Author Topic: Need some advice guys, 4104 Water Pump  (Read 2281 times)

Offline T Chellis

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Need some advice guys, 4104 Water Pump
« on: June 17, 2006, 10:21:35 AM »
I need some advice....I have a pd 4104 1958 with a Detroit 671.. The drain plug on the engine water pump has been  leaking so I pulled it out looked it over put some pipe dope on it and put it back in and still leaks. So I looked a little closer  with a bright light and I can see a small crack in the bottom of the pump where the plug screws into. I figure a new water pump. How difficult is it to replace? Do I have to mess with the blower? Thanks for your advise in advance....T Chellis

I'll modify the above. I couldn't waste anymore time so I jumped into the thing. I removed the water pump and it was very easy.  I will now locate a new pump....Thanks 
« Last Edit: June 17, 2006, 03:33:47 PM by DrivingMissLazy »

Offline RTS/Daytona

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Re: Need some advice guys, 4104 Water Pump
« Reply #1 on: June 17, 2006, 04:53:20 PM »
Just a thought --

Why not use a small drill and drill a "crack stop check" hole close to the end of the crack line

Grind the crack surface and a little v groove and use 2 part regular JB WELD

JB weld works great on lots of surfaces - cast iron included - I've repaired a crack in a GMC classic motorhome
casting - never failed

What have you got to lose

"THIS IS A NO FLAK BACK" suggestion - please

Pete RTS/Daytona
If you ain't part of the solution, then you're part of the problem.


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Re: Need some advice guys, 4104 Water Pump
« Reply #2 on: June 17, 2006, 05:08:59 PM »
I might not be correct in remembering how the circulating pump mounts in a 6-71 but.... While I can remember it takes a special wrench to get at one or two of the mounting bolts...I believe I recall that it's driven by a 3 pronged 'thingy' which mates to another 3 pronged 'thingy'.  so once you drain the system and have the special wrench to remove the virtually inaccessible should be a 'no sweat' deal.  ???

I'm not twisting your tail guy...but probably the best thing to do is to either have a good Detroit Wrench replace the pump or get ready for some real grief! :-\

With the transverse engine mounting I can't help but think..."I don't wanna do this"! :P

Offline T Chellis

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Re: Need some advice guys, 4104 Water Pump
« Reply #3 on: June 18, 2006, 05:25:37 PM »
Update on Water pump.  Ihad no problem getting pump off. The bolt that is hard to get to is a nut and not a bolt. It is slow but I did it with an open end wrench.  The crack in the pump is about 1" long. I'm told it cannot be traded in with the crack.  It will (knowing my mechanical ability) take twice as long to put it back on as to taking it off.  I think before I do the JB Weld thing I will see what DEtroit gets for a replacement pump.  I like your Idea of JB weld though.  It's the weekend so I will see what I can find out this Mon.  Again I really appreciate this board to talk to people that have been there before.     T. Chellis

Offline RJ

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Re: Need some advice guys, 4104 Water Pump
« Reply #4 on: June 18, 2006, 08:41:57 PM »
Don't forget to check with Luke @ US Coach, too.  1-888-262-2434 between 9-5 Eastern, M-F.
RJ Long
PD4106-2784: Donated to the Pacific Bus Museum
S14947: 1980 MC-5C Shell 6V92/HT-740
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M1001907: 1992 Prevost XL Vantarè Conversion 8V92T/HT-755 (DDEC/ATEC)
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