| [GMCnet] 455 Serpentine belt system [message #78265] |
Sun, 28 March 2010 10:59  |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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NEW THREAD !!
This discussion was originally started under the "Cad 500 Serpentine Belt"
thread.
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg
<http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&th=11032> &th=11032
To keep both discussions on topic, I've started over.
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
1975 Eleganza II 26ft
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] 455 Serpentine belt system [message #78275 is a reply to message #78267] |
Sun, 28 March 2010 11:55  |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
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Bruce,
I've seen various versions of 455 water pumps and noticed the same thing. I
believe it is the water passages in the housing that are the biggest problem
when reversing the rotation.
The March system is way to pretty to put on my GMC! It is a nicely built
system though.
Thanks,
Les Burt
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] 455 Serpentine belt system [message #78279 is a reply to message #78267] |
Sun, 28 March 2010 12:12 |
mannystrans
Messages: 209
Registered: June 2006
Karma: 1
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I put a serpentine on my 455 in 2000. Got it as a kit from a GMC vendor.
I thought it was a great upgrade.
On my first t trip, I noticed the water temp was reading higher than norm 210.
Changed the fan clutch several times. At the time there were issues
with Haden having the fan clutches in Mexico and quality control
wasn't the same. The temp situation didn't improve. I ordered a water
pump from another GMC vendor that claimed it was a reverse rotation
pump. Only it was no different than the one I had with the cast
impeller. When I contacted the vendor to return it and get my money
back, he would only give credit.
I looked around, found an aluminum water pump. Took it to a shop to
remove the guts. I than machined the inside and welded new tabs so it
would be a true reverse flow. Went back to the shop and they put the
guts back.
Now the temp was just like before and the fan clutch came on when I
started the engine and uphill situations.
So now my confidence was high. We took the coach to the International
convention in Oregon. On the way there, I replaced 4 belts.
The a/c compressor is out more than original, very close to the
vertical bars (unique to the 73/74 coaches) and when it hit on hard
pulls, the belt would shred. I had to remove the clutch on the
compressor so I would have clearance. So no a/c but I was worried
about turning it on anyway. When we left the convention, I made it
less than a mile when I heard the freighing again. Returned to the
parking lot and asked for help. Emery came to the rescue. We checked
for binding but all the pulley were free. Checked for alignment and
the power steering pump wasn't quite aligned. A couple of washers
corrected the problem. On the way home, replaced 2 belts. But just
before we got home, the water pump started making noises. I finally
gave up and went back to original.
I really like the idea of a serpentine setup, and I have on on my
current setup (diesel) but the distance between the a/c compressor and
the alternator is too far. In my opinion, one or the other or both
need to re relocated.
--
Manny Trovao
mannystrans@hughes.net
Manny's Trans / Power Drive
San Jose, California
408-937-1583
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| Re: [GMCnet] 455 Serpentine belt system [message #78293 is a reply to message #78265] |
Sun, 28 March 2010 13:32 |
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I want to cobble together a serpentine belt that only turns the alt, PS and AC. the WP I want to replace with a Meziere HD electric pump and electric fan setup, the Meziere unit out flows the stock pump, doesnt sap power from the engine, and the upgraded alt allowed by a serpentine system would be more then enough to power an electric fan and water pump...
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: [GMCnet] 455 Serpentine belt system [message #78333 is a reply to message #78305] |
Sun, 28 March 2010 18:37 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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It would be nice to run the fan and pump on shut-down to cool it off.
Like hitching a horse to a walker.
Ljdavick at comcast.net
On Mar 28, 2010, at 1:24 PM, jack spenser <jspenser@gmail.com> wrote:
> doesnt sap power from the engine,
>
> Turns out all the energy comes from the engine, so it is ok to say you
> want to drive these from electric power, but is not more efficient and
> does sap energy from the engine.
>
> engine supply's rotational energy through a belt, to the alternator
> (loss)
> alternator converts rotational energy to electrical (loss)
> alternator charges the battery (loss - to heat)
> electrical drives a motor (loss)
> which drives a pump (loss)
>
> so driving electrical pumps and fans might be more fun, or more
> convenient, but it is not more economical, or less load on the engine
> .
>
>
>
>
> and the upgraded alt allowed by a serpentine system would be more
> then enough to power an electric fan and water pump...
>>
>>
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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