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Monarch 8.3 Cummins cooling system
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Supporting Member of Barthmobile.com 1/18
Picture of Steve VW
posted
Pretty slow around here lately. Time for some Tech Talk! Besides I haven't sparred with PB lately, feeling lucky...

Last fall one of the heater hoses under coach blew out. I bypassed the cab heat loop, refilled, and continued without engine cab heat. I planned to replace the hoses but considering the engine hoses are all 1995 OEM, I decided it made more sense to replace engine cooling hoses first, then worry about the forward cab heat lines.

Since the old parts were so dirty, it was harder to get good photos. Instead, I took photos as I reassembled and reversed the order.

Some old bloated hoses:



Here we go:



The outlet elbow is at the top rear. I removed the elbow and the air bleed lines. Removed the belt and the alternator bolts.



Since the cooling pipes were rusty I removed them for cleaning and painting.



The outlet pipe is attached to the thermostat housing with two bolts. Two more and the housing comes off. I left the belt tensioner and the alt mount attached.



Below the housing are the 2 thermostats:



Now for the fun part. Behind and below the thermostat housing are the water inlet elbow and 2 heater hose connections.



A real PITA to get that elbow in there... this turned out to be the worst part of the job. I "greased" the hose end and stump with RTV sealer (very slick) and forced it on with fingers and a metal "shoehorn."



The lower pipe has a tap for the 1" filler hose from the reservoir.



Rather than straight to the rad it forms a loop forward through the power steering cooler, then back to the radiator. There is also a short 5/8" hose that comes from the block.



Found a good replacement for the upper elbow. Enough extra for the coupler hose below.



Engine parts you will need:

-Inlet elbow: Cummins 3920762
-Outlet gasket: Cummins 3918779
-2 thermostats: Cummins 3928639
-Thermostat housing gasket: Cummins 3914310

The rest are hoses and couplers.

-1 outlet elbow hose 2 1/4"
I used a Dayco 70921 hose. (Trim to fit, the extra can be used for the 2 1/4" coupler below)

-2 reducers: 2 1/2" x 2 1/4"
One for the front end of the cooler, one for the front upper radiator pipe

-1 straight coupler 2 1/4"
rear end of cooler to engine pipe

-1 straight coupler 2 1/2"
rear lower radiator pipe

-5/8" heater hose for the heater loop forward and the bypass on the engine block.

-1" heater hose (6 ft) for the filler line.

It took about 9 gallons of coolant to fill the system. I did not completely drain the block, I suspect a complete fill would be about 10 gallons.

This means I have now replaced every rubber coolant component. I believe most were 1995 vintage. Now I can trust them. I can get back to those darn heater lines without worrying about my friendly Cummins.


9708-M0037-37MM-01
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 300 hp
 
Posts: 3701 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 7/17
Picture of Mogan David
posted Hide Post
excellent photo story with clear images
 
Posts: 1956 | Location: Jackson, Michigan, USA | Member Since: 04-18-2004Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 1/18
Picture of Steve VW
posted Hide Post
quote:
Originally posted by Mogan David:
excellent photo story with clear images


Thanks, Mark. Thumbs Up (That's why I use a camera to take pictures, not a phone)

Things have been slow here lately. Heck, last week I couldn't even spell deesil mekanik, now I am one! Mechanic


9708-M0037-37MM-01
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 300 hp
 
Posts: 3701 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 1/18
Picture of Dana
posted Hide Post
Thanks Steve Superman you da man!

I imagine that ours should be pretty close to the same. Now I have a personalized play book with part numbers to purchase ahead of even starting the process. You even pointed out the stress creators to make sure to tackle those parts with the right attitude. Thumbs Up

Photo bucket played nice with you. Camera instead of phone is a great hint. It is just so handy to use the phone because some of us have it nearly glued to our hands for work....... Thumbs Down


Dana & Lynn
1996 38ft Monarch front entry
Spartan Mountain Master Chassis
Cummins 8.3
Allison MD-3060 6 speed
22.5 11R
Cummins Factory Exhaust Brake
Midnight Star

1994 34ft Side Entry Aristocrat Currently FOR SALE
Christened - DBarth
Spartan Chassis
6BTA 5.9L 230hp Cummins
Allison MD-3060 6 speed
15040S Eaton rear
Banks PowerPack brings HP 268
PacBrake
ProSine 2.5 Watt Inverter/Charger
Build Number#3895

1972 22ft
Christened Camp Barth
No motor, no tranny, no running water
Electric 110 and 12 volt intact and running
Still mobile as a toad with newer brakes, tires and lights
Has Original Fridgeking Air conditioner so far
 
Posts: 757 | Location: Waseca, Minnesota | Member Since: 12-09-2010Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 1/18
Picture of Steve VW
posted Hide Post
I thought you, Deb&Ed and Wally might find it useful, hopefully others. Evidently my posts get some outside attention as well. My 454HO Engine Swap thread is my top seller, with over 48,000 views now! confusion

The newer phones have better cameras but my $35 Iphone4 has no zoom or macro. I find both useful for the close up work. Also, it seems to have a mind of its own as to orientation, sometimes it gets sideways for no reason...

My little Nikon seems to get the job done and it has lasted for years already.

Have Barth, will travel, soon Tooling Along


9708-M0037-37MM-01
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 300 hp
 
Posts: 3701 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
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