1614

[john raasch]

so I have my grand father's 1641 it was running as should one time next time it ran rough do to wire between coils melted i replaced coils and wire now tractor will not start I fuel ,spark, and a 180lbs of compression puzzled i would really appreciate any help i can get

 

[mfrade]

You can see the fuel going into the carb? Or you added fuel to the tank?
You verified the plugs actually sparked?
180 PSI of compression? THAT has me puzzled!! I think if that reading is accurate, then the cylinder is full of oil or gas.
If you indeed have gas going thru the carb, and you apply spark at the plug at the right time.. it'll run. Suck / Squish / Bang / Spit all at the right time is all it takes.

 

[Neil Mullins]

Yes 180 PSI is way above normal. In fact I’d question a starter being able to roll an engine over at that pressure.

 

[Neil Mullins]

general rule on small 4 cycle engines without auto compression release is in the 100 PSI neighborhood with engine cold.

 

[gary noblit]

John, you replaced coils,the gap from flywheel should be about .010. If you cranked it with plugs out,is it spitting any liquid?? As others have said the comp. number seems high which suggests there is liquid in cyl.....the wire between coils is a ground to kill engine ..Did you find why it burned?If it shorted in the harness it might still be keeping it from sparking...Unplug kill wire and test for spark.If you do have spark you have the answer,finding the short might not be easy. If you do have spark,do not try to start that way..You will no longer have a way to shut off engine unless you pull plug wires or can choke it out...

 

[john raasch]

I did check air gap according to the manual its 0.080 to 0.012 spark plug gap is .030 with brand new spark plugs cylinders not full of oil or gas but plugs do get wet and smell like gas it has me completely stumped it ran beautiful before wire melted between coils that ended up touching the head

 

[john raasch]

John, you replaced coils, the gap from flywheel should be about .010. If you cranked it with plugs out, is it spitting any liquid?? As others have said the comp. number seems high which suggests there is liquid in cyl.....the wire between coils is a ground to kill engine ..Did you find why it burned? If it shorted in the harness it might still be keeping it from sparking...Unplug kill wire and test for spark.If you do have spark you have the answer, finding the short might not be easy. If you do have spark, do not try to start that way. You will no longer have a way to shut off engine unless you pull plug wires or can choke it out...

also shorted out wire was completely replaced with new wire and connectors

 

[john raasch]

its also a 1995 cub caddet 1641

 

[gary noblit]

John, again..unplug kill wire from coils or side of engine to see if plugs spark by removing and grounding them if you don't have an inline spark tester.

 

[john raasch]

John, again..unplug kill wire from coils or side of engine to see if plugs spark by removing and grounding them if you don't have an inline spark tester.

I have spark testers both show steady strong spark

 

[gary noblit]

John, the only thing left I would do...unhook fuel and plug ,drain carb, plugs in and crank with a shot of carb.cleaner(not ether) with coil kills unhooked....it should fire...if it does track backwards to what was done and possible flooding of carb also be sure if it has a fuel sol. on carb. that it is working. If it does not fire you're losing spark somewhere...(Briggs almost always require choke on when cold) I use this method to test most engines for a few seconds of run time.....only takes 3 ,spark,fuel, and comp. to fire

 

[john raasch]

does the upper port on back of the carb connect to anything

John, the only thing left I would do...unhook fuel and plug ,drain carb, plugs in and crank with a shot of carb.cleaner(not ether) with coil kills unhooked....it should fire...if it does track backwards to what was done and possible flooding of carb also be sure if it has a fuel sol. on carb. that it is working. If it does not fire you're losing spark somewhere...(Briggs almost always require choke on when cold) I use this method to test most engines for a few seconds of run time.....only takes 3 ,spark,fuel, and comp. to fire

does the port on the back upper side of the carb connect to anything

 

[gary noblit]

does the upper port on back of the carb connect to anything

does the port on the back upper side of the carb connect to anything

John, not sure what port you mean...does it line up with hole in gasket?Is it a stock 16 hp Briggs?

 

[john raasch]

John, not sure what port you mean...does it line up with hole in gasket?Is it a stock 16 hp Briggs?

no it comes out the back of the carb and 90's to the drivers side it is also barbed and coming out the passenger side is some electric sensor

 

[lpalma]

I believe that it is a carb bowl overflow,is the clear hose still there.?

 

[gary noblit]

John, it might be best to send a pic.of carb...is it 16 hp briggs vanguard, I looked up that carb and don't see what you are explaining...

 

[mgonitzke]

If it has spark, compression and is getting gas, it should start, unless the timing is off. Did the flywheel key shear?

 

[lpalma]

Here is one off a 1641, pretty sue it is an overflow for the carb bowl. the hose exits out the bottom of the engine mounting plate by the firewall.

 

[john raasch]

I believe that it is a carb bowl overflow,is the clear hose still there.?

no hose

 

[john raasch]

If it has spark, compression and is getting gas, it should start, unless the timing is off. Did the flywheel key shear?

no but just noticed light say to disengage pto was lite but pto is turned off