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Re: [GMCnet] 455 Serpentine belt system. [message #78131 is a reply to message #78091] Fri, 26 March 2010 21:09 Go to previous messageGo to previous message
GMCWiperMan is currently offline  GMCWiperMan   United States
Messages: 1248
Registered: December 2007
Karma:
Senior Member
Les,

I keep finding things I haven't addressed for you:

The PS pump return for HydroBoost is not a big deal -- one can easily braze
a return into any of the reservoirs. Almost all of the older pumps like
ours ARE like ours -- it's my strong opinion that there are really only two
similar pumps, those with tapered shafts and retaining nuts for the pulleys
and the later model with a straight shaft and press-on pulley. Swapping
between straight shaft V-belt pulleys and serpentine pulleys is a simple
matter of using the correct tool. Reservoirs are different because of
different mountings, but they all fit those 2 basic pumps.

There may be something to be said for going to one of the still later,
smaller PS pumps with remote reservoirs. I considered it, but the
serpentine belt, the Cad's pump mounting and location were ideal.

Alternator pulleys are similarly common: You can swap back and forth
between the two types on 'most any GM alternator.

I don't know details of A/C pulley exchanges, but I suspect they're
similarly easy. I bought a new Sanden with many-groove (10, IIRC) pulley
mounted -- that made my serpentine adaptation easy because I could align
with any 6 of those grooves.

From the collection of tensioners I have from the PO, who made some
modifications to Bobby Moore's design, Ford's seem to be most flexible for
design. With the short belts I used, no tensioners were needed (nor
practical).


Ken H.
Americus, GA
'76 X-Birchaven
www.gmcwipersetc.com


On Fri, Mar 26, 2010 at 3:42 PM, Les Burt <burtco99@yahoo.com> wrote:

> I'm looking for feedback from those of you who have done a serpentine belt
> conversion on their 455. Pros & cons. I've heard that some have taken the
> serpentine setup off due to problems. What where the problems?
>
> I want to upgrade to a CS130D alternator, Sanden type A/C compressor, and a
> newer PS pump with a hydroboost return port. These accessories can easily
> be
> found used in the men's malls and most come with serpentine pulleys
> nowadays. Doing a serpentine conversion might reduce the overall difficulty
> in finding suitable accessories. Custom brackets will no doubt be required,
> but I'm good at that.
>
> I am also curious if anyone has done a serpentine conversion that spins the
> water pump & fan in the original direction? I'd prefer this simply so that
> replacement waterpumps are easier to find. I don't want to have to look for
> another fan or special water pump.
>
> What Crank & water pump pulleys are being used? What tensioner? Knowing
> this
> info would save me a bit of time in looking for suitable donor parts.
>
> Thanks,
> Les Burt
> Montreal
> '75 EL2
>
>
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