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Farmall & IHC Tractors Discussion Forum
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986 engine noise...i'm stumped

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thepinkpanther

06-05-2007 18:19:36




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i bought a 986 last week.we changed the oil and i sent the boy to go mow hay with it today while i baled at another farm.he called me and said it was making a thumping noise.i told him check it out and call back.he called later and said it had gotten worse and was coming from the air cleaner housing.he said he put his hand up to the air cleaner inlet pipe and said that everytime it thumped it puffed air out.

is it a intake valve thats bad? i really cant spare the tractor now,thats why i bought it.any ideas?

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Carl R

06-06-2007 05:18:36




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 Re: 986 engine noise...i'm stumped in reply to thepinkpanther, 06-05-2007 18:19:36  
I have seen where the bottom of the lifter wore through allowing the push rod to fall and ride on the cam lobe.
This caused the push rod to get free of the exhaust rocker arm but it was still getting an intake charge and firing that cylinder.
The exhaust rocker was still getting hit by the push rod so some exhaust was escaping that way.
When the intake valve opened it the rest of the exhaust escaped through it first causing the small thumping sound if I remember correctly.

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Steven@AZ

06-05-2007 20:25:15




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 Re: 986 engine noise...i'm stumped in reply to thepinkpanther, 06-05-2007 18:19:36  
We had a rocker arm break on our 1086 several years back... pull valve cover first.



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the tractor vet

06-05-2007 19:07:56




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 Re: 986 engine noise...i'm stumped in reply to thepinkpanther, 06-05-2007 18:19:36  
Now on a non turboed tractor you can hear some thumpen from the ft. while it is working thru the air cleaner but it is not that loud. like KB said pull the valve cover ya may find a broken rocker or a broken rocker shaft or some pushrod broken on and intake also it could be that the cam has a lobe or two comming off it as this has in the past been somewhat of a problem. And if this is the case you will have to pull the head along with the ft, cover to replace.

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K.B.-826

06-05-2007 18:53:01




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 Re: 986 engine noise...i'm stumped in reply to thepinkpanther, 06-05-2007 18:19:36  
Sounds like valvetrain issues. I'd start out by removing the valve cover and having a look.



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