Cascade Crew

83Z28BlackBetty · Posted: Tue Jun 30, 2009 8:01 pm Post subject: Serp!

Big thanks to John,

should be going in this weekend Very Happy

Before

After

cameron7710 · Posted: Tue Jun 30, 2009 8:18 pm Post subject:

wow sweet!! Very Happy

Al Hasse · Posted: Tue Jun 30, 2009 8:24 pm Post subject:

Looking good!

You still going with a belt driven fan? How's that work with the serp setup?

redlava · Posted: Tue Jun 30, 2009 9:12 pm Post subject:

Good point Al you would have to flip the fan over. I think.....

chevymad · Posted: Tue Jun 30, 2009 9:56 pm Post subject:

Trucks use a belt driven serpentine fan setup. The fan and the fan clutch are made for counterclockwise rotation.

83Z28BlackBetty · Posted: Wed Jul 01, 2009 6:55 am Post subject:

exactly right brandon.

I pulled the fan off a chevy van. But i didn't know the clutch is set up different?! i have the clutch but it doesn't spin very freely so i was going to reuse my old one.

The fan will do until i have time/money to switch to electric.

~JAKE

83Z28BlackBetty · Posted: Wed Jul 01, 2009 6:57 am Post subject:

Oh, i am heading to the junk yard today to find a serp crank pulley. Questions

1) is the serp pulley from the V6 the same as the V8?

2) how in the heck do you get one of these suckers off?

thanks,
~JAKE

91RSVert · Posted: Wed Jul 01, 2009 7:03 am Post subject:

Q1. No they are not. Not even close. (edit, assuming were talking fbody here?)

Q2. With belt still attached (hopefully), crack the center bolt loose. IIRC its 9/16 or 5/8. (v6 is 19mm). Then crack the other 4 bolts loose. Remove belt. Then finish removing bolts. Usually they are stuck on and need to be wacked with a rubber mallet.

I also know the truck pully, and camaro pully are different.

83Z28BlackBetty · Posted: Wed Jul 01, 2009 7:56 am Post subject:

Twilightoptics · Posted: Wed Jul 01, 2009 10:27 am Post subject:

Should be some tension to spinning the fan. It's not like a bearing, it's a clutch. Friction.

83Z28BlackBetty · Posted: Wed Jul 01, 2009 10:44 am Post subject:

thanks for clutch fan info, Paul

so now all i need to know is, Would the crank pulley off a 1990-ish non vortec suburban work? or one off a big chevy van?

~JAKE

91RSVert · Posted: Wed Jul 01, 2009 11:06 am Post subject:

I "think" I may have a crank pully off a 02 express van.

v6 fbody to v8 fbody is bolt pattern and size.

now since your latest post makes me think 4.3 to 305/350. They may be the same.

91RSVert · Posted: Wed Jul 01, 2009 11:14 am Post subject:

aspracing says 4.3/305/350 is same crank pully

http://www.aspracing.com/gm.htm

83Z28BlackBetty · Posted: Wed Jul 01, 2009 12:17 pm Post subject:

So as long is as its off a sbc and the bolt pattern is the standard 3 perimeter and one center, i should be fine?

chevymad · Posted: Wed Jul 01, 2009 5:04 pm Post subject:

I think any TBI motor from 4.3l up to 5.7 will work for ya.

83Z28BlackBetty · Posted: Thu Jul 02, 2009 9:23 pm Post subject:

yeah i was able to get a serp pulley off a suburban today and I already have the whole front of my engine disassembled. Its starting to come along nicely!

~JAKE

83Z28BlackBetty · Posted: Mon Jul 06, 2009 7:30 am Post subject:

ok so the swap itself went fairly painless. although now i have a problem.

the crank pulley is offset towards the engine by 3/8 of an inch! it is not in the same plane as the rest of the pulleys so i'm super confused as to why? the pulley is the same size as my old one but it needs to be shimmed out away from the engine by about 3/8s. anyone know why this may be the case?

I've checked it over a dozen times now with the same result so don't tell me to just check again Laughing

~JAKE

blue89 · Posted: Mon Jul 06, 2009 8:31 am Post subject:

Going on a limb here, but I bet it's cause you pulled it from a suburban? I would think you would need to pull the entire setup from the donor vehicle. You just pulled the crank pulley? Maybe you should check to see if the suburban has a bigger harmonic balancer?

83Z28BlackBetty · Posted: Mon Jul 06, 2009 9:08 am Post subject:

hmm... that is a thought. I'll check that. but the serp pulley and my old vbelt pulley were the same size, so does that mean that i have a smaller harmonic balancer?

to remedy this problem i have made a spacer to move the pulley out to where it will line up. Once i get the longer bolts it should work. Does this sound like a bad idea to anyone?

~JAKE

Twilightoptics · Posted: Mon Jul 06, 2009 10:48 am Post subject:

Spacer is fine. Just make sure the spacer fits the round center hole of the pulley nice and tight, because that center bolt in the crank needs that's support to lock down.