Home » Public Forums » GMCnet » [GMCnet] Do our engine water pumps die from age, or miles ?
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| Re: [GMCnet] Do our engine water pumps die from age, or miles ? [message #329430 is a reply to message #329428] |
Fri, 23 February 2018 04:42   |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I can not remember the last time I replaced a water pump on anything except my GMC. I always throw one can of water pump lube (around $3.00) in to any antifreeze change. I have around 250,000 miles and 20 years on my GMC. Over 150,000 miles and 19 years on Laurie's Jimmy, and a little less than 150,000 on my 13 year old Colorado.
I replaced my GMC pump about 12 years ago because I could. I used a 4" impeller pump from NAPA.
What kills a pump? In my opinion it is lack of lubrication of the seal, or rust / wear in the bearing. A little lube helps those two even when parked.
Replace the pump while you are there and throw two cans of lube in with 6 gallons of 50/50 mixed fresh antifreeze. I always use $.88 per gallon Walmart distilled water for the mix.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Do our engine water pumps die from age, or miles ? [message #329433 is a reply to message #329430] |
Fri, 23 February 2018 08:09 |
Dave Stragand
Messages: 307
Registered: October 2017
Karma: 0
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Senior Member |
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This could be what we refer to as a "slongaz" project. Slongaz the
radiator is out, you may as well check the water pump. Slongaz ('as
long as') the water pump is out you may as well check/change the timing
chain, etc...
Would I be correct in assuming that removing the fuel pump while you're
in there would allow you to see/feel the condition of the current chain?
If so, that might be another "slongaz" to add.
-Dave
1978 Transmode (403)
Near Pittsburgh
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1978 Transmode (403)
Pittsburgh, PA
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| Re: [GMCnet] Do our engine water pumps die from age, or miles ? [message #329434 is a reply to message #329427] |
Fri, 23 February 2018 08:34 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Be ssure you get a pump which has roller bearings in front as opposed to ball bearings, because of the greater side load in the motorhome from the alternator among other things. The roller front bearing also holds up best if you use the OEM (heavy) fan.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Do our engine water pumps die from age, or miles ? [message #329443 is a reply to message #329427] |
Fri, 23 February 2018 14:09 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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BobDunahugh wrote on Fri, 23 February 2018 01:03My radiator is out. So it's simple to change the water pump. PO rebuilt the 403 in 1994. Put 1880 miles on it in 1995. Then this 78 Royale was parked outside from Oct of 1995 to Oct of 2015. Now we've put 12,000 miles on it. The radiator is a mess inside. I'm changing that. So what condition is the water pump in? Bob Dunahugh 78 Royale
Bob,
To answer your question as best it can be answered.
Jacket water pumps in passcar (as close to the coach as I know) die of either:
A - Seal failure
B - Bearing failure
Seal failures used to be common before the Stellite/Ceramic mechanical seals. These are lubricated by the coolant, and come very close to not wearing at all, but they do this with a very little, but almost continues leak when running. If you look "under the chin" of any new water pump, you will see a small feature that has a plug in it with a tiny hole. That is a "Warranty Avoider". The drips from the seal go in there instead of into the bearing (pumps have always had the feature to leak coolant and not have it end up in the bearing), and there is often some packing in the space to help the trapped coolant evaporate before an owner sees it and complains.
Bearing failures used to be common before synthetic grease. Normal grease has a limited life and this is way we used to repack wheel bearings all the time. When the grease did age out, the bearing was soon toast. That was not uncommon at 15~20 years, but it could easily happen sooner. How long is a synthetic grease good? I don't know. I have things here that I repacked with a synthetic two houses ago.
So, is it a good thing to change out on general principle?
As said above, it is kind of a slongaz thing.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Do our engine water pumps die from age, or miles ? [message #329454 is a reply to message #329443] |
Fri, 23 February 2018 23:23 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Fuel pump must replaced if not in last 5 years.
Reason is the Ethanol is eating the rubber diaphram that is already old.
I have seen the ruptured fuel pump take out engines.
I requested to my techs to replace all the rubber in the fuel system, they
left the old pump and it went and filled the crankcase with fuel and ruind
a good engine.
On Fri, Feb 23, 2018 at 12:09 PM, Matt Colie wrote:
> BobDunahugh wrote on Fri, 23 February 2018 01:03
>> My radiator is out. So it's simple to change the water pump. PO rebuilt
> the 403 in 1994. Put 1880 miles on it in 1995. Then this 78 Royale was
>> parked outside from Oct of 1995 to Oct of 2015. Now we've put 12,000
> miles on it. The radiator is a mess inside. I'm changing that. So what
>> condition is the water pump in? Bob Dunahugh 78 Royale
>
> Bob,
>
> To answer your question as best it can be answered.
> Jacket water pumps in passcar (as close to the coach as I know) die of
> either:
> A - Seal failure
> B - Bearing failure
>
> Seal failures used to be common before the Stellite/Ceramic mechanical
> seals. These are lubricated by the coolant, and come very close to not
> wearing
> at all, but they do this with a very little, but almost continues leak
> when running. If you look "under the chin" of any new water pump, you will
> see
> a small feature that has a plug in it with a tiny hole. That is a
> "Warranty Avoider". The drips from the seal go in there instead of into the
> bearing (pumps have always had the feature to leak coolant and not have it
> end up in the bearing), and there is often some packing in the space to
> help the trapped coolant evaporate before an owner sees it and complains.
>
> Bearing failures used to be common before synthetic grease. Normal grease
> has a limited life and this is way we used to repack wheel bearings all the
> time. When the grease did age out, the bearing was soon toast. That was
> not uncommon at 15~20 years, but it could easily happen sooner. How long is
> a synthetic grease good? I don't know. I have things here that I
> repacked with a synthetic two houses ago.
>
> So, is it a good thing to change out on general principle?
> As said above, it is kind of a slongaz thing.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Do our engine water pumps die from age, or miles ? [message #329459 is a reply to message #329454] |
Sat, 24 February 2018 09:37 |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Senior Member |
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Water pump life span also has a lot to do with vehicle use. A vehicle that sits long periods will often have more leaks and parts longevity issues than one that is run regularly. This is the main reason why people with high mileage vehicles will have a better reliability than those who barely use their vehicles. KenB’s vehicles are a good example.
My own experiences with dormant vehicles has been that most seals will develop a leak shortly after the vehicle has been put to use. My JD tractor sleeps most of the summer, come the fall, It weeps oil from the front axle until I’ve put a few hours of use on it. My 57 Unimog 401 leaks from the water pump each time I run it, which is about once a year for fun. With water pump lube it reduces to a drip once engine is warmed up. I’ve replaced the pump twice in 20 years with same results after a year or two.
Given the time, I find it is cheaper to take our toys for a ride on a monthly basis than it is to let them sit unused for several months.
No all I need is to find the time. :)
Les Burt
Montreal
'75 Eleganza 26'
> On Feb 24, 2018, at 12:23 AM, Jim Kanomata wrote:
>
> Fuel pump must replaced if not in last 5 years.
> Reason is the Ethanol is eating the rubber diaphram that is already old.
> I have seen the ruptured fuel pump take out engines.
> I requested to my techs to replace all the rubber in the fuel system, they
> left the old pump and it went and filled the crankcase with fuel and ruind
> a good engine.
>
> On Fri, Feb 23, 2018 at 12:09 PM, Matt Colie wrote:
>
>> BobDunahugh wrote on Fri, 23 February 2018 01:03
>>> My radiator is out. So it's simple to change the water pump. PO rebuilt
>> the 403 in 1994. Put 1880 miles on it in 1995. Then this 78 Royale was
>>> parked outside from Oct of 1995 to Oct of 2015. Now we've put 12,000
>> miles on it. The radiator is a mess inside. I'm changing that. So what
>>> condition is the water pump in? Bob Dunahugh 78 Royale
>>
>> Bob,
>>
>> To answer your question as best it can be answered.
>> Jacket water pumps in passcar (as close to the coach as I know) die of
>> either:
>> A - Seal failure
>> B - Bearing failure
>>
>> Seal failures used to be common before the Stellite/Ceramic mechanical
>> seals. These are lubricated by the coolant, and come very close to not
>> wearing
>> at all, but they do this with a very little, but almost continues leak
>> when running. If you look "under the chin" of any new water pump, you will
>> see
>> a small feature that has a plug in it with a tiny hole. That is a
>> "Warranty Avoider". The drips from the seal go in there instead of into the
>> bearing (pumps have always had the feature to leak coolant and not have it
>> end up in the bearing), and there is often some packing in the space to
>> help the trapped coolant evaporate before an owner sees it and complains.
>>
>> Bearing failures used to be common before synthetic grease. Normal grease
>> has a limited life and this is way we used to repack wheel bearings all the
>> time. When the grease did age out, the bearing was soon toast. That was
>> not uncommon at 15~20 years, but it could easily happen sooner. How long is
>> a synthetic grease good? I don't know. I have things here that I
>> repacked with a synthetic two houses ago.
>>
>> So, is it a good thing to change out on general principle?
>> As said above, it is kind of a slongaz thing.
>>
>> Matt
>> --
>> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
>> Electronically Controlled Quiet Engine Cooling Fan
>> OE Rear Drum Brakes with Applied Control Arms
>> SE Michigan - Twixt A2 and Detroit
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Do our engine water pumps die from age, or miles ? [message #329460 is a reply to message #329459] |
Sat, 24 February 2018 09:43 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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It's the same deal with us humans. "Use it, or lose it" applies here, too.
Stay active, folks, the alternative ain't great.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Feb 24, 2018 7:38 AM, "Les Burt" wrote:
> Water pump life span also has a lot to do with vehicle use. A vehicle that
> sits long periods will often have more leaks and parts longevity issues
> than one that is run regularly. This is the main reason why people with
> high mileage vehicles will have a better reliability than those who barely
> use their vehicles. KenB’s vehicles are a good example.
>
> My own experiences with dormant vehicles has been that most seals will
> develop a leak shortly after the vehicle has been put to use. My JD tractor
> sleeps most of the summer, come the fall, It weeps oil from the front axle
> until I’ve put a few hours of use on it. My 57 Unimog 401 leaks from the
> water pump each time I run it, which is about once a year for fun. With
> water pump lube it reduces to a drip once engine is warmed up. I’ve
> replaced the pump twice in 20 years with same results after a year or two.
>
> Given the time, I find it is cheaper to take our toys for a ride on a
> monthly basis than it is to let them sit unused for several months.
>
> No all I need is to find the time. :)
>
> Les Burt
> Montreal
> '75 Eleganza 26'
>
>
>> On Feb 24, 2018, at 12:23 AM, Jim Kanomata
> wrote:
>>
>> Fuel pump must replaced if not in last 5 years.
>> Reason is the Ethanol is eating the rubber diaphram that is already old.
>> I have seen the ruptured fuel pump take out engines.
>> I requested to my techs to replace all the rubber in the fuel system,
> they
>> left the old pump and it went and filled the crankcase with fuel and
> ruind
>> a good engine.
>>
>> On Fri, Feb 23, 2018 at 12:09 PM, Matt Colie
> wrote:
>>
>>> BobDunahugh wrote on Fri, 23 February 2018 01:03
>>>> My radiator is out. So it's simple to change the water pump. PO
> rebuilt
>>> the 403 in 1994. Put 1880 miles on it in 1995. Then this 78 Royale was
>>>> parked outside from Oct of 1995 to Oct of 2015. Now we've put 12,000
>>> miles on it. The radiator is a mess inside. I'm changing that. So what
>>>> condition is the water pump in? Bob Dunahugh 78 Royale
>>>
>>> Bob,
>>>
>>> To answer your question as best it can be answered.
>>> Jacket water pumps in passcar (as close to the coach as I know) die of
>>> either:
>>> A - Seal failure
>>> B - Bearing failure
>>>
>>> Seal failures used to be common before the Stellite/Ceramic mechanical
>>> seals. These are lubricated by the coolant, and come very close to not
>>> wearing
>>> at all, but they do this with a very little, but almost continues leak
>>> when running. If you look "under the chin" of any new water pump, you
> will
>>> see
>>> a small feature that has a plug in it with a tiny hole. That is a
>>> "Warranty Avoider". The drips from the seal go in there instead of
> into the
>>> bearing (pumps have always had the feature to leak coolant and not have
> it
>>> end up in the bearing), and there is often some packing in the space to
>>> help the trapped coolant evaporate before an owner sees it and
> complains.
>>>
>>> Bearing failures used to be common before synthetic grease. Normal
> grease
>>> has a limited life and this is way we used to repack wheel bearings all
> the
>>> time. When the grease did age out, the bearing was soon toast. That
> was
>>> not uncommon at 15~20 years, but it could easily happen sooner. How
> long is
>>> a synthetic grease good? I don't know. I have things here that I
>>> repacked with a synthetic two houses ago.
>>>
>>> So, is it a good thing to change out on general principle?
>>> As said above, it is kind of a slongaz thing.
>>>
>>> Matt
>>> --
>>> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
>>> Electronically Controlled Quiet Engine Cooling Fan
>>> OE Rear Drum Brakes with Applied Control Arms
>>> SE Michigan - Twixt A2 and Detroit
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>>
>>
>>
>> --
>> Jim Kanomata
>> Applied/GMC, Newark,CA
>> jimk@appliedairfilters.com
>> http://www.appliedgmc.com
>> 1-800-752-7502
>> _______________________________________________
>> 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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| Re: [GMCnet] Do our engine water pumps die from age, or miles ? [message #329461 is a reply to message #329460] |
Sat, 24 February 2018 09:50 |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
|
Senior Member |
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That should have been JimH.
Les Burt
Montreal
'75 Eleganza 26'
> On Feb 24, 2018, at 10:43 AM, James Hupy wrote:
>
> It's the same deal with us humans. "Use it, or lose it" applies here, too.
> Stay active, folks, the alternative ain't great.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
>> On Feb 24, 2018 7:38 AM, "Les Burt" wrote:
>>
>> Water pump life span also has a lot to do with vehicle use. A vehicle that
>> sits long periods will often have more leaks and parts longevity issues
>> than one that is run regularly. This is the main reason why people with
>> high mileage vehicles will have a better reliability than those who barely
>> use their vehicles. KenB’s vehicles are a good example.
>>
>> My own experiences with dormant vehicles has been that most seals will
>> develop a leak shortly after the vehicle has been put to use. My JD tractor
>> sleeps most of the summer, come the fall, It weeps oil from the front axle
>> until I’ve put a few hours of use on it. My 57 Unimog 401 leaks from the
>> water pump each time I run it, which is about once a year for fun. With
>> water pump lube it reduces to a drip once engine is warmed up. I’ve
>> replaced the pump twice in 20 years with same results after a year or two.
>>
>> Given the time, I find it is cheaper to take our toys for a ride on a
>> monthly basis than it is to let them sit unused for several months.
>>
>> No all I need is to find the time. :)
>>
>> Les Burt
>> Montreal
>> '75 Eleganza 26'
>>
>>
>>> On Feb 24, 2018, at 12:23 AM, Jim Kanomata
>> wrote:
>>>
>>> Fuel pump must replaced if not in last 5 years.
>>> Reason is the Ethanol is eating the rubber diaphram that is already old.
>>> I have seen the ruptured fuel pump take out engines.
>>> I requested to my techs to replace all the rubber in the fuel system,
>> they
>>> left the old pump and it went and filled the crankcase with fuel and
>> ruind
>>> a good engine.
>>>
>>> On Fri, Feb 23, 2018 at 12:09 PM, Matt Colie
>> wrote:
>>>
>>>> BobDunahugh wrote on Fri, 23 February 2018 01:03
>>>> > My radiator is out. So it's simple to change the water pump. PO
>> rebuilt
>>>> the 403 in 1994. Put 1880 miles on it in 1995. Then this 78 Royale was
>>>> > parked outside from Oct of 1995 to Oct of 2015. Now we've put 12,000
>>>> miles on it. The radiator is a mess inside. I'm changing that. So what
>>>> > condition is the water pump in? Bob Dunahugh 78 Royale
>>>>
>>>> Bob,
>>>>
>>>> To answer your question as best it can be answered.
>>>> Jacket water pumps in passcar (as close to the coach as I know) die of
>>>> either:
>>>> A - Seal failure
>>>> B - Bearing failure
>>>>
>>>> Seal failures used to be common before the Stellite/Ceramic mechanical
>>>> seals. These are lubricated by the coolant, and come very close to not
>>>> wearing
>>>> at all, but they do this with a very little, but almost continues leak
>>>> when running. If you look "under the chin" of any new water pump, you
>> will
>>>> see
>>>> a small feature that has a plug in it with a tiny hole. That is a
>>>> "Warranty Avoider". The drips from the seal go in there instead of
>> into the
>>>> bearing (pumps have always had the feature to leak coolant and not have
>> it
>>>> end up in the bearing), and there is often some packing in the space to
>>>> help the trapped coolant evaporate before an owner sees it and
>> complains.
>>>>
>>>> Bearing failures used to be common before synthetic grease. Normal
>> grease
>>>> has a limited life and this is way we used to repack wheel bearings all
>> the
>>>> time. When the grease did age out, the bearing was soon toast. That
>> was
>>>> not uncommon at 15~20 years, but it could easily happen sooner. How
>> long is
>>>> a synthetic grease good? I don't know. I have things here that I
>>>> repacked with a synthetic two houses ago.
>>>>
>>>> So, is it a good thing to change out on general principle?
>>>> As said above, it is kind of a slongaz thing.
>>>>
>>>> Matt
>>>> --
>>>> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
>>>> Electronically Controlled Quiet Engine Cooling Fan
>>>> OE Rear Drum Brakes with Applied Control Arms
>>>> SE Michigan - Twixt A2 and Detroit
>>>>
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>>
>>>
>>>
>>>
>>> --
>>> Jim Kanomata
>>> Applied/GMC, Newark,CA
>>> jimk@appliedairfilters.com
>>> http://www.appliedgmc.com
>>> 1-800-752-7502
>>> _______________________________________________
>>> 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
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
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| Re: [GMCnet] Do our engine water pumps die from age, or miles ? [message #329462 is a reply to message #329460] |
Sat, 24 February 2018 09:49 |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
|
Senior Member |
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|
JimK
Ain’t that the truth, in more ways than one! ;)
Les Burt
Montreal
'75 Eleganza 26'
> On Feb 24, 2018, at 10:43 AM, James Hupy wrote:
>
> It's the same deal with us humans. "Use it, or lose it" applies here, too.
> Stay active, folks, the alternative ain't great.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
>> On Feb 24, 2018 7:38 AM, "Les Burt" wrote:
>>
>> Water pump life span also has a lot to do with vehicle use. A vehicle that
>> sits long periods will often have more leaks and parts longevity issues
>> than one that is run regularly. This is the main reason why people with
>> high mileage vehicles will have a better reliability than those who barely
>> use their vehicles. KenB’s vehicles are a good example.
>>
>> My own experiences with dormant vehicles has been that most seals will
>> develop a leak shortly after the vehicle has been put to use. My JD tractor
>> sleeps most of the summer, come the fall, It weeps oil from the front axle
>> until I’ve put a few hours of use on it. My 57 Unimog 401 leaks from the
>> water pump each time I run it, which is about once a year for fun. With
>> water pump lube it reduces to a drip once engine is warmed up. I’ve
>> replaced the pump twice in 20 years with same results after a year or two.
>>
>> Given the time, I find it is cheaper to take our toys for a ride on a
>> monthly basis than it is to let them sit unused for several months.
>>
>> No all I need is to find the time. :)
>>
>> Les Burt
>> Montreal
>> '75 Eleganza 26'
>>
>>
>>> On Feb 24, 2018, at 12:23 AM, Jim Kanomata
>> wrote:
>>>
>>> Fuel pump must replaced if not in last 5 years.
>>> Reason is the Ethanol is eating the rubber diaphram that is already old.
>>> I have seen the ruptured fuel pump take out engines.
>>> I requested to my techs to replace all the rubber in the fuel system,
>> they
>>> left the old pump and it went and filled the crankcase with fuel and
>> ruind
>>> a good engine.
>>>
>>> On Fri, Feb 23, 2018 at 12:09 PM, Matt Colie
>> wrote:
>>>
>>>> BobDunahugh wrote on Fri, 23 February 2018 01:03
>>>> > My radiator is out. So it's simple to change the water pump. PO
>> rebuilt
>>>> the 403 in 1994. Put 1880 miles on it in 1995. Then this 78 Royale was
>>>> > parked outside from Oct of 1995 to Oct of 2015. Now we've put 12,000
>>>> miles on it. The radiator is a mess inside. I'm changing that. So what
>>>> > condition is the water pump in? Bob Dunahugh 78 Royale
>>>>
>>>> Bob,
>>>>
>>>> To answer your question as best it can be answered.
>>>> Jacket water pumps in passcar (as close to the coach as I know) die of
>>>> either:
>>>> A - Seal failure
>>>> B - Bearing failure
>>>>
>>>> Seal failures used to be common before the Stellite/Ceramic mechanical
>>>> seals. These are lubricated by the coolant, and come very close to not
>>>> wearing
>>>> at all, but they do this with a very little, but almost continues leak
>>>> when running. If you look "under the chin" of any new water pump, you
>> will
>>>> see
>>>> a small feature that has a plug in it with a tiny hole. That is a
>>>> "Warranty Avoider". The drips from the seal go in there instead of
>> into the
>>>> bearing (pumps have always had the feature to leak coolant and not have
>> it
>>>> end up in the bearing), and there is often some packing in the space to
>>>> help the trapped coolant evaporate before an owner sees it and
>> complains.
>>>>
>>>> Bearing failures used to be common before synthetic grease. Normal
>> grease
>>>> has a limited life and this is way we used to repack wheel bearings all
>> the
>>>> time. When the grease did age out, the bearing was soon toast. That
>> was
>>>> not uncommon at 15~20 years, but it could easily happen sooner. How
>> long is
>>>> a synthetic grease good? I don't know. I have things here that I
>>>> repacked with a synthetic two houses ago.
>>>>
>>>> So, is it a good thing to change out on general principle?
>>>> As said above, it is kind of a slongaz thing.
>>>>
>>>> Matt
>>>> --
>>>> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
>>>> Electronically Controlled Quiet Engine Cooling Fan
>>>> OE Rear Drum Brakes with Applied Control Arms
>>>> SE Michigan - Twixt A2 and Detroit
>>>>
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>>>>
>>>
>>>
>>>
>>> --
>>> Jim Kanomata
>>> Applied/GMC, Newark,CA
>>> jimk@appliedairfilters.com
>>> http://www.appliedgmc.com
>>> 1-800-752-7502
>>> _______________________________________________
>>> GMCnet mailing list
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>>
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