Flow cooler water pump [message #293544] |
Fri, 08 January 2016 11:25 |
roy1
Messages: 2126 Registered: July 2004 Location: Minden nevada
Karma: 6
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Has anyone had a problem with a flow cooler engine water pump? I put one on my motor and the motor runs at 210-220 degrees on the highway . The thermostat is a Robert shaw type 180 that is opening at 180 in a pot of water. The temperature at the stat housing is the same temp tested with a laser temp tool. I am about to remove this super duper pump and put the old one back on. I wasn't able to find an original 4 1/4 rebuilt out here near quartzite and it takes 2 weeks to order one and it would likely be wrong. My luck is bad lately, we are broke down 20 miles from Quartzite both heads have seized exhaust valves in the 4 middle cylinders. I pulled both heads Monday and sent them to Phoenix for repairs. The motor only has 800 miles on it. The heads are 100% redone apparently the shop made the bronze exhaust guides too tight. It has not been a fun trip replacing plugs ,distributor,etc on the side of the road trying to figure why it was popping thru the carb on grades. Had to unhook the tow vehicle on the last grade as it got worse. Pulled into the campground running on 4 cylinders. When I did a compression check it showed the dead cylinders. I'm very lucky the valves didn't hit the Pistons but Paula doesn't care much for me working on it when we could be shopping in Quartzite.
Roy Keen
Minden,NV
76 X Glenbrook
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Re: Flow cooler water pump [message #293547 is a reply to message #293544] |
Fri, 08 January 2016 13:42 |
Chris Tyler
Messages: 458 Registered: September 2013 Location: Odessa FL
Karma: 7
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I have run the flowkooler pumps on several other engines without any problems, but dont have one on the GMC.
The added flow wont help if the radiator is blocked, you have an accumilation of scale or some other problem
What % coolant are you running?
76 Glenbrook
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Re: Flow cooler water pump [message #293554 is a reply to message #293544] |
Fri, 08 January 2016 15:32 |
Bob de Kruyff
Messages: 4260 Registered: January 2004 Location: Chandler, AZ
Karma: 1
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roy1 wrote on Fri, 08 January 2016 10:25Has anyone had a problem with a flow cooler engine water pump? I put one on my motor and the motor runs at 210-220 degrees on the highway . The thermostat is a Robert shaw type 180 that is opening at 180 in a pot of water. The temperature at the stat housing is the same temp tested with a laser temp tool. I am about to remove this super duper pump and put the old one back on. I wasn't able to find an original 4 1/4 rebuilt out here near quartzite and it takes 2 weeks to order one and it would likely be wrong. My luck is bad lately, we are broke down 20 miles from Quartzite both heads have seized exhaust valves in the 4 middle cylinders. I pulled both heads Monday and sent them to Phoenix for repairs. The motor only has 800 miles on it. The heads are 100% redone apparently the shop made the bronze exhaust guides too tight. It has not been a fun trip replacing plugs ,distributor,etc on the side of the road trying to figure why it was popping thru the carb on grades. Had to unhook the tow vehicle on the last grade as it got worse. Pulled into the campground running on 4 cylinders. When I did a compression check it showed the dead cylinders. I'm very lucky the valves didn't hit the Pistons but Paula doesn't care much for me working on it when we could be shopping in Quartzite.
Other than the quality of the bearings and seals, I doubt that any water pump for our GMC's will affect performance. Impeller size and construction seem to have no effect either. I suspect your problem may be somewhere else.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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Re: Flow cooler water pump [message #293559 is a reply to message #293544] |
Fri, 08 January 2016 18:20 |
JohnL455
Messages: 4447 Registered: October 2006 Location: Woodstock, IL
Karma: 12
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Unless they gave you a serpentine belt pump for reverse rotation. That won't move much fluid. Worth confirming while apart. Could have led to heads overheating.
John Lebetski
Woodstock, IL
77 Eleganza II
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Re: Flow cooler water pump [message #293569 is a reply to message #293559] |
Fri, 08 January 2016 22:01 |
Bob de Kruyff
Messages: 4260 Registered: January 2004 Location: Chandler, AZ
Karma: 1
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JohnL455 wrote on Fri, 08 January 2016 17:20Unless they gave you a serpentine belt pump for reverse rotation. That won't move much fluid. Worth confirming while apart. Could have led to heads overheating.
Good catch!
Bob de Kruyff
78 Eleganza
Chandler, AZ
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Re: Flow cooler water pump [message #293606 is a reply to message #293544] |
Sat, 09 January 2016 11:23 |
roy1
Messages: 2126 Registered: July 2004 Location: Minden nevada
Karma: 6
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Pulled the flow cooler it looks ok but I'll put the old on back on anyway. The aluminum radiator is clean heck with 30 deg air it is actually cold. The head shop in Phoenix says the exhaust guides were way too tight. My guy in Reno is accusing me of leaning out the carb to gain gas mileage. Sure I'm getting 5-7 mpg and the plugs are a medium tan color I suppose he doesn't want to accept any responsibility for his screw up. The world is full of experts that can do no wrong.
Roy Keen
Minden,NV
76 X Glenbrook
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Re: Flow cooler water pump [message #293629 is a reply to message #293544] |
Sat, 09 January 2016 15:42 |
JohnL455
Messages: 4447 Registered: October 2006 Location: Woodstock, IL
Karma: 12
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Leaning by rejetting?? Or by the idle screws, which won't do much on the highway. He said she said.
John Lebetski
Woodstock, IL
77 Eleganza II
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Re: [GMCnet] Flow cooler water pump [message #293634 is a reply to message #293629] |
Sat, 09 January 2016 16:31 |
James Hupy
Messages: 6806 Registered: May 2010
Karma: -62
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Idle air screws only regulate the air/fuel mixture that goes through the
idle circuit, and only then when the butterflies are closed, or nearly so.
They have ALMOST NO impact on air/fuel ratios at any other time,
particularly at cruising speed. Just the way they are designed. As for main
jetting, long story here. Too much for this venue. But, with the engine
discussed here that seized the center exhaust valves with only 800 or so
miles, I am thinking that carb mixtures had little to do with this problem.
More than likely, not enough stem to guide clearance, and not enough
lubrication either. Dead on the side of the road is no place to find
yourself. Sounds like you have the solution at hand, though. Sure screws up
a fun trip. I feel sorry for you.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Jan 9, 2016 1:43 PM, "John R. Lebetski" wrote:
> Leaning by rejetting?? Or by the idle screws, which won't do much on the
> highway. He said she said.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
> Source America First
>
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Re: [GMCnet] Flow cooler water pump [message #293648 is a reply to message #293634] |
Sat, 09 January 2016 20:37 |
roy1
Messages: 2126 Registered: July 2004 Location: Minden nevada
Karma: 6
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Thanks for the thoughts Jim .i agree the guides were just too tight and the jetting of the carb should not be the cause especially when you consider they are the original jets in the original Motorhome carb . Considering the crank thrust failure last spring and now this also bad experience Paula is thinking the Motorhome is no longer reliable the poor workmanship of my machine shop has hurt me more then they will ever know. Hope to have it together by the end of next week.
Roy Keen
Minden,NV
76 X Glenbrook
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Re: Flow cooler water pump [message #293704 is a reply to message #293544] |
Mon, 11 January 2016 07:58 |
Chris Tyler
Messages: 458 Registered: September 2013 Location: Odessa FL
Karma: 7
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Bronze guides usually give you some leeway on that; as they will clearence themselves rather than gall like steel on iron will. Thosw must have beeb so tight they were binding with no oil flow.
Does flow cooler even make a reverse rotation pump for the olds? Suppose it could have had the wrong impellor put in it...but then you would have melted down pretty fast.
50/50 coolant shouldnt be an issue
Have to wonder what role timing had in this, with the description of backfiring , low milage and overheating. If the marks are off form the balancer slipping or some other error, the timing may not have been what it looked like.
76 Glenbrook
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Re: Flow cooler water pump [message #294418 is a reply to message #293544] |
Mon, 25 January 2016 20:55 |
roy1
Messages: 2126 Registered: July 2004 Location: Minden nevada
Karma: 6
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Senior Member |
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roy1 wrote on Fri, 08 January 2016 09:25Has anyone had a problem with a flow cooler engine water pump? I put one on my motor and the motor runs at 210-220 degrees on the highway . The thermostat is a Robert shaw type 180 that is opening at 180 in a pot of water. The temperature at the stat housing is the same temp tested with a laser temp tool. I am about to remove this super duper pump and put the old one back on. I wasn't able to find an original 4 1/4 rebuilt out here near quartzite and it takes 2 weeks to order one and it would likely be wrong. My luck is bad lately, we are broke down 20 miles from Quartzite both heads have seized exhaust valves in the 4 middle cylinders. I pulled both heads Monday and sent them to Phoenix for repairs. The motor only has 800 miles on it. The heads are 100% redone apparently the shop made the bronze exhaust guides too tight. It has not been a fun trip replacing plugs ,distributor,etc on the side of the road trying to figure why it was popping thru the carb on grades. Had to unhook the tow vehicle on the last grade as it got worse. Pulled into the campground running on 4 cylinders. When I did a compression check it showed the dead cylinders. I'm very lucky the valves didn't hit the Pistons but Paula doesn't care much for me working on it when we could be shopping in Quartzite.
Update on not so trouble free vacation. Got the heads back from Phoenix the machine shop removed the bronze guides and installed iron guides said solid bronze was trouble I put the engine back together in the campground.I removed the flow cooler water pump and put my old pump back on,engine now runs 180_190 like it should called summit and they will take it back and pay the shipping.I'll bet my machinist in Reno won't be feeling he made a mistake. I'm damn lucky the 4 stuck exaust valves didn't hit the pistons and really mess up the engine. Took it for a 20 mile ride seems ok for my several hundred mile drive home in 2 weeks with the Toyota in tow.
Roy Keen
Minden,NV
76 X Glenbrook
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