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06-12-2021, 06:01 PM
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#1
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Senior Member
Join Date: Mar 2016
Posts: 107
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Air pumping into coolant bottle. 1997 8.3 Cummins 300hp all mechanical no electronic
Hello everyone,
Real quick question. I on a 1998 American Tradition with a 1997 8.3C all mechanical engine. No electronics. Luckily me. Allison transmission 3360.
My question when at idle I have air pumping into my over flow bottle. Touch the throttle and it stops. I have memory issues. So what is my problem? Yes, it is a 1997 engine.
Thank you for any help.
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06-12-2021, 06:10 PM
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#2
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Senior Member
Join Date: Mar 2016
Posts: 107
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Sorry my bad, it's a 1997 engine on a 1998 chassis
__________________
1998 Fleetwood American Tradition 40VS
Cummins C8.3 300 HP Mechanical Injection Pump
Allison Transmission
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06-12-2021, 06:11 PM
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#3
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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Is the engine oil milky?
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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06-12-2021, 06:48 PM
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#4
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Senior Member
Join Date: Mar 2016
Posts: 107
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No, that is the first thing i looked at
__________________
1998 Fleetwood American Tradition 40VS
Cummins C8.3 300 HP Mechanical Injection Pump
Allison Transmission
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06-12-2021, 06:59 PM
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#5
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,971
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Has the coolant been recently changed or was very low then refilled? Does this happen when the engine is cold and/or hot?
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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06-12-2021, 07:03 PM
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#6
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Senior Member
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,868
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I do not know that the below would fix your problem.
Try "burping" the coolant system.
On my 1995 there is a valve that can be opened with the engine running to bleed air out of the cooling system. It is in a line behind the top of the coolant reservoir.
This needs to be done whenever changing the coolant or adding a big volume of coolant to replenish the coolant level. This I have learned from experience and from the manual.
I suspect one could accomplish the same feat by running the engine with the radiator cap off for awhile.
__________________
Dean
1995 38' CC Magna #5280 **** Sold after 21 years of enjoyment.
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06-12-2021, 07:37 PM
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#7
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Senior Member
Join Date: Mar 2016
Posts: 107
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No the coolant has not been changed. It does it at first start up and all the way to operating temp of 180 deg. Touch the throttle and it stops
__________________
1998 Fleetwood American Tradition 40VS
Cummins C8.3 300 HP Mechanical Injection Pump
Allison Transmission
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06-12-2021, 09:08 PM
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#8
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Senior Member
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,868
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Ok, it would be best not to try. 
__________________
Dean
1995 38' CC Magna #5280 **** Sold after 21 years of enjoyment.
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06-13-2021, 04:52 PM
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#9
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Senior Member
American Coach Owners Club
Join Date: Apr 2016
Location: North Florida
Posts: 2,474
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Close inspection of radiator cap may show hard non-sealing gasket or better yet, if it's the original cap, probably be best to replace it. Be sure to get the same pressure rating.
__________________
1999 American Eagle
ASE med/heavy certified technician
ASE advanced diesel certified
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06-13-2021, 05:06 PM
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#10
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Senior Member
Join Date: Jul 2014
Posts: 35,442
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You need to find out if its " AIR " or " Combustion Gas's " in your coolant.
There are test kits avalable.
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06-14-2021, 05:41 AM
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#11
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Senior Member
Join Date: Mar 2016
Posts: 107
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If it is combustion gas then why does it stop when off of idle? You would think it would get worse.
__________________
1998 Fleetwood American Tradition 40VS
Cummins C8.3 300 HP Mechanical Injection Pump
Allison Transmission
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06-14-2021, 05:41 AM
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#12
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Senior Member
Join Date: Mar 2016
Posts: 107
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I will check that , thanks
__________________
1998 Fleetwood American Tradition 40VS
Cummins C8.3 300 HP Mechanical Injection Pump
Allison Transmission
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06-14-2021, 06:56 AM
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#13
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Senior Member
Join Date: Jul 2014
Posts: 35,442
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Quote:
Originally Posted by badturks5
If it is combustion gas then why does it stop when off of idle? You would think it would get worse.
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If its air, why would it stop off idle ?
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06-14-2021, 08:47 AM
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#14
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Senior Member
American Coach Owners Club
Join Date: Apr 2016
Location: North Florida
Posts: 2,474
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Its rare, but air compressor can leak air into coolant system at compressor head gasket.
But if so, it ain't no tiny bubbles, it'll blow coolant and lots of it until the air governor pops off
Only real way to tell is to remove coolant lines from compressor and plug off or put together so compressor is out of coolant system loop
Try squeezing a radiator hose and see if it's got lots of pressure be while engine cold....if so it'll be hard to mash together
__________________
1999 American Eagle
ASE med/heavy certified technician
ASE advanced diesel certified
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