Scoutpilot, the vacuum reading was 18.5 psi with a slight fluttering of the needle.
The range of the needle flutter was about 0.5 psi (0.25 psi in each direction).
Sound like an unsuccessful carb rebuild to you?
Carb Rebuild YS - missing discharge check ball and weight.
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Re: Carb Rebuild YS - missing discharge check ball and weight.
42 GPW #91366, recovered blue drab registration 20200841, unit markings 104-415-I HQ-21 (Timberwolves)
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Re: Carb Rebuild YS - missing discharge check ball and weight.
18.5 Hg (inches of mercury) is not bad. The slight flutter may indicate a lean mixture. Balancing the Idle Stop Screw (vacuum) on the throttle lever with the Idle mixture screw (fuel flow) is very important. Watching the vacuum gauge, turn the Idle Stop Screw out until the vacuum is at its highest. Then adjust the mixture screw to set the idle RPM. I like 650-700.
'70-'71 'A' Batt., 377th FA, 101AB
(Slicks and LOH's)(Col's LOH Pilot)
'71-72 CHARLIE TROOP,
16TH AIR CAV, 1ST AVN BDE (AEROSCOUTS)
LOW LEVEL HELL.
'46 CJ2A
'47 CJ2A
'48 CJ2A
'48 B1PW126
'69 CJ5
(Slicks and LOH's)(Col's LOH Pilot)
'71-72 CHARLIE TROOP,
16TH AIR CAV, 1ST AVN BDE (AEROSCOUTS)
LOW LEVEL HELL.
'46 CJ2A
'47 CJ2A
'48 CJ2A
'48 B1PW126
'69 CJ5
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- Sergeant Major of the Gee
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Re: Carb Rebuild YS - missing discharge check ball and weight.
Unfortunately, idle stop and mixture screw adjustments did not improve performance.
This M38 remains hard to start, hard to keep running, and the off-idle bog remains.
Perhaps a passage is blocked or my rebuild fell short.
This YS637S is coming to you Scoutpilot.
Curious to see what you find.
This M38 remains hard to start, hard to keep running, and the off-idle bog remains.
Perhaps a passage is blocked or my rebuild fell short.
This YS637S is coming to you Scoutpilot.
Curious to see what you find.
42 GPW #91366, recovered blue drab registration 20200841, unit markings 104-415-I HQ-21 (Timberwolves)
CJs (x 4)
CJs (x 4)
- Scoutpilot
- G-Lieutenant General
- Posts: 7329
- Joined: Sun May 28, 2006 1:22 pm
- Location: Asheboro, NC
Re: Carb Rebuild YS - missing discharge check ball and weight.
Roger that.
'70-'71 'A' Batt., 377th FA, 101AB
(Slicks and LOH's)(Col's LOH Pilot)
'71-72 CHARLIE TROOP,
16TH AIR CAV, 1ST AVN BDE (AEROSCOUTS)
LOW LEVEL HELL.
'46 CJ2A
'47 CJ2A
'48 CJ2A
'48 B1PW126
'69 CJ5
(Slicks and LOH's)(Col's LOH Pilot)
'71-72 CHARLIE TROOP,
16TH AIR CAV, 1ST AVN BDE (AEROSCOUTS)
LOW LEVEL HELL.
'46 CJ2A
'47 CJ2A
'48 CJ2A
'48 B1PW126
'69 CJ5
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- G-Lieutenant General
- Posts: 5638
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Re: Carb Rebuild YS - missing discharge check ball and weight.
Great decision !!JeepdaddyRC wrote: ↑Sat Jan 21, 2023 1:46 pmUnfortunately, idle stop and mixture screw adjustments did not improve performance.
This M38 remains hard to start, hard to keep running, and the off-idle bog remains.
Perhaps a passage is blocked or my rebuild fell short.
This YS637S is coming to you Scoutpilot.
Curious to see what you find.
You can't beat Scout Pilot's skill set and quality control methods in his rebuilds !
I sent old and some frozen carbs to him, and they came back like factory fresh.
He also rebuilt my fuel-vacuum pump assembly as well for my M38-A1.
Best Regards,
Ray
Last edited by 70th Division on Sun Jan 22, 2023 6:25 am, edited 1 time in total.
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Re: Carb Rebuild YS - missing discharge check ball and weight.
Scoutpilot,
I will be getting in touch with you soon, as I have some more carbs to send your way
Best Regards,
Ray
- Scoutpilot
- G-Lieutenant General
- Posts: 7329
- Joined: Sun May 28, 2006 1:22 pm
- Location: Asheboro, NC
Re: Carb Rebuild YS - missing discharge check ball and weight.
Copy that.
'70-'71 'A' Batt., 377th FA, 101AB
(Slicks and LOH's)(Col's LOH Pilot)
'71-72 CHARLIE TROOP,
16TH AIR CAV, 1ST AVN BDE (AEROSCOUTS)
LOW LEVEL HELL.
'46 CJ2A
'47 CJ2A
'48 CJ2A
'48 B1PW126
'69 CJ5
(Slicks and LOH's)(Col's LOH Pilot)
'71-72 CHARLIE TROOP,
16TH AIR CAV, 1ST AVN BDE (AEROSCOUTS)
LOW LEVEL HELL.
'46 CJ2A
'47 CJ2A
'48 CJ2A
'48 B1PW126
'69 CJ5
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