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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #21  
Old 08-09-2017
mpierce mpierce is offline
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I could not get the 1712 to fit either. The 1704 did. They are almost the same.

The 1704 has a "boss" on the plate, so it can, in effect, be out further. I think the 1712 would work, using the plate for the 1704!

The boxes said the 1704 is for 8V92 that does NOT mount the AC compressor right beside it. The 1712 says it is for 8V92 that DOES mount the AC compressor right by it.

However, my AC is right there, and the 1704 fits! Oh well.

Anyway, the 1704 fits our 8V92's.

Thanks MRKANE for the heads up! I had both on hand when I took it out, thanks to you.

Neither of the new ones, looked just like the old one! LOL. Maybe the old is a different brand. The electrical connection was different than the ZeroStart.
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Melvin and Charlene Pierce
Scranton, ND
"Smoke N Mirrors" Royale Conversion
1990 PT40WB
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  #22  
Old 12-02-2017
Debugjaws Debugjaws is offline
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I know this thread is old, but mine shorted out. It still has the label on it. It is manufactured by a company called KATS. Part number is 30304. NAPA was able to order up a new one, same number, about $95.00.
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Gerry Lefebvre
Newberg, Oregon
91 WB 40'
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  #23  
Old 12-18-2018
MOConnor MOConnor is offline
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Thanks Gerry
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Martin OConnor
Novi, Michigan
1984 PT 35
1987 PT 40
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  #24  
Old 12-18-2018
MOConnor MOConnor is offline
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Do you know if the pump works when the heating element is activated?

And location of the circulating pump?
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Martin OConnor
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1984 PT 35
1987 PT 40
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  #25  
Old 12-19-2018
Debugjaws Debugjaws is offline
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Quote:
Originally Posted by Eagle1 View Post
Do you know if the pump works when the heating element is activated?

And location of the circulating pump?
It works on my '91 WB. I don't know about your mid 80's PT. Regarding location, On my WB it is located up on the frame rail towards the middle of the coach behind the house batteries. I suppose the operational principal is the same regardless of if the engine is a CAT 3208 or a Detroit 8v92. Regarding power requirements, I suppose if you're plugged into a 50 amp service you'd be fine. I have run both at the same time for an hour or two with no breakers flipping. But I also make sure my wife's not using the microwave, blow drier, etc.
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Gerry Lefebvre
Newberg, Oregon
91 WB 40'
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  #26  
Old 12-19-2018
MOConnor MOConnor is offline
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Default Block heater operation ?

I ordered the 860-1704 from Napa.
The plug into the heater element is corroded . I am getting power to the plug.

Going to clean end and go from there.

My question is: is there a circulating pump that works with the 860-1704 block heater on the 8v92 or convection heat?

On my 6v92 , I will feel the heat in the coolant cross over tube.

The manual tells me the block heater will heat the crankcase oil.
I am only see the coolant heater desciped in this tread.
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Martin OConnor
Novi, Michigan
1984 PT 35
1987 PT 40
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  #27  
Old 12-20-2018
Debugjaws Debugjaws is offline
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Quote:
Originally Posted by Eagle1 View Post
I ordered the 860-1704 from Napa.
The plug into the heater element is corroded . I am getting power to the plug.

Going to clean end and go from there.

My question is: is there a circulating pump that works with the 860-1704 block heater on the 8v92 or convection heat?

On my 6v92 , I will feel the heat in the coolant cross over tube.

The manual tells me the block heater will heat the crankcase oil.
I am only see the coolant heater desciped in this tread.
The block heater heats the coolant in the coolant jackets. It is not flowing, so convection is not occurring.

However, My 91 WB came with a Primus hydronic heating system for the coach. Part of the plumbing for this system is a set of heat transfer tubes which the heated coolant flows through en route to rest of the coaches heating system. The engine circulation pump that circulates the engine coolant from the block through a closed system that picks up heat from the heat transfer tubes. This also serves as a block heating system.

In either case, the engine is a huge chunk of metal that takes hours to heat to an effective start temperature. I generally run my block heater over night. It is warm to the touch near the heater and always fires right off in the morning when it has had sufficient time to heat.
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Gerry Lefebvre
Newberg, Oregon
91 WB 40'
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  #28  
Old 12-20-2018
MOConnor MOConnor is offline
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On my 6V92 the block heater heats the coolant with the element in the block and after a few hours I can feel the heat in the crossover pipe,
Not sure how this works with out some sort of pump.

Can you use the block element and the primis system at the same time.

Planning to install a webasco heating system to heat domestic water.
Or o larger webasco to preheat the engine and the domestic water.

Thank you
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Martin OConnor
Novi, Michigan
1984 PT 35
1987 PT 40
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  #29  
Old 12-20-2018
mpierce mpierce is offline
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You get convection going on. As water is heated at the element, it rises. Colder water sinks down, and gets warm. You get circulation going in. How much, and where it warms, depends on element placement and coolant passages in the engine.
Above zero, I figure minimum of four hours.
As it gets colder, and/or windier, it needs to be on longer.
Trucking, if it's below zero, -20 or so F, and windy, I want to plug it in the instant I turn engine off, and leave it on!
Usually doesn't apply to RV's!!!
One note.
Everything I've read says do NOT leave element on with engine running, to help warm up.
Element is too small to do much, but risk is of tiny bubbles in coolant, that attach to hot element, causing a risk of element overheating.
Probably small risk, but leaving element on doesn't speed warm up, so why risk it?
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Melvin and Charlene Pierce
Scranton, ND
"Smoke N Mirrors" Royale Conversion
1990 PT40WB
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  #30  
Old 12-20-2018
MOConnor MOConnor is offline
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I now understand how it works
Thank you!
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Martin OConnor
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1984 PT 35
1987 PT 40
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