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Briggs Wont Start

#1

J

JonnyBlaze

Hello. So some if you know I swapped over guts from one block to another because of a broken connecting rod. New headgasket. Had to adjust valves because of no compression. Now have compression but its doing this. It was actually doing this before I adjusted valves as well.

Its a 19.5hp in a D110 John Deere.

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October 31, 2021

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#2

M

mechanic mark

Fresh gas, oil level on full mark, clean air filter, compression & spark, do you have a spark tester?
Remove battery & take to auto parts store & ask them to load test battery, should be of no cost to you.


#3

J

JonnyBlaze

mechanic mark said:
Fresh gas, oil level on full mark, clean air filter, compression & spark, do you have a spark tester?
Click to expand...
Yes to all. Im reffering to how it stops turning over a few revolutions.


#4

PTmowerMech

PTmowerMech

JonnyBlaze said:
Yes to all. Im reffering to how it stops turning over a few revolutions.
Click to expand...

Take the choke off, spray some carb cleaner through the carb and see what happens. If it cranks, then you have a fuel problem. Maybe the carb.
First, Make sure the fuel solenoid isn't staying shut. (It's plugged in, right?)

If it doesn't crank, then you may have a timing problem. As in maybe you didn't get the cam dot lined up with the crank gear dot.


#5

J

JonnyBlaze

PTmowerMech said:
Take the choke off, spray some carb cleaner through the carb and see what happens. If it cranks, then you have a fuel problem. Maybe the carb.
First, Make sure the fuel solenoid isn't staying shut. (It's plugged in, right?)

If it doesn't crank, then you may have a timing problem. As in maybe you didn't get the cam dot lined up with the crank gear dot.
Click to expand...
I got the dots lined up for sure. Doesnt change when spraying fluid in carb and I hear the fuel solenoid clicking.


#6

PTmowerMech

PTmowerMech

JonnyBlaze said:
I got the dots lined up for sure. Doesnt change when spraying fluid in carb and I hear the fuel solenoid clicking.
Click to expand...

Ok, so you have fuel (Carb spray), and you got the time marks lined up. And you have compression. Then the only thing left is spark. Or no spark. Did you gap the coil correctly?

If you don't have spark, remove the engine cover, unplug the coil kill wire, then give it a shot of carb cleaner again. If it cranks, then you probably have safety switch gone bad.

FACT

Fuel
Air
Compression.
Timed spark


#7

J

JonnyBlaze

Could it be that I might not have one of the valves adjusted correctly?


#8

Scrubcadet10

Scrubcadet10

Just GUESSING,
valves for that intek, should be adjusted between .003" and .005" intake, and .005-.007 Exhaust.
Post the model number of the JD engine and donor engine.


#9

J

JonnyBlaze

I just double checked valves. Replaced coil and carb and still does it. Only coughs with choke on like its doing in video. Wont fire off starting fluid either. Just coughs out carb.


#10

R

Rivets

When swapping parts, mainly internal, did you make sure that all were exactly the same? If you used the old cam, but changed the crank, was the rod journal in the same location? Used new crank, but old flywheel, was the flywheel key location in the exact same place? Were the cam lobes in the same place? If any of these are off by a degree it will create problems, especially if more than one is different. Can’t tell this by eyesight, but must compare engine model and type numbers, then if the part numbers are the same, even pistons and rings should be checked.


#11

J

JonnyBlaze

Rivets said:
When swapping parts, mainly internal, did you make sure that all were exactly the same? If you used the old cam, but changed the crank, was the rod journal in the same location? Used new crank, but old flywheel, was the flywheel key location in the exact same place? Were the cam lobes in the same place? If any of these are off by a degree it will create problems, especially if more than one is different. Can’t tell this by eyesight, but must compare engine model and type numbers, then if the part numbers are the same, even pistons and rings should be checked.
Click to expand...
I used all the internals from same motor as well as the head and flywheel.

The block that had good internals had a broken off headbolt and I didn't want to mess with trying to extract it. It ran but headgasket was blown and bolt broken on me when I attempted to remove head

Should I use old original head and flywheel?


#12

R

Rivets

Head shouldn’t matter, but I would either keep the flywheel and crank together or at least make sure that the key way and magnets on the flywheel match. Did you swap the valves? Even if you didn’t, I hope you took the time to recut faces and seats, plus lap them in, and reset valve clearance, while you had it apart.


#13

Scrubcadet10

Scrubcadet10

Scrubcadet10 said:
Post the model number of the JD engine and donor engine.
Click to expand...


#14

J

JonnyBlaze

Rivets said:
Head shouldn’t matter, but I would either keep the flywheel and crank together or at least make sure that the key way and magnets on the flywheel match. Did you swap the valves? Even if you didn’t, I hope you took the time to recut faces and seats, plus lap them in, and reset valve clearance, while you had it apart.
Click to expand...
It was the flywheel! I put old one back on and it fired right up! Had to adjust governor cause it was racing a little bit but seems all good now. Thanks!


#15

R

Rivets

Glad you got it going, as this was a common mistake my students would make when rebuilding engines in class. Just like electrical troubleshooting, never assume anything until you have double checked it three times. Now go back and double check every bolt and screw you can find and oil level. I’ll bet you’ll find at least one a little loose.


#16

J

JonnyBlaze

Rivets said:
Glad you got it going, as this was a common mistake my students would make when rebuilding engines in class. Just like electrical troubleshooting, never assume anything until you have double checked it three times. Now go back and double check every bolt and screw you can find and oil level. I’ll bet you’ll find at least one a little loose.
Click to expand...
Will do!


#17

PTmowerMech

PTmowerMech

JonnyBlaze said:
It was the flywheel! I put old one back on and it fired right up! Had to adjust governor cause it was racing a little bit but seems all good now. Thanks!
Click to expand...

Congrats man. Isn't it an awesome feeling to know it's just a simple fix. Even though it doesn't seem like it.

Was the magnets in a different location?


#18

J

JonnyBlaze

PTmowerMech said:
Congrats man. Isn't it an awesome feeling to know it's just a simple fix. Even though it doesn't seem like it.

Was the magnets in a different location?
Click to expand...
I didn't take a close look but I think they were smaller and closer together? They were definitely different. Its a relief for sure.


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