carb problem
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- G-Major
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- Location: Fayetteville, Texas
carb problem
My jeep is running real rich. It smokes blue smoke. If I completely remove the air/fuel mixture screw it actually runs better. It is the original side draft ys. any ideas what might be my problem?
1941 Dodge WC-7 Command Car
1942 Ford GPW
1968 M151-A1
1967 M416
1945 Gemco 1/4 ton trailer
US Army 1979-1984
Houston Police Officer 1984-2016 (Retired)
1942 Ford GPW
1968 M151-A1
1967 M416
1945 Gemco 1/4 ton trailer
US Army 1979-1984
Houston Police Officer 1984-2016 (Retired)
- muttguru
- G-Colonel
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Re: carb problem
Has anyone been tampering with the Donaldson Valve (aka the PCV valve) ? A friend of mine was having similar problems and the cure was to correct the reassembly of the valve.
ken
ken
Contact address - muttguru@aol.com
Always wanted - Details and pictures of M416 Trailer data plates & M151 data plates & body-tags for my research. Thanks!
Always wanted - Details and pictures of M416 Trailer data plates & M151 data plates & body-tags for my research. Thanks!
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- G-Major
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Re: carb problem
hasn't been messed with it but I will certainly check it out..thanks
1941 Dodge WC-7 Command Car
1942 Ford GPW
1968 M151-A1
1967 M416
1945 Gemco 1/4 ton trailer
US Army 1979-1984
Houston Police Officer 1984-2016 (Retired)
1942 Ford GPW
1968 M151-A1
1967 M416
1945 Gemco 1/4 ton trailer
US Army 1979-1984
Houston Police Officer 1984-2016 (Retired)
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- Jeep Heaven
- Posts: 49841
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Re: carb problem
The YS Series M-38 and M-38A1 series carburetors will run rich when the rubber diaphragms develop internal leaks due to the age of the rubber. How long has the present carburetor been installed?
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
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- G-Major
- Posts: 811
- Joined: Sat Feb 22, 2003 4:17 pm
- Location: Fayetteville, Texas
Re: carb problem
I put a rebuild kit in it a couple of years ago. What should I look for on the PCV valve? I do remember taking it out and cleaning it. Can it be accidently installed backwards?
1941 Dodge WC-7 Command Car
1942 Ford GPW
1968 M151-A1
1967 M416
1945 Gemco 1/4 ton trailer
US Army 1979-1984
Houston Police Officer 1984-2016 (Retired)
1942 Ford GPW
1968 M151-A1
1967 M416
1945 Gemco 1/4 ton trailer
US Army 1979-1984
Houston Police Officer 1984-2016 (Retired)
- wingnut1
- G-Master Sergeant
- Posts: 110
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Re: carb problem
Hi. It is possible to put the P.C.V. valve on the wrong way on a M38A1 because it has male threads at both ends. However there should be an arrow stamped on to show the direction of flow towards the inlet. Hope this helps you as it did for me. Best regards Bernard.
GPW 205133 JUNE 1944 1953 M38A1 C.D.N.
- artificer
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Re: carb problem
Joel is probably on the money.
The vehicle is said to be running rich.
Removing the idle mixture screw is said to cause the engine to run better.
That is because removing the mixture screw introduces air into the idle circuit, leaning the mixture.
The vehicle is said to be running rich.
Removing the idle mixture screw is said to cause the engine to run better.
That is because removing the mixture screw introduces air into the idle circuit, leaning the mixture.
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.
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- G-Colonel
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Re: carb problem
Wouldn't rich mixture cause black smoke, and not blue?
Blue sounds more oil related, be it pcv, rings, or valve guides
Blue sounds more oil related, be it pcv, rings, or valve guides
GPW #3606 “LIBBY”
"Jeep is America's only real sports car." - Enzo Ferrari
"Jeep is America's only real sports car." - Enzo Ferrari
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Re: carb problem
Petrol/gasoline engine blue /black is harder to distinguish v/s a diesel engine.
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.
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- Jeep Heaven
- Posts: 49841
- Joined: Sun Mar 02, 2008 12:37 pm
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Re: carb problem
If the excess gas is getting into the base the diluted oil will wash by guides, Rings, guides, etc., and the exhaust can exhibit blue smoke.
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
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