NSW Corvettes

Restoration & Modification Projects => Modification Projects => Topic started by: Cameron 77C3 on November 28, 2005, 08:59:17 PM

Title: Idler Pulley and bracket finished
Post by: Cameron 77C3 on November 28, 2005, 08:59:17 PM

Following on from my last post on the steering.

If ya recall I had a problem with the alternator belt hitting the new power steering pump and was going to machine up and idle pulley and bracket.

I purchaced the idler pulley from the local bearing supplier and had the bracket machined up.

The new idler pulley is bolted to the Billet Specialities Alternator Bracket using this bracket machined from billet aluminium. It was machined to follow the contours of the alternator bracket to ensure that it sat flat and did not rock. It is held in place by a single bolt that goes through it and the alternator bracket and into the head. Small tabs that resulted from the machining process act as location tabs and prevent it from turning on the alternator bracket during bolt up.

(http://www.corvettevalley.com/gallery/data/510/medium/099_Idler_Pulley_Bracket01.JPG)

(http://www.corvettevalley.com/gallery/data/510/medium/102_Idler_Pulley_Bracket04.JPG)

(http://www.corvettevalley.com/gallery/data/510/medium/103_Idler_Pulley_Bracket05.JPG)

(http://www.corvettevalley.com/gallery/data/510/medium/105_Idler_Pulley_Bracket07.JPG)



As you can see here the pulley belt now clears the power steering pump with room to spare

(http://www.corvettevalley.com/gallery/data/510/medium/106_Idler_Pulley_Bracket08.JPG)



Here you can just see the location tab sitting in the valley of the Alternator Bracket

(http://www.corvettevalley.com/gallery/data/510/medium/107_Idler_Pulley_Bracket10.JPG)

Title: Idler Pulley and bracket finished
Post by: MADVET on November 28, 2005, 09:38:41 PM

Great piece of engineering Cam. It also increases the belts' surface area against the crank and alternator pulley reducing the chance of it slipping.:v

Title: Idler Pulley and bracket finished
Post by: TIPPA on November 29, 2005, 12:57:59 PM

What a great solution! Looks factory too. Is the pulley bearing an interference fit on the bracket?

Title: Idler Pulley and bracket finished
Post by: 69 DIRTY RAT on November 29, 2005, 10:46:48 PM

Your up yourself!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!;41
Its very good!:spook

Title: Idler Pulley and bracket finished
Post by: Cameron 77C3 on December 01, 2005, 09:49:33 PM

Quote

Originally posted by TIPPA
What a great solution! Looks factory too. Is the pulley bearing an interference fit on the bracket?

Hi Tippa.  No the pulley is a slip fit.  The spigot that the pulley fits on is a few thou shorter than the thickness of the bearing.  When the the locking bolt is done up tight the large flat washer under the bolt head clamps the bearing up against the back of the bracket.  This ensures it does not spin on the spigot and when it comes time to replace it no bearing pulleys will be required.  Allows for easy replacement out on the road.

Quote

Originally posted by 69 DIRTY RAT
Your up yourself!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!;41
.....................:spook

:v:};);35:bold:) ;-- ;39;39

Title: Idler Pulley and bracket finished
Post by: MJ427 on December 08, 2005, 07:24:48 AM

your doing  a great job cam;)