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Miss in the 870


 
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JHH
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Joined: 30 Mar 1999
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PostPosted: Thu Nov 15, 2012 3:57 pm    Post subject: Miss in the 870 Reply to specific post Reply with quote

We got a miss in the 870.
About 1600 hrs. on a complete overhaul. About 100 hrs. ago she started what sounded like an exhaust valve leak that you would hear when you shut it down. Removed valve covers and found one valve with little clearance, adjusted and worked okay. Now it started missing on a cylinder when it is worked hard for a while, if you throttle it back it stops missing after a bit. Pulled valve covers again to check lash and one exhaust valve is at .010 cold. Any clues as to what is going on here?
 
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Agri King
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PostPosted: Thu Nov 15, 2012 4:15 pm    Post subject: Re: Miss in the 870 Reply to specific post Reply with quote

The valve seat is loose and getting pushed up into the head.
 
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John Saeli
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PostPosted: Fri Nov 16, 2012 5:50 am    Post subject: Re: Miss in the 870 Reply to specific post Reply with quote

Or, the spring is so relaxed that the valve is floating when revved up. I'd pull that head & investigate before you break what is left of a pounded valve or seat & do internal damage.
 
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JHH
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PostPosted: Fri Nov 16, 2012 10:03 am    Post subject: Re: Miss in the 870 Reply to specific post Reply with quote

Pulled heads on the 870. Looks like there was a soft exhaust valve seat in number 3 hole, recessed obout .065.
Number 3 exhaust valve


Number 4 exhaust valve


 
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John Saeli
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PostPosted: Sat Nov 17, 2012 9:51 am    Post subject: Re: Miss in the 870 Reply to specific post Reply with quote

Dirt will do that. 870's used 2 different Air Filters, some had the short, some had the long. Make sure you don't have a short filter stuck in a housing meant for the long element. Good luck.
 
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JHH
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PostPosted: Sat Nov 17, 2012 3:11 pm    Post subject: Re: Miss in the 870 Reply to specific post Reply with quote

John Saeli wrote:
(quoted from post at 13:51:19 11/17/12) Dirt will do that. 870's used 2 different Air Filters, some had the short, some had the long. Make sure you don't have a short filter stuck in a housing meant for the long element. Good luck.

Good observation, funny thing is if it was dirt it all went into the one hole. This 870 has a turbo and a 970 air filter.
 
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