Jump to content

Garden Tractors and Parts on eBay



Photo
- - - - -

One Last Try


  • Please log in to reply
23 replies to this topic

#1 bbuckler OFFLINE  

bbuckler
  • Senior Member
  • Member No: 59269
  • 2,844 Thanks
  • 2,517 posts
  • Location: Killeen,Tx

Posted December 12, 2016 - 12:11 AM

Cast iron briggs decrease rpm down real low under a load and then raise up real high in neutral. 

The valves are off at 0.10 and I need to take it to a machine shop but still I don't know if that is the problem. 

The carb as been rebuilt twice and leaks no matter what and I swapped the points out for nova II module. 

If I can't figure it out it getting repowered or parted 

 



#2 stiemmy OFFLINE  

stiemmy
  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 53712
  • 2,452 Thanks
  • 1,796 posts
  • Location: Freekin cold central WI

Posted December 12, 2016 - 12:17 AM

Good engine, but maybe reread you're own posting, .010, that maybe ur problem?

Briggs are tough SOB, they will run in the worst conditons.

Engines WANT TO RUN, just have to give them several good conditions!

Good blue spark, adequate compression, air, and fuel is all u need!:)

Edited by stiemmy, December 12, 2016 - 12:26 AM.

  • boyscout862 and bbuckler have said thanks

#3 MH81 ONLINE  

MH81

    Proud to be Deplorable

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 802
  • 29,905 Thanks
  • 29,735 posts
  • Location: N. W. PA

Posted December 12, 2016 - 12:21 AM

Stare at the manual and verify the gov linkage is ok.
  • boyscout862, LilysDad and bbuckler have said thanks

#4 bbuckler OFFLINE  

bbuckler
  • Senior Member
  • Member No: 59269
  • 2,844 Thanks
  • 2,517 posts
  • Location: Killeen,Tx

Posted December 12, 2016 - 12:28 AM

I got to take it to the machine shop to get the valve seats grounded down ?



#5 bbuckler OFFLINE  

bbuckler
  • Senior Member
  • Member No: 59269
  • 2,844 Thanks
  • 2,517 posts
  • Location: Killeen,Tx

Posted December 12, 2016 - 12:32 AM

Stare at the manual and verify the gov linkage is ok.

Seems fine I went over that manual several times. I never had a engine give me this much trouble 



#6 boyscout862 ONLINE  

boyscout862
  • Senior Member
  • Member No: 8923
  • 11,430 Thanks
  • 8,462 posts
  • Location: N.E. Connecticut

Posted December 12, 2016 - 12:46 AM

I got to take it to the machine shop to get the valve seats grounded down ?
[/quote

Try lapping the valves first. I just slowly grind the stem to adjust lash. Good Luck, Rick



#7 bbuckler OFFLINE  

bbuckler
  • Senior Member
  • Member No: 59269
  • 2,844 Thanks
  • 2,517 posts
  • Location: Killeen,Tx

Posted December 12, 2016 - 12:47 AM

I got to take it to the machine shop to get the valve seats grounded down ?
[/quote

Try lapping the valves first. I just slowly grind the stem to adjust lash. Good Luck, Rick

tried won't go down no more
  • boyscout862 said thank you

#8 classic ONLINE  

classic
  • Senior Member
  • Member No: 52970
  • 4,666 Thanks
  • 2,060 posts
  • Location: New York

Posted December 12, 2016 - 12:48 AM

I wouldn't just have the valve seats cut to close the valve lash. You only want to cut the seats enough to clean them up and narrow the seat. Replacing the exhaust valve seat may be necessary, but you might be able to just have yours cut or ground. It would be best to pick up new valves and grind the valve stem tips to set the lash. In most cases, you will have to do a two angle valve job to narrow the seats. The two angles will be 31° and 46°. The valve face is cut at 45°. Valves can be found cheap on ebay. I can hear your valves tapping away, so the valve lash is excessive. Your cam lobes and tappets can be worn badly, also. To me, it seems like your governor is not working as it should. The governor parts need to be in good condition, and the governor needs to be adjusted perfectly to get the engine to perform.

Edited by classic, December 12, 2016 - 12:50 AM.

  • bbuckler said thank you

#9 Gtractor ONLINE  

Gtractor

    The Tractor Hoarder

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 782
  • 8,302 Thanks
  • 4,567 posts
  • Location: Chillicothe, MO

Posted December 12, 2016 - 01:16 AM

There could be as many as 3 things wrong there.

They are:

 

[1] The governor is not working. 

 

[2] The governor is not working.

 

[3] The governor is not working.


  • Rock farmer, WNYTractorTinkerer and bbuckler have said thanks

#10 bbuckler OFFLINE  

bbuckler
  • Senior Member
  • Member No: 59269
  • 2,844 Thanks
  • 2,517 posts
  • Location: Killeen,Tx

Posted December 12, 2016 - 07:15 AM

I wouldn't just have the valve seats cut to close the valve lash. You only want to cut the seats enough to clean them up and narrow the seat. Replacing the exhaust valve seat may be necessary, but you might be able to just have yours cut or ground. It would be best to pick up new valves and grind the valve stem tips to set the lash. In most cases, you will have to do a two angle valve job to narrow the seats. The two angles will be 31° and 46°. The valve face is cut at 45°. Valves can be found cheap on ebay. I can hear your valves tapping away, so the valve lash is excessive. Your cam lobes and tappets can be worn badly, also. To me, it seems like your governor is not working as it should. The governor parts need to be in good condition, and the governor needs to be adjusted perfectly to get the engine to perform.

I think one of the valves are NLA but I probably can find it. I will pull the oil pan today and check everything I will also get some pictures of the parts

#11 Bruce Dorsi OFFLINE  

Bruce Dorsi

    Old, but not dead -- yet!

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 1525
  • 3,819 Thanks
  • 2,411 posts
  • Location: New Jersey

Posted December 12, 2016 - 07:40 AM

Cast iron briggs

The valves are off at 0.10    .....but still I don't know if that is the problem. 

 

 

 

 

Refresh our memories, please.

 

What model B&S Cast-iron engine?  ....The valve clearances are different, depending on the engine model.

 

If your intake valve clearance is .010", that is slightly off, but should not affect running.

 

If your exhaust valve clearance is .010", that is far enough from spec to cause poor running.

 

Was the engine recently apart?  .....Valve timing?


Edited by Bruce Dorsi, December 12, 2016 - 07:45 AM.

  • MH81 said thank you

#12 ol' stonebreaker OFFLINE  

ol' stonebreaker
  • Validating
  • Member No: 12515
  • 1,684 Thanks
  • 1,148 posts
  • Location: idaho

Posted December 12, 2016 - 09:28 AM

  Sounds like incorrect governor linkage setting or internal governor problem.

                                            Mike



#13 bbuckler OFFLINE  

bbuckler
  • Senior Member
  • Member No: 59269
  • 2,844 Thanks
  • 2,517 posts
  • Location: Killeen,Tx

Posted December 12, 2016 - 09:57 AM

Refresh our memories, please.

 

What model B&S Cast-iron engine?  ....The valve clearances are different, depending on the engine model.

 

If your intake valve clearance is .010", that is slightly off, but should not affect running.

 

If your exhaust valve clearance is .010", that is far enough from spec to cause poor running.

 

Was the engine recently apart?  .....Valve timing?

Was rebuilt but I didn't pull the cam or crank.

325431 0139 01



#14 bbuckler OFFLINE  

bbuckler
  • Senior Member
  • Member No: 59269
  • 2,844 Thanks
  • 2,517 posts
  • Location: Killeen,Tx

Posted December 12, 2016 - 12:10 PM

I don't know if anyone can tell anything from these pictures.

Attached Thumbnails

  • 15416113_1290217867701881_153916969_n.jpg
  • 15416898_1290217787701889_2042397093_n.jpg
  • 15417029_1290217917701876_1043155225_n.jpg
  • 15423522_1290217834368551_1001246053_n.jpg
  • 15423778_1290217804368554_1649234362_n.jpg
  • 15424416_1290217951035206_707373266_n.jpg
  • 15451030_1290217981035203_1485123919_n.jpg
  • 15451237_1290217934368541_315784125_n.jpg
  • 15494133_1290217891035212_66744553_n.jpg
  • 15497786_1290217851035216_1576659003_n.jpg
  • 15415950_1290217824368552_1759213444_n.jpg


#15 EricFromPa OFFLINE  

EricFromPa

    Tractorholic

  • Senior Member
  • Contributor
  • Member No: 2135
  • 3,093 Thanks
  • 2,808 posts
  • Location: Bedford County Pa.

Posted December 12, 2016 - 02:14 PM

Cam lobes and lifters look a little worn but not bad.

 

If the Intake valve is not seating correctly it will cause the Carb to leak no matter how many times you rebuild it.

 

You need to lap your valves real good and check your clearances again.Model 320000 Briggs valve clearances should be (Intake .007-.009)  (Exhaust .017-.019)

 

I'm betting that after you lap your valves the intake valve will be rite in spec but you will have to grind a little off of the exhaust valve stem.

 

I had the same problem on my SS14.Carb would puke fuel all over the place until I lapped the valves.I had to grind my exhaust valve stem down almost .010.It's because over time the seat gets a little worn from the heat and the valve smashing down on it.The seat might have overheated a few times if it was run lean.

 

Do you have Both governor springs installed? They have a Hi Speed and Low speed governor spring.

 

Here's a couple good videos on the Governor and how they work and how to adjust it.

 

 

Here's how you set your Governor.

 

https://youtu.be/2IxRyfSvDY0?t=7m40s


Edited by EricFromPa, December 12, 2016 - 02:17 PM.

  • bbuckler said thank you




Top