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Old 06-15-2017, 12:27 PM   #1
Mini-Skoolie
 
Join Date: Jul 2016
Location: Colorado
Posts: 49
Year: 1998
Coachwork: BlueBird
Chassis: TC2000FE
Engine: 5.9L Cummins ISB
Rated Cap: 71
5.9 leak at thermostat housing

Greetings bus gurus! My 5.9 developed a coolant leak last weekend, and I'm looking for some advice/expertise. I have attached a few photos for reference.
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At first I thought (was really hoping) the leak was just the 90 hose at the thermostat housing, but I have replaced that to find out that it is actually the housing itself that has a crack. Has anyone else encountered this issue?

I have purchased:
1 - new 180F thermostat
1 - new housing
1 - new bolts
1 - weird ass gasket
1 - new serp belt

A few questions:
1. Should I use RTV in addition to the gasket to ensure a leakproof seal between the housing, hoist bracket, and motor? (what a crazy design....)
2. I'm gonna be right there, what about replacing the alternator as well?
3. Any other advise, thoughts?

Thx!
Attached Images
File Type: jpg Leak full view.jpg (158.3 KB, 6 views)
File Type: jpg Leak close up.jpg (110.7 KB, 32 views)
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Old 06-15-2017, 12:38 PM   #2
Mini-Skoolie
 
Join Date: Jul 2016
Location: Colorado
Posts: 49
Year: 1998
Coachwork: BlueBird
Chassis: TC2000FE
Engine: 5.9L Cummins ISB
Rated Cap: 71
Quickserve parts diagram

Here's the parts breakdown from Cummins Quickserve. Part #2 is literally a rubber cylinder that I guess makes the seal between the motor and thermostat housing. It bridges the gap that the hoist hook makes.....
Attached Files
File Type: pdf Leak Quickserve diagram.pdf (202.0 KB, 54 views)
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5.9, coolant leak, cummins, thermostat

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