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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Wed Jan 30, 2013 11:45 am Post subject: My YS Carburetor problem |
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Getting back to my carb problem I had in late November.
It was hard to start and keep running.
It finally got warm enough here in the last couple weeks to get in the shop and tinker with it. It was eating my lunch, as I thought that I had cleaned all the ports and crannies in it.
On initial cleaning I didn't remove any plugs, as I was afraid I might ruin or damage something on the body. So I just soaked the pieces real good in carb cleaner and roded the passages with small strand of wire and flushed with carb cleaner spray and compressed air.
After all that it still wouldn't perform correctly. Made sure there weren't any air leaks. Check the pump for proper pressure out.
I had a boss tell me once in my younger years, Ken, "don't ever give up".
I scratched my head and thought about it for awhile and decided I better go ahead and remove some plugs in the body.
I decided to start with the cast iron body because I figured it was prone to rust up inside. I removed all the hardware on it and pulled the copper plug out of it.
Lo and behold there was some blockage in the idle mixture port slot. I used a tiny screw driver to loosen up any particles in the cavity. But it wasn't as clean as it should be.
I decided heck I can't hurt anything so I placed it in the sand blasting cabinet and gave it a few shots with the compressed air and sand. I was using very fine sand. That took care of rest of the rust particles in the cavities.
I''m not afraid to remove plugs now.
I finished washing it out with carb spray and made sure there wasn't any sand in those cavities. Anyway got all the dust out of it. I did have to widen one of the holes in the gasket as it was covering too much of the hole passage.
I don't know what their problem is in making a good gasket
to fit the carburetor holes.
Installed the hardware back on it and mounted it to the rest of the carburetor. And finally back on to the manifold.Adjusted idle mixture screw 1 1/2 turns out. Poured gas in the thru the horn prior to cranking. It took a few times of cranking and running to get the carb bowl full.
Set the idle speed for comfortable idle speed. It was purring good. Let it warm up and readjusted the idle mixture screw for best mixture.
Wow, I thought it ran good before I started having this recent problem.
I'm not exagerating. It is better now with quick acceleration, has better pep, and easy to start. It stays running at low idle with out having to goose it occasionally. Kinda like that CW song..."Boot Scoot Buggy"
Varooom!! Varooom!! LOL!
Now I have another spare I'm working on. The one I broke the screw off in the throttle shaft. I ordered a set of taps and am waiting for it to come in to continuing with the repair.
And the taps just arrived as I'm typing.
I'm outa here.
Ken _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM |
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RICKG Member
Joined: Aug 31, 2010 Posts: 1740 Location: SO IDAHO
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Posted: Wed Jan 30, 2013 12:12 pm Post subject: |
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Good work Ken-these carbs can be tricky little devils!! _________________ keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a |
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Bretto Member
Joined: Nov 24, 2010 Posts: 1390 Location: Orem, UT
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Posted: Wed Jan 30, 2013 12:17 pm Post subject: |
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GREAT! Good job. I can tell you are a very happy with the results. _________________ Brett
'51 M38
PHOTO DIARY OF MY BUILD |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16253 Location: Wisconsin
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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Wed Jan 30, 2013 5:21 pm Post subject: |
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Look at the difference in two YS carburetors. The one on the right is the one I got running on the M38 in the last post.
The one on the left is a spare I bought from a individual, hoping to have a good running spare. I put a new kit in it. But it would only run with choke valve closed quite a bit. I took it a part and noticed some difference between it and the one I previously wrote about.
I wonder what kind of mix up I have here with the one on the left.
_________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16253 Location: Wisconsin
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DJ Member
Joined: Apr 15, 2005 Posts: 289 Location: Wis.
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Posted: Wed Jan 30, 2013 9:23 pm Post subject: |
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" It is common to see folks place a M38A1 YS950S main body on a M38 YS637S throttle body. "
Yup, I bought a "M38 carb" that had the A1 bottom on it. Took the civvy carb off and put the "M38" carb on and the jeep wouldn't run for crap. After much pain and suffering I found the switched bottom. Bought another m38 carb and problem was solved. So 2 carbs made into one wasted 2 carbs! _________________ 51 M38 ,52 M38 ,53 Jeep PU ,62 M 37 ,68 M 715 |
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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Wed Jan 30, 2013 9:59 pm Post subject: |
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Substituting a YS950S main body onto a YS637S throttle body is not suppose to work is it? It hasn't worked for me. And I don't see how it can work when the throat in the 950 is larger than the 637 throttle body flange hole. It would not start from stand still. I had to get pulled to get running. then I had to have the choke 75% closed to get it to stay running. I believe it was getting air into a port in the throttle valve because the main body being larger wasn't sealing the gasket over the X port. The bolts holes will line up perfect, But that's it. _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16253 Location: Wisconsin
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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Thu Jan 31, 2013 12:22 am Post subject: |
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Thanks Wes for clearing that up. I did take it that you were meaning it worked. I'll see if the individual has a remedy for this delema. _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM |
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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Sun Feb 03, 2013 8:09 pm Post subject: |
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One last question.
My thinking is it won't work, but I would like to know for sure so I don't have to remove the YS637s from the engine and visually compare.
The question: Will the the Horn section of the YS950S work with Lower main body section of the YS637S?
thanks
Ken _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16253 Location: Wisconsin
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Posted: Sun Feb 03, 2013 8:33 pm Post subject: |
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I am not sure. The part numbers for the horns are not even close. Nor are the part numbers for the horn to bowl gaskets. You don't have to remove the 637S from your engine to find out. Just remove the 637S's air horn and stick your 950S bowl under it right over the engine. Personally I think its a waste of time and money to jury rig a 950S to work on a M38. There will always be a ported vacuum issue with the throttle body vs the bowl and a flow rate issue withe the 950S metering system too high for the M38's fuel needs. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Sun Feb 03, 2013 9:15 pm Post subject: |
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Thanks for the reply Wes, I really don't to jury rig it either.
I think I'll just end up sending the mix match carburetor back.
Ken _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
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DJ Member
Joined: Apr 15, 2005 Posts: 289 Location: Wis.
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Posted: Sun Feb 03, 2013 9:40 pm Post subject: |
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Will they work?? Short answer, no! Mine would run ,barely and idle speed had to be 1500 rpms to half arse run, Iwould send it back if possible. _________________ 51 M38 ,52 M38 ,53 Jeep PU ,62 M 37 ,68 M 715 |
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