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| Re: [GMCnet] Water Pump [message #340797 is a reply to message #340793] |
Sat, 09 February 2019 11:19   |
JerryW
Messages: 256
Registered: August 2018
Karma: 1
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Senior Member |
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Down in my shop right now, I have 5 GMC water pumps. All of them carried
the same part number on the cardboard box that they were purchased in by me
at 4 different locations. 2 of them came from Applied Air filters and GMC.
One of those two was labeled high performance. It has an aluminum casting,
and a purple anodized impeller with a back plate on the impeller. All the
other 4 are cast iron. Some with cast impellers, some with stamped sheet
metal impellers. There appears to be two distinct gasket shapes, with
different gaskets, hose block offs, and clamp options.
BUYER BEWARE. TAKE YOUR OLD PUMP OFF, AND TAKE IT WITH YOU TO YOUR
LOCAL SUPPLIER.
Oh, you ordered it online? Rotsa Ruck getting an exact replacement.
Jim Hupy
Salem, Or
On Sat, Feb 9, 2019, 8:53 AM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org wrote:
> Corporate blue started in 77. ( Note. Sometimes pumps come with a clear
> coating for rust prevention. Liquor thinner removes it. ) Has your
> plastic/aluminum cam sprocket been changed to a cast iron sprocket? If not.
> Now is the time. When that original sprocket starts to fail. It WILL take
> out your main/rod bearings. Plastics are prone to crack with age. There is
> no warning signs for the sprocket failure. Remove your stock fuel pump. Use
> an inspection camera to see what sprocket is in there. You can call me on
> this anytime if you like. 319-521-4891 CST. As to a replacement chain set.
> The original OEM chain sets are fine for our application. There are roller
> types for more money. Don't bother. Not worth getting. Those roller chain
> sets are great if your over 5,000 RPMs, have a radical race cam. That has a
> high lift/long deration profile installed, and thus require high pressure
> valve springs to prevent valve float. Bob Dunahugh 78 Royale
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] Water Pump [message #340891 is a reply to message #112787] |
Mon, 11 February 2019 09:18 |
JerryW
Messages: 256
Registered: August 2018
Karma: 1
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Senior Member |
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Thanks, Bob, My primary project is replacing the timing chain, but I
will also be changing the water pump as a Slongaz project.
What's a Slongaz project you might ask?
Well, it's a project you undertake as a result of another related
project. In this case, 'as-long-as' (slongaz) I'm replacing the timing
chain, I should replace the water pump, and slongaz I'm replacing the
water pump, I should replace the fan clutch, belts and hoses, and
slongaz I'm pulling those hoses I should change the coolant, etc.
Most of my projects end up being slongaz projects.
-Dave
1978 Transmode near Pittsburgh
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Bob
Dunahugh via Gmclist
Sent: Saturday, February 09, 2019 11:53 AM
To: gmclist@list.gmcnet.org
Cc: Bob Dunahugh
Subject: Re: [GMCnet] Water Pump
Corporate blue started in 77. ( Note. Sometimes pumps come with a clear
coating for rust prevention. Liquor thinner removes it. ) Has your
plastic/aluminum cam sprocket been changed to a cast iron sprocket? If
not. Now is the time. When that original sprocket starts to fail. It
WILL take out your main/rod bearings. Plastics are prone to crack with
age. There is no warning signs for the sprocket failure. Remove your
stock fuel pump. Use an inspection camera to see what sprocket is in
there. You can call me on this anytime if you like. 319-521-4891 CST.
As to a replacement chain set. The original OEM chain sets are fine for
our application. There are roller types for more money. Don't bother.
Not worth getting. Those roller chain sets are great if your over 5,000
RPMs, have a radical race cam. That has a high lift/long deration
profile installed, and thus require high pressure valve springs to
prevent valve float. Bob Dunahugh 78 Royale
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GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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