Create an account Home  ·  ·  Forums  ·  ·  Articles  ·  ·  Downloads  ·  ·  Photo Gallery  
Login
Nickname

Password

Don't have an account yet? You can create one here.

Navigation
· Home
· Article Archive
· Article Submit
· Downloads
· FAQ
· Forums
· Members List
· Photo Gallery
· Private Messages
· Web Links
· Your Account

Search Articles



Forums

Cross Member Radiator Tabs
Cross Member Radiator Tabs
WTB M38 distributor breaker plate tabs
Hodakaguy M38 Misc Thread
1950 M38 no reading on the dash amp meter
Transfer Case rebuild issues
Zerks causing trouble.
1952 M38 converting to 12V
M38A1 Slave Bucket location
M274 A3 Mule For Sale

Willys M Jeeps Forums


willysmjeeps.com :: View topic - Flooded YS637
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Flooded YS637
Goto page 1, 2  Next
 
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base
View previous topic :: View next topic  
Author Message
RICKG
Member


Joined: Aug 31, 2010
Posts: 1740
Location: SO IDAHO
PostPosted: Thu May 09, 2013 8:23 am    Post subject: Flooded YS637 Reply with quote
My M-38 has run perfectly for months now and suddenly it's as if
you're pulling the choke full out on a warm engine. Pulled the airhorn
and there's fuel even in the hose to the crossover tube!!
1. The float is set at .188 from the airhorn surface and it should be
.25 from the surface (excluding the gasket)-correct me if i'm wrong.
How the heck did it run so well at .188?? I can't imagine the float tang
bending during use..
2. The needle valve and seat appear clean and servicable.

I'll reset the float to .25 (excluding the gasket) this PM.

Ideas??
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
Back to top
View user's profile Send private message Send e-mail
timjuhl
Member


Joined: Jun 27, 2011
Posts: 262
Location: "Thumb" of Michigan
PostPosted: Thu May 09, 2013 7:32 pm    Post subject: YS problems Reply with quote
The YS in my M38A1 was flooding out because a pinhole leak had opened up in the casting between the fuel inlet area and the float chamber. Plugged it up and back in business. Not something you would expect to see.

Tim
http://i30.photobucket.com/albums/c318/champ81L/Jeep/Holy_carb.jpg
_________________
Tim Juhl
1952 M38A1
1946 Aeronca L16A Army Liaison Aircraft
Back to top
View user's profile Send private message
RICKG
Member


Joined: Aug 31, 2010
Posts: 1740
Location: SO IDAHO
PostPosted: Fri May 10, 2013 6:59 am    Post subject: Reply with quote
You must sport 20/20 vision to have spotted that pinhole Tim.
I reset my float to .25 spec. The needle in the valve is a 3pc setup w/needle, spring and plunger, the spring was slightly compressed
so i stretched it maybe .032. Slapped it back together and we're
good to go. The smallest adjustments made a big difference-
finicky little devils..
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
Back to top
View user's profile Send private message Send e-mail
RICKG
Member


Joined: Aug 31, 2010
Posts: 1740
Location: SO IDAHO
PostPosted: Mon May 13, 2013 7:44 am    Post subject: Reply with quote
Still no joy in YS637 land. Went for short drive yesterday +- 15mi
and still flooding. Pulled the top and drained just slightly less than
1-3/4 oz fuel from the bowl (55cc in a dose syringe). Then pulled the complete carb and see 1/4" raw fuel in the intake manifold.
Count on this to rear it's ugly head when you're preparing for
your 1st MV rally-Idaho Motor Pool June 05-08.
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
Back to top
View user's profile Send private message Send e-mail
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 16250
Location: Wisconsin
PostPosted: Mon May 13, 2013 8:31 am    Post subject: Reply with quote
Are you using the needle only type or the needle and spring type for the float. You may need the spring type. What is the fuel pressure coming from the pump?
_________________
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
Back to top
View user's profile Send private message Send e-mail Visit poster's website
RICKG
Member


Joined: Aug 31, 2010
Posts: 1740
Location: SO IDAHO
PostPosted: Mon May 13, 2013 10:28 am    Post subject: Reply with quote
It is needle/spring type. I'll put it back together and get a pressure reading at the pump 1st oportunity. Can an accurate pressure reading be
obtained by simply cranking the engine w/starter or should i put it back
together and run it for best results..
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
Back to top
View user's profile Send private message Send e-mail
Balvar24
Member


Joined: Sep 05, 2009
Posts: 191
PostPosted: Mon May 13, 2013 1:42 pm    Post subject: Reply with quote
It's a positive displacement pump, so spinning fast/slow does little to the pressure, only the rate of fuel transfer. Turning it over should be fine.
Back to top
View user's profile Send private message
RICKG
Member


Joined: Aug 31, 2010
Posts: 1740
Location: SO IDAHO
PostPosted: Mon May 13, 2013 2:14 pm    Post subject: Reply with quote


I have on the bench 2 different meters that belonged to my bro.
I've never used them or been instructed on their use-which begs the question, can i plug the meter hose direct to the fuel pump outlet line
or should it be "T"eed in to a complete closed system.. would it make a difference? I hope "the only dumb question
is the one not asked" axiom applies here..
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
Back to top
View user's profile Send private message Send e-mail
Cacti_Ken
Member


Joined: Apr 20, 2005
Posts: 1021
Location: Silsbee, Texas
PostPosted: Mon May 13, 2013 3:28 pm    Post subject: Reply with quote
RICKG wrote:


I have on the bench 2 different meters that belonged to my bro.
I've never used them or been instructed on their use-which begs the question, can i plug the meter hose direct to the fuel pump outlet line
or should it be "T"eed in to a complete closed system.. would it make a difference? I hope "the only dumb question
is the one not asked" axiom applies here..


Yes you can put the hose on the fuel pump outlet line, but if you don't have some sort of clamp on the hose and line it might blow off and squirt gas all over the place. I can't tell what the ranges in PSI are of the guages you have. If they are strictly for measureing vacuum, you can't use them to test for pressure. You must use a pressure gauge that measures in PSI. For a good test You will want to use a guage that has low pressure range like 0-20 or 0-30 PSI. Not one that reads to 0-100 PSI.
_________________
Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM
Back to top
View user's profile Send private message Send e-mail
RICKG
Member


Joined: Aug 31, 2010
Posts: 1740
Location: SO IDAHO
PostPosted: Mon May 13, 2013 4:50 pm    Post subject: Reply with quote
Thx guys for the replies-yes both gages read fuel pump pressure
in the low range 0-30psi. I'll hook it up tonite and reply back.
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
Back to top
View user's profile Send private message Send e-mail
RICKG
Member


Joined: Aug 31, 2010
Posts: 1740
Location: SO IDAHO
PostPosted: Tue May 14, 2013 10:46 am    Post subject: Reply with quote
The gage in the top foto reads in the 0-10 psi range.
With that gage and a 20 sec crank with the starter it
builds up to 4 psi and holds steady. TM9 8012 pg 151
specs 4-5.25 psi @ 1800 rpm so i'm not experiencing
excessive pressure from the fuel pump. Based on this
i suspect the needle valve and seat aren't holding back the
fuel even tho the float level is set at .25". So i'm on the
hunt for a new needle valve and seat. I don't suppose
any of the vendors sell just the valve-probably will have
to purchase the whole rebuild kit.
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
Back to top
View user's profile Send private message Send e-mail
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 16250
Location: Wisconsin
PostPosted: Tue May 14, 2013 9:17 pm    Post subject: Reply with quote
Is the needle or seat damaged? IE scratches or burrs? Are you sure the float integrity is ok and it's not getting heavy with gas leaking into it?

Try the carburetor shop for a replacement needle & seat set.
http://www.thecarburetorshop.com/index.htm
_________________
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
Back to top
View user's profile Send private message Send e-mail Visit poster's website
RICKG
Member


Joined: Aug 31, 2010
Posts: 1740
Location: SO IDAHO
PostPosted: Wed May 15, 2013 7:07 am    Post subject: Reply with quote
wesk wrote:
Is the needle or seat damaged? IE scratches or burrs? Are you sure the float integrity is ok and it's not getting heavy with gas leaking into it?

Try the carburetor shop for a replacement needle & seat set.
http://www.thecarburetorshop.com/index.htm


The spring inside the needle is slightly deformed. Float integrity is good.
Thx for the link-i'll give them a shout.
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
Back to top
View user's profile Send private message Send e-mail
RICKG
Member


Joined: Aug 31, 2010
Posts: 1740
Location: SO IDAHO
PostPosted: Wed May 15, 2013 9:19 am    Post subject: Reply with quote
No joy @ the carb shop. Sold as complete kit only $125 + ship OUCH!!

Then and Now complete kit only $65 + ship. Placed my order with Tony
and my kit is on its way.
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
Back to top
View user's profile Send private message Send e-mail
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 16250
Location: Wisconsin
PostPosted: Wed May 15, 2013 8:44 pm    Post subject: Reply with quote
Is that kit the same as the dual application $55 kit that Midwest & AJP sell.
Or maybe the same as $35 G503 parts M38 or A1 specific kit?
_________________
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
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base All times are GMT - 6 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001 phpBB Group
Forums ©

 



PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.