosen. Put 1/2 breaker bar or ratchet in that square hole and rotate clock wise ( toward the center of the engine ) and this will allow belt to come off.

Replacement and tensioning of the new belt is the opposite.

You don't have to remove fan. Just remove top section of the shroud and work belt on/off, working over one fan blade at a time.
 

78Delta88

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A few more pics of engine out of vehicle. By these, they should give you idea of what has to be loosened in order to make adjustment and or remove belt.
 

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78Delta88

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Yep, the one in the middle is just the mount for the ground cable. You still might have one or two to loosen at the back of the unit.
 

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