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Have a 19.5 hp" Deere" OHV &S Model # 31P6 770144 83

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Have a 19.5 hp "John...
Have a 19.5 hp "John Deere" OHV B&S Model # ***** 770144 83 replacement engine in a Craftsman lawn tractor 3000. At end of season (Nov.) in midst of "stop and start" job engine tried to turn over but couldn't restart. Big-engine Cat mechanic son-in-law did valve job and checked battery, fuel line etc. but is flummoxed. Why would it just stop running smoothly after several years and regular maintenance?
Submitted: 2 years ago.Category: Small Engine
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Answered in 3 minutes by:
2/3/2016
Technician: Donald, Small Engine Technician replied 2 years ago
Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2,480
Experience: I have 25+ years of experience repairing 2 & 4 cycle engines
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Hello, and thank you for choosing Just Answer. My name is***** will be happy to assist you. Will your engine start up and run briefly, if you spray a small burst of carburetor cleaner, directly into your carburetor?

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Customer reply replied 2 years ago
No
Technician: Donald, Small Engine Technician replied 2 years ago

This will leads me to believe that our problem could be ignition related. Have you checked for spark?

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Customer reply replied 2 years ago
I believe my son-in-law did
Customer reply replied 2 years ago
He's not here. Can you give some "mechanic"-level suggestions to pass on to him?
Customer reply replied 2 years ago
Hello anyone there?
Technician: Donald, Small Engine Technician replied 2 years ago

Keep in mind that an engine needs three things in order to start up and run. Fuel, Spark, and Compression. If your engine will not start, after you spray carburetor cleaner into your carburetor, then this leaves Spark and Compression to question.

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Technician: Donald, Small Engine Technician replied 2 years ago

Have your son to confirm spark first. Do you know what valve settings he used?

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Customer reply replied 2 years ago
I'm sure he used the ones in the manualm - he's a pro. .004
Customer reply replied 2 years ago
that's "manual"
Technician: Donald, Small Engine Technician replied 2 years ago

Ok. Have you tried a new spark plug?

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Customer reply replied 2 years ago
He checked that
Technician: Donald, Small Engine Technician replied 2 years ago

Ok. Did he say if he noticed spark to your spark plug, when he was checking it?

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Technician: Donald, Small Engine Technician replied 2 years ago

These are only troubleshooting questions.

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Customer reply replied 2 years ago
Don't know
Technician: Donald, Small Engine Technician replied 2 years ago

I would for you to get your son to confirm two things for me. Then you and I will have a good starting point, to continue from.

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Customer reply replied 2 years ago
Ok. Shoot.
Technician: Donald, Small Engine Technician replied 2 years ago

Ask him about the spark, and ask him if he allowed his piston to go 1/4" past Top Dead Center, before adjusting your valves.

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Customer reply replied 2 years ago
Will do and get back to you. Prefer this way. How do I get back?
Technician: Donald, Small Engine Technician replied 2 years ago

Thanks! You will get a link in your email, that links you directly back to me.

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Customer reply replied 2 years ago
Roger - over and out.
Technician: Donald, Small Engine Technician replied 2 years ago

10-4 ...

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Customer reply replied 2 years ago
Had a bit of a hiccup here with other events as priorities. Son-in-law can confirm spark but wants to check his valve adjustment in case he was further around than 1/4. Back to you in two days.
Technician: Donald, Small Engine Technician replied 2 years ago

This will be fine. Thanks for letting me know.

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Customer reply replied 2 years ago
Hello Donald. Finally son-in-law (Christian) has re-done valve job and I just had the battery checked at Sears. Battery is good. When we try to start without spark plug engine turns over easily. With spark plug not even once around and battery is drained. Where to we go from here?
Technician: Donald, Small Engine Technician replied 2 years ago

Thanks for letting me know.

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Technician: Donald, Small Engine Technician replied 2 years ago

If your battery is good, and you are 100% sure your valves are properly adjusted, then this leaves two very good possibilities. Either your starter is bad, or the compression release mechanism on your cam gear has failed.

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Customer reply replied 2 years ago
Christian not here to ask tech q's. Any way to tell whether its starter or compression release?
Customer reply replied 2 years ago
Just talked w/ C, he asked if there is a way to test the compression release mechanism?
Technician: Donald, Small Engine Technician replied 2 years ago

You will need to either swap starters with another mower, that you know is working properly, or get someone to test your starter for you. If your starter is good, then it is very likely that your cam gear will need to be replaced.

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Customer reply replied 2 years ago
Is that $$$ and difficult?
Technician: Donald, Small Engine Technician replied 2 years ago

A new cam gear can cost of to $100.00

You will need to remove your engine from your mower in order to do it. It is not too difficult.

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Technician: Donald, Small Engine Technician replied 2 years ago
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Technician: Donald, Small Engine Technician replied 2 years ago
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Technician: Donald, Small Engine Technician replied 2 years ago

I attached a link to two videos that will give you an idea of what has to be done, when replacing your cam gear.

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Customer reply replied 2 years ago
Thanks.. I will get back to you in a day.
Technician: Donald, Small Engine Technician replied 2 years ago

You are very welcome! I am not aware of a way to accurately check your compression release. Usually if your starter and battery is good, and your valves are properly adjusted, you can rest assured that your compression release is bad, if our problem still exists.

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Customer reply replied 2 years ago
Finally back to you Donald. Small engine repair person informs me that I have a broken shaft and should replace the short block. He's looking but no luck yet. Can I find an inexpensive one online? Or should I get a new engine/tractor unit?
Technician: Donald, Small Engine Technician replied 2 years ago

Is your mechanic referring to your crankshaft, or cam shaft?

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