Over flowing radiator
-
- G-First Sergeant
- Posts: 143
- Joined: Wed Apr 04, 2012 7:43 pm
Over flowing radiator
When I first start up my m38a1 antifreeze pours out the overflow tube it also flows out the top of my radiator when I stop engine and undo the cap. This happens when antifreeze is cold. What causes this?
-
- Gee Addict
- Posts: 45180
- Joined: Sun Mar 02, 2008 2:37 pm
- Location: Proving Ground
Re: Over flowing radiator
Is it a 4# CAP Does it have a rubber seal on the valve or is it the early type that is used with the fiber seal in the filler neck?
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
- artificer
- - R.A.E.M.E -
- Posts: 13047
- Joined: Tue Jul 11, 2006 11:46 am
- Location: Year round sunshine on the Gold Coast, SE QLD AU
Re: Over flowing radiator
First the coolant should not be filled right to the top but about 2 knuckles under the bottom of the filler neck.
Leave the cap off & startup if there are bubbles it is indicative of a blown head gasket.
If so, check by doing a compression test 'properly'.
Leave the cap off & startup if there are bubbles it is indicative of a blown head gasket.
If so, check by doing a compression test 'properly'.
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
-
- Gee Addict
- Posts: 45180
- Joined: Sun Mar 02, 2008 2:37 pm
- Location: Proving Ground
Re: Over flowing radiator
M-38A1 is usually not that touchy with correct cap.
Does your engine still have the bypass elbow between the head and the waterpump?
Again which cap do you have?
Does your engine still have the bypass elbow between the head and the waterpump?
Again which cap do you have?
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
-
- G-First Sergeant
- Posts: 143
- Joined: Wed Apr 04, 2012 7:43 pm
Re: Over flowing radiator
Will check on the bypass elbow.
-
- G-First Sergeant
- Posts: 143
- Joined: Wed Apr 04, 2012 7:43 pm
Re: Over flowing radiator
It looks like I might have a head gasket blown because when I start it up it blows grey smoke out the exhaust. Also I have the cap with the rubber seat in it. I think it is smaller than the neck.
- artificer
- - R.A.E.M.E -
- Posts: 13047
- Joined: Tue Jul 11, 2006 11:46 am
- Location: Year round sunshine on the Gold Coast, SE QLD AU
Re: Over flowing radiator
To work as intended radiator caps must be the correct length for the rubber or composite material to seat in the radiator neck.
Blown head gasket will show on a properly conducted compression test or bubbles will show up in the radiator on a leak down test isolating 1 or more cylinders.
Smoke can be indicative of many things & grey is not usually associated with head gasket, white is.
Blown head gasket will show on a properly conducted compression test or bubbles will show up in the radiator on a leak down test isolating 1 or more cylinders.
Smoke can be indicative of many things & grey is not usually associated with head gasket, white is.
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
-
- Gee Addict
- Posts: 45180
- Joined: Sun Mar 02, 2008 2:37 pm
- Location: Proving Ground
Re: Over flowing radiator
Can you post a pic of the type radiator cap you are using? If the valve on the cap has the rubber seal, there is no ned for the fibre seal in the neck. Steam upon start up is not a good sign. Does it stop after a few seconds?
Evidence of coolant in a cylinder is indicated by a spark plug with little or no deposits when compared to the others, also, rust may be on the tip of the spark plug in the affected cylinder.
Removing the spark plugs will give you a quick answer.
Evidence of coolant in a cylinder is indicated by a spark plug with little or no deposits when compared to the others, also, rust may be on the tip of the spark plug in the affected cylinder.
Removing the spark plugs will give you a quick answer.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
Who is online
Users browsing this forum: Bing [Bot] and 4 guests