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4 Hp Briggs Snapper Push Mower

briggs snapper

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#1 Trav1s ONLINE  

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Posted August 12, 2014 - 05:21 PM

I need some help with a 30 year old Snapper push mower with a 4HP Briggs motor.  It was working fine then it stopped when the owner pushed it up a slight incline under a shrub.  It stalled and would not restart for her.  Owner added new plug, checked the oil, and the usual - all checks out.  I have messed with a bit and this is what I have discovered about it:

  • Spark is good
  • Will not run on carb cleaner thru the carb or plug hole
  • Repeatedly backfires thru the carb
  • If you pour gas into the carb and try to start it the gas will spray out of the carb

 

Based on all of this I am thinking that the intake valve is sticking open.  Any other thoughts or suggestions before I pull the shroud and head??



#2 Bill 76 ONLINE  

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Posted August 12, 2014 - 06:09 PM

Did she hit anything under the scrub that maybe sheared the flywheel key,That could throw it out of time.

Just a thought

Also check for compression that would tell you if the intake is stuck open


Edited by Bill 76, August 12, 2014 - 06:15 PM.

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#3 trowel OFFLINE  

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Posted August 12, 2014 - 07:26 PM

Did she hit anything under the scrub that maybe sheared the flywheel key,That could throw it out of time.

Just a thought

Also check for compression that would tell you if the intake is stuck open

I was about the type that, sounds like it.



#4 crittersf1 OFFLINE  

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Posted August 13, 2014 - 07:34 AM

I did that and hit a root. Twisted the crankshaft.



#5 Trav1s ONLINE  

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Posted August 13, 2014 - 09:02 AM

Ok, I will pull the shroud and check the key.  I am also going to pull the head while it is apart.



#6 Trav1s ONLINE  

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Posted August 13, 2014 - 08:54 PM

Pulled the shroud off of the Snapper tonight.  It seems I need a special puller to remove the flywheel on this one.  Any suggestions on how to get this one off short of buying a puller?  My auto gear puller will not work on this one.



#7 LilysDad ONLINE  

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Posted August 14, 2014 - 06:51 AM

Do you have an impact wrench? If you stick a big screw driver through the fins on the flywheel, your almost certain to break off the fins!



#8 Trav1s ONLINE  

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Posted August 14, 2014 - 04:27 PM

My hunch was right - the intake valve was stuck open

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Edited by Trav1s, August 14, 2014 - 04:30 PM.


#9 Trav1s ONLINE  

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Posted August 14, 2014 - 04:32 PM

So the next question is this:  If I get the valve seat to reseat in the block will it stay?  

 

I noticed that the head gasket was leaking around the valve and there was much carbon on the head.  Do I part it/scrap it or play around with it?  



#10 LilysDad ONLINE  

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Posted August 14, 2014 - 06:03 PM

If it were me, I might try using a punch and hammer to peen the seat in place. Other than a new head gasket, I wouldn't spend much money on it.



#11 Bill 76 ONLINE  

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Posted August 14, 2014 - 06:41 PM

If it were me, I might try using a punch and hammer to peen the seat in place. Other than a new head gasket, I wouldn't spend much money on it.

:iagree: Peen it place and have the owner use it for a trade in on a new mower,I don't think it has much time left on earth.



#12 Trav1s ONLINE  

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Posted August 14, 2014 - 07:30 PM

Well, I used a punch to tap it into place.  I told her it is beyond help and she is selling the house at the end of the month so she does not need a mower at her new place.  I think I will part it out and salvage what I can. It is a very nice mower and it has electric start.  



#13 LilysDad ONLINE  

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Posted August 14, 2014 - 09:15 PM

You should be able to find another B&S engine.



#14 Trav1s ONLINE  

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Posted August 15, 2014 - 07:00 AM

The model is 21405ps and I will do some digging for options.  



#15 Trav1s ONLINE  

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Posted August 15, 2014 - 08:45 AM

Here is another pic of the machine.

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