Belt not lining up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**bigunde** · 12-07-2010, 10:32 AM

well i have decided to keep that 86 C-20 and now that im driving it alot, im noticing the serp belt for the alt, fan, and crank it not exactly lining up. the smog pump pulley has been removed so it just those three pullys now but the more i drive it, the more a quarter of the serp belt wants to ride up on the back of the crank pulley. Any ideas? It has the 454

*78 Chevyrado* · 12-07-2010, 11:37 AM

Use shims or spacers to line up the parts/pulleys that are too far rearward. Use a straight edge on the front of the pulleys to line them up and get the angle right.

If you do put any spacers on the pulleys themselves, make sure they are PRECISELY the same (weight and thickness wise) and won't make it wobble or be off balance.

jitteryguy · 12-07-2010, 01:39 PM

my 454 was like that too, the balancer was not install'd all the on the crank . it would eat bout 1/4" off the belt .

allengator · 12-07-2010, 03:07 PM

Quote:

Originally Posted by jitteryguy

my 454 was like that too, the balancer was not install'd all the on the crank . it would eat bout 1/4" off the belt .

x2!!!

I would pull the balancer off, clean and lube the crank snout and key area.
Reinstall using a balancer installation tool (NOT a hammer or trying to drive it on with the attachment bolt!)
I bet everything lines up then!

A balancer not installed properly can get loose and break the crankshaft...
Dont ask how I learned this!!

Oh... you can usually rent the installation tool cheap!

allengator · 12-07-2010, 03:19 PM

OH... one more thing... when you removed the smog pump, did you replace it with the "dummy pully assembly"
If not, the belt tension may not be enough to keep the belt straight!

**bigunde** · 12-07-2010, 09:27 PM

Quote:

Originally Posted by jitteryguy

my 454 was like that too, the balancer was not install'd all the on the crank . it would eat bout 1/4" off the belt .

Thats exactly what this one is doing.

**bigunde** · 12-10-2010, 04:46 PM

Would this installer work? I dont currently own one

http://cgi.ebay.com/ebaymotors/ws/eB...m=400177403807

**bigunde** · 12-10-2010, 05:00 PM

i bought this one

http://cgi.ebay.com/ebaymotors/ws/eB...3011&viewitem=

allengator · 12-10-2010, 05:05 PM

Quote:

Originally Posted by bigunde

i bought this one

http://cgi.ebay.com/ebaymotors/ws/eB...3011&viewitem=

That will do the trick!!
Posted via Mobile Device

**bigunde** · 12-11-2010, 07:43 AM

Quote:

Originally Posted by allengator

That will do the trick!!
Posted via Mobile Device

Thank ya sir!!!!!

jitteryguy · 12-11-2010, 09:34 AM

let us know if thats what it was ! Hope it's nothen more serious .

12-07-2010, 10:32 AM	#1
bigunde Rusty Rockerfeller Join Date: May 2003 Location: South Georgia Posts: 1,631	Belt not lining up well i have decided to keep that 86 C-20 and now that im driving it alot, im noticing the serp belt for the alt, fan, and crank it not exactly lining up. the smog pump pulley has been removed so it just those three pullys now but the more i drive it, the more a quarter of the serp belt wants to ride up on the back of the crank pulley. Any ideas? It has the 454

12-07-2010, 11:37 AM	#2
78 Chevyrado Account Suspended Join Date: Dec 2007 Location: Unnapreciative, Trollville Posts: 2,079	Re: Belt not lining up Use shims or spacers to line up the parts/pulleys that are too far rearward. Use a straight edge on the front of the pulleys to line them up and get the angle right. If you do put any spacers on the pulleys themselves, make sure they are PRECISELY the same (weight and thickness wise) and won't make it wobble or be off balance. Last edited by 78 Chevyrado; 12-07-2010 at 02:18 PM.

12-07-2010, 01:39 PM	#3
jitteryguy GoatLube Experss Join Date: Oct 2009 Location: clarksville, Tn. Posts: 1,337	Re: Belt not lining up my 454 was like that too, the balancer was not install'd all the on the crank . it would eat bout 1/4" off the belt . __________________ *Goat Lube Express*, locations in Qalat,Afghanistan & Clarksville, Tn. '87 R30 dually 454/TH400 '85 1/2 ton CCSB '92 S10 350/350 '84 MonteCarlo 383/PG/9"ford '78 Malibu wagon 350/350 '78 Cutlass (project family car) '96 S10 Jimmy (Moma's)

12-07-2010, 03:19 PM	#5
allengator Registered User Join Date: Dec 2010 Location: Burleson, Texas Posts: 596	Re: Belt not lining up OH... one more thing... when you removed the smog pump, did you replace it with the "dummy pully assembly" If not, the belt tension may not be enough to keep the belt straight! __________________ Allengator Outta the Blue (my band - available for hire in the DFW area!) 1980 Chevy SWB Pickup (build thread) 1951 Chevy Sedan Delivery 2004 Chevy Tahoe Z71 2011 Harley Davidson Street Glide 2018 Silverado Z71 Crew Cab Last edited by allengator; 12-07-2010 at 03:21 PM.

12-10-2010, 04:46 PM	#7
bigunde Rusty Rockerfeller Join Date: May 2003 Location: South Georgia Posts: 1,631	Re: Belt not lining up Would this installer work? I dont currently own one http://cgi.ebay.com/ebaymotors/ws/eB...m=400177403807

12-10-2010, 05:00 PM	#8
bigunde Rusty Rockerfeller Join Date: May 2003 Location: South Georgia Posts: 1,631	Re: Belt not lining up i bought this one http://cgi.ebay.com/ebaymotors/ws/eB...3011&viewitem=

12-11-2010, 09:34 AM	#11
jitteryguy GoatLube Experss Join Date: Oct 2009 Location: clarksville, Tn. Posts: 1,337	Re: Belt not lining up let us know if thats what it was ! Hope it's nothen more serious . __________________ *Goat Lube Express*, locations in Qalat,Afghanistan & Clarksville, Tn. '87 R30 dually 454/TH400 '85 1/2 ton CCSB '92 S10 350/350 '84 MonteCarlo 383/PG/9"ford '78 Malibu wagon 350/350 '78 Cutlass (project family car) '96 S10 Jimmy (Moma's)



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