Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

Deere Stx38 Not Starting


  • Please log in to reply
14 replies to this topic

#1 lyall ONLINE  

lyall

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 2180
  • 1,747 Thanks
  • 1,398 posts
  • Location: State Center, Iowa

Posted April 09, 2014 - 09:22 PM

this is my neighbors  STX38

it has been setting few around 5 years in his shed

 

I like working on the 110's and the 200's series garden tractors

the STX38 is new to me

 

what I have done so far

 

checked the tank - empty

checked the carb fuel bowl - clean

checked the valves - not sticking

battery in dead - using one of mine

 

it acts like it wants to fire - but it did not

checked the spark - good blue spark

checked the fuel  - new fuel

got a new spark plug - set the gap

cleaned the flywheel -magnets and the ignition module - had rust on both

 

it pops a little 

checked the muffler - removed it

the pipe going the the muffler is broken off

I think because one of the bolts holding it was gone 

getting it fixed - before I try again

 

 

I am getting gas to the spark plug and good spark

there is not much to check 

 

the CV12.5S sure is different from the K181, K241, K301, and the K321

 

I sure like working the K series a lot more

 

I have working on several B&S 5 hp and have no problems with them

 

is the flywheel key the same as on a B&S?

if it is broken and bent a little than it would not start and run

checked Deere part site and they state that the shaft key is Alloy not steel like the K series

 

I hope it is the shaft key - that would be too simple

 

 

can anybody get me going in the right direction to get it running again

 

thanks



#2 Trav1s ONLINE  

Trav1s

    Got points?

  • Senior Member
  • Member No: 5472
  • 2,603 Thanks
  • 3,750 posts
  • Location: Cedar Rapids, IA

Posted April 10, 2014 - 07:44 AM

Have you tried spraying carb cleaner in it when you crank it?  Or a bit of gas in the carb?



#3 lyall ONLINE  

lyall

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 2180
  • 1,747 Thanks
  • 1,398 posts
  • Location: State Center, Iowa

Posted April 10, 2014 - 11:40 AM

Travis

Yes I have tried a little gas in the carb

after cranking for a while I checked the plug and it is wet

I quess I have to pull the flywheel and check the shaft key


  • Trav1s said thank you

#4 Trav1s ONLINE  

Trav1s

    Got points?

  • Senior Member
  • Member No: 5472
  • 2,603 Thanks
  • 3,750 posts
  • Location: Cedar Rapids, IA

Posted April 11, 2014 - 07:44 AM

I think you are onto something with the key on the flywheel.  



#5 jd.rasentrac OFFLINE  

jd.rasentrac

    Admirer of DEERE enjoyneering and design!

  • Senior Member
  • Contributor
  • Member No: 10327
  • 4,444 Thanks
  • 3,991 posts
  • Location: Niedervorschütz, Hessen, Deutschland

Posted April 11, 2014 - 10:38 AM

Attached File  240.pdf   5.6KB   47 downloads Attached File  241.pdf   5.86KB   38 downloads Attached File  237.pdf   44.06KB   34 downloads

 

Hello lyall, this is help from the official Answer Center / Ask John Deere - Engine Will Not Start (Lawn Tractor) site. In the Answer Center you'll find answers for different questions


  • lyall said thank you

#6 lyall ONLINE  

lyall

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 2180
  • 1,747 Thanks
  • 1,398 posts
  • Location: State Center, Iowa

Posted April 11, 2014 - 01:54 PM

thanks Wolfgang

downloaded the files and read them

it was no help

 

I check the mag gap - .010

plug at .040

gas is new

gas on the plug - so I know it is getting gas

checked the spark - it is good

tried starting fluid - pop or two - but does not start

 

battery is full charged

 

I did put in a new shaft key - the old one is broke

 

I do not what else to try 

 

need more help!

 

thanks



#7 Trav1s ONLINE  

Trav1s

    Got points?

  • Senior Member
  • Member No: 5472
  • 2,603 Thanks
  • 3,750 posts
  • Location: Cedar Rapids, IA

Posted April 11, 2014 - 02:00 PM

Carbon build-up on a valve preventing it from fully closing?  Bad headgasket?  Pull the head and take a looksie would be my next step.



#8 jd.rasentrac OFFLINE  

jd.rasentrac

    Admirer of DEERE enjoyneering and design!

  • Senior Member
  • Contributor
  • Member No: 10327
  • 4,444 Thanks
  • 3,991 posts
  • Location: Niedervorschütz, Hessen, Deutschland

Posted April 11, 2014 - 02:39 PM

that's not good, lyall. here some simple thoughts, you had certainly, too:

 

you need only three things, to run an engine: fuel, air and an ignition spark - and if all this parts handle in the right time, something must happen. the next step can only be to proof the proportions of the parts (sorry, but it's hard to me to find the right words).

 

i think the only way to find this failure is to suspend the things, that are ok.

 

is the right voltage at the spark...

has the engine compression...

 

yep, basic questions, but... I've no more ideas


Edited by jd.rasentrac, April 11, 2014 - 02:40 PM.

  • lyall said thank you

#9 lyall ONLINE  

lyall

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 2180
  • 1,747 Thanks
  • 1,398 posts
  • Location: State Center, Iowa

Posted April 11, 2014 - 03:26 PM

would a blown head gasket stop it from starting

 

what I am thinking if the head gasket is blown the compress would drop so that is would not start

there is a blow by from under the cylinder 

too low compress I do not think it would start

 

what do you all think about it

 

thanks



#10 Trav1s ONLINE  

Trav1s

    Got points?

  • Senior Member
  • Member No: 5472
  • 2,603 Thanks
  • 3,750 posts
  • Location: Cedar Rapids, IA

Posted April 12, 2014 - 05:27 PM

If the leak was bad enough it could prevent it from starting. I am still thinking carbon that prevents a valve from closing.
  • lyall said thank you

#11 lyall ONLINE  

lyall

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 2180
  • 1,747 Thanks
  • 1,398 posts
  • Location: State Center, Iowa

Posted April 18, 2014 - 09:10 PM

got a new head gasket

the old head gasket about 1" of the head gasket was gone

got the the new head gasket on and the it all put back together

started and is running

but it is over revving

I will work on it tomorrow

have to get a new battery for my laser tach



#12 Trav1s ONLINE  

Trav1s

    Got points?

  • Senior Member
  • Member No: 5472
  • 2,603 Thanks
  • 3,750 posts
  • Location: Cedar Rapids, IA

Posted April 19, 2014 - 05:24 PM

How goes today's progress?

#13 lyall ONLINE  

lyall

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 2180
  • 1,747 Thanks
  • 1,398 posts
  • Location: State Center, Iowa

Posted April 19, 2014 - 10:16 PM

can't stop it from over revving

at full throttle is is just under 5000 rpm

at half throttle it is around 3500 rpm

at low ldle it is around 1250 rpm

 

set the governor per the manual 

still no change

 

called a friend that sold and repair Cubs

he said it might be the governor spring

but he said I can set the governor back a little and keep checking as I back off the governor and see if that slows the rpms down

 

looked up the governor (part number 1204305-S) and there are no springs for it just the weights

 

so I hope by adjusting the governor arm back a little will fix the problem

oh this is going to be fun

 

oh the stx38 has a safety switch for the seat so I put a 50- lb weight on the seat so that I can work on the motor


  • jd.rasentrac said thank you

#14 lyall ONLINE  

lyall

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 2180
  • 1,747 Thanks
  • 1,398 posts
  • Location: State Center, Iowa

Posted April 20, 2014 - 07:06 PM

will today I got the governor set.  

that was after a half hour of trying

it went below 3600 rpm and tried again back up to 4300 rpms

keep trying until I got it close 

final rpm at 3450 

then I was going to test drive it

I first time working on a hydro

the neighbor set it to free wheel, so we could tow it 

so I had him show me what he done

he set it back and he drove it around

he was happy like a kid, it was just sitting in his shed for the last five years

 

he went home and mower a little bit

 and came back with a check for me and said that is the best it has ran in years

 

told him that I had to replace the head gasket, the key for the flywheel and a spark plug

 

I did clean up the oil and dust on it and it is looking great for a 95 stx38



#15 Trav1s ONLINE  

Trav1s

    Got points?

  • Senior Member
  • Member No: 5472
  • 2,603 Thanks
  • 3,750 posts
  • Location: Cedar Rapids, IA

Posted April 20, 2014 - 08:06 PM

Glad you got this one figured out!
  • lyall said thank you




Top