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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 Go to previous message
GMC.LES is currently offline  GMC.LES   United States
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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
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>>
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