New belt problems....please help

[smallblock450sl]

Originally Posted by Molon Labe

Big block man here is a picture of the belt between the primary clutch. It definitely feels tight. Drives and shifts just fine after I greased the clutch shaft but it's still jumping forward with every crank from the starter. The starter also cranks over very slowly like it's under a load and worked just fine before I replaced everything.

G1's have alway's been a pain to put on and take off the drive belt Did you grease the primary sliding sheave and the secondary sliding sheave bushings? That belt does look "tight" though. With "cut sheave" you are told to get ride of the "plastic washer", did you do that? If so, the secondary IS closing in on the belt more. Good luck on this problem

[Molon Labe]

Yes it has the return spring

[Molon Labe]

Smallblock450sl. I greased the primary shaft and the bushing in the sheave. On the secondary I greased the bushings as well through the zerk fitting on the new sheave. I didn't just remove the nylon washer...I melted it with Mapp gas

[BigBlockMan]

Is it just me or does the primary clutch not look new. It also doesn't appear to be open all the way. Also by belt mark, it's not coming anywhere close to the outer diameter.

[Molon Labe]

Neither the primary or secondary fixed sheaves are new. I only replaced the aluminum movable sheaves and the belt. Starting to wonder if the return springs are shot since the primary isn't opening all the way and secondary isn't closing all the way. They are 34 years old now so I'm thinking they may not be working how they should. Is this a common problem I don't know about and they just need to be replaced? Is there an easy way to test this theory out?

[BigBlockMan]

Thinking maybe something out of place not allowing drive clutch to open all the way?

[Molon Labe]

I tried to pull the primary open more by hand yesterday but it didn't move out any further. Should there be a gap between the belt and sheaves and if so about how much? I may try a spacer of that thickness to see if it compresses the spring more and fixes the jumping while starting problem. Any thoughts?

[BigBlockMan]

Should be .030-.050 clearance

[smallblock450sl]

Please post a picture showing the whole primary clutch, including the outer cover.

[Molon Labe]

Originally Posted by smallblock450sl

Please post a picture showing the whole primary clutch, including the outer cover.

Will do smallblock....I'm hopin to get it apart today in between the rain drops and I'll snap some pictures...haha...need to clean the garage out so I can have my workshop back