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Old 03-17-2013, 01:58 AM   post #1 of 87
yellowcat
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Default Briggs and stratton 15.5HP IC- Valves not opening

Picked up a Yardman mower with a 15.5 Briggs on it today at a estate sale for $100. The guy said it would not start. I took it home and sure enough it will not start after adding fresh gas and making sure it was getting fire. I then took the OHV valve cover off and turned the engine over a few times. I discover the valves are not moving at all. Any idea on what might be broken or something come loose inside the crank case?









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Old 03-17-2013, 07:21 AM   post #2 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

I would take the head off, and see if the rod is bent. They could just need lubrication if the mower was sitting. Are they stuck open, or closed?

Could be a lot of carbon build up. Sometimes you can tap them free, by applying lubrication after each tap.I would still take the head off, and give it a good cleaning, and see whats going on.

What's the model/type/code?... Look on valve cover near the flange, vertical shaft it will be facing up on valve cover. Example would be 31C707-0230E1 040521ZF Keep us posted.
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Last edited by Boodaddy; 03-17-2013 at 07:27 AM.
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Old 03-17-2013, 08:40 AM   post #3 of 87
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Default Briggs and stratton 15.5HP IC- Valves not opening

Are the push rods still attached? If so and the valves are not stuck then likely you have a broken cam or gear. Does the piston even move up and down?


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Old 03-17-2013, 10:10 AM   post #4 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

Could be as bad as a broken rod that took out the cam...

or as simple as bad push rods that have fallen off (never seen it, but..)

Pull out the plug and crank it over...does air blow out?
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Old 03-17-2013, 10:14 AM   post #5 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

i agree with red. pull head off and go from there. i seen push rods snap. i seen cam shafts snap in 2. and i also seen rods take out the cam. also start looking at the block to see if you see any cracks.
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Old 03-17-2013, 01:32 PM   post #6 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

I just took out the plug and put my finger there..seems to be blowing out quite a bit of pressure. Wish I didn't lose my compression tester, The valves moves freely as I pull and push valve rockers and opens and closes fine. Plenty of oil coated also on those areas so not dry or stuck....also no carbon to speak of . If it was a rod the piston not be getting pressure out the plug hole..right? With this engine is it possible to take it off the deck frame and just take off bottom sump to get to camshaft with out taking all other components off like flywheel etc?


By the way is this camshaft having a nylon gear like some or is it steel? Push rods all there but they kinda seem loose and not tight putting pressure up on the rockers...is this not normal?

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Old 03-17-2013, 01:34 PM   post #7 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

it could have burnt the lobes off the cam. did you check the push rods?
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1971 ss14 (repower) 14hp cast iron briggs from a gilson
1972 ss15 (redone suburban 15) 78 cast iron 16hp
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1978 39inch sears 3pt tiller 8hp briggs
1991 mtd gt1846 rough beater for mowing grass lol
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Old 03-17-2013, 01:41 PM   post #8 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

The Model of this Briggs is- MODEL 31A607 TYPE 0458B1 CODE- 070411ZE
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Old 03-17-2013, 01:43 PM   post #9 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

pull the rockers off take out the pushrods and take pictures. i want to see the pushrods.
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1992 GMC Sonoma Extended cab
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1970 lawn flite (mtd)
1971 ss14 (repower) 14hp cast iron briggs from a gilson
1972 ss15 (redone suburban 15) 78 cast iron 16hp
1973 st10 (8hp briggs repower)
1978 39inch sears 3pt tiller 8hp briggs
1991 mtd gt1846 rough beater for mowing grass lol
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Old 03-17-2013, 03:33 PM   post #10 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

Quote:
Originally Posted by craftsmanmowerfreak View Post
pull the rockers off take out the pushrods and take pictures. i want to see the pushrods.


I took out the plug and looked in the at the piston...it moves back and forth when turning the engine.












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Old 03-17-2013, 03:36 PM   post #11 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

k they are fine hmmm its got to be something with the cam.
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1992 GMC Sonoma Extended cab
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my mowers
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1970 lawn flite (mtd)
1971 ss14 (repower) 14hp cast iron briggs from a gilson
1972 ss15 (redone suburban 15) 78 cast iron 16hp
1973 st10 (8hp briggs repower)
1978 39inch sears 3pt tiller 8hp briggs
1991 mtd gt1846 rough beater for mowing grass lol
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Old 03-17-2013, 03:40 PM   post #12 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

pull the engine pull the cam out and inspect it. theres 2 styles cames they put in these. one a solid gear cam and 2 a spoke kind. i am betting either cam broke or it burnt the lobes. both styles have steel gears.
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1992 GMC Sonoma Extended cab
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my mowers
1966 custom 6
1970 lawn flite (mtd)
1971 ss14 (repower) 14hp cast iron briggs from a gilson
1972 ss15 (redone suburban 15) 78 cast iron 16hp
1973 st10 (8hp briggs repower)
1978 39inch sears 3pt tiller 8hp briggs
1991 mtd gt1846 rough beater for mowing grass lol
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Old 03-17-2013, 03:46 PM   post #13 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

correction 3 kinds 3rd one has a peice at the bottom of stem for operating the oil pump
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1992 GMC Sonoma Extended cab
4.3l v6 700r4 trans
my mowers
1966 custom 6
1970 lawn flite (mtd)
1971 ss14 (repower) 14hp cast iron briggs from a gilson
1972 ss15 (redone suburban 15) 78 cast iron 16hp
1973 st10 (8hp briggs repower)
1978 39inch sears 3pt tiller 8hp briggs
1991 mtd gt1846 rough beater for mowing grass lol
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Old 03-17-2013, 07:51 PM   post #14 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

Finally got the engine off the mower frame and set it up on a table. Draining the oil now and looking into the oil drain hole I see pieces of metal...too big to pull out the hole. I am now going to wait until all the oil drains dry and remove sump cover. Wish me luck nothing major that will cost $500 or a new engine.
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Old 03-17-2013, 07:58 PM   post #15 of 87
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Default Re: Briggs and stratton 15.5HP IC- Valves not opening

Quote:
Originally Posted by craftsmanmowerfreak View Post
it could have burnt the lobes off the cam. did you check the push rods?
Sounds like a camshaft issue to me as well after seeing the rods. I agree something with the lobes, shaft, or gear. Shoot us some pics inside.
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