HD11B engine help

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Long time reader, first post here. 
I have a HD11B, serial #4483 that I took home a month ago. I ran it for a few hours and everything worked well. No leaks, fires right up, and everything works.

Now that I had some faith in the machine, I moved it into the shop for a complete fluid/filter change.

After I changed the engine oil and filter I pulled out the fuel shut off and wound the engine over until I saw 20 psi of oil pressure. I pushed in the fuel shut off, let it idle and it maintained 40 psi of oil pressure at idle.

Here is when things went south on me. I had it running to clear the air in the fuel lines and check for leaks. All of a sudden I heard a knock in the motor. Shut it down, pulled the valve covers and everything looked fine. Engine knock is still there when winding over and fuel shut off pulled out. This eliminates the fuel system or stuck injector.

Anything common or simple to look into before I tear into the engine? I will pull the belts off the accessories just in case the noise is up front.

 I find it hard to believe that it can go from Hero to Zero in a matter of minutes. Rotella 15W40 oil with a WIX filter. 

Any input would be great! Thanks.

Edited by mulligan - 22 Jun 2019 at 7:18am

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mulligan Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 23 May 2019 Location: Eastern Canada Points: 3	Post Options Post Reply Quote mulligan Report Post Thanks(0) Quote Reply Topic: HD11B engine help Posted: 22 Jun 2019 at 7:16am
	Long time reader, first post here. I have a HD11B, serial #4483 that I took home a month ago. I ran it for a few hours and everything worked well. No leaks, fires right up, and everything works. Now that I had some faith in the machine, I moved it into the shop for a complete fluid/filter change. After I changed the engine oil and filter I pulled out the fuel shut off and wound the engine over until I saw 20 psi of oil pressure. I pushed in the fuel shut off, let it idle and it maintained 40 psi of oil pressure at idle. Here is when things went south on me. I had it running to clear the air in the fuel lines and check for leaks. All of a sudden I heard a knock in the motor. Shut it down, pulled the valve covers and everything looked fine. Engine knock is still there when winding over and fuel shut off pulled out. This eliminates the fuel system or stuck injector. Anything common or simple to look into before I tear into the engine? I will pull the belts off the accessories just in case the noise is up front. I find it hard to believe that it can go from Hero to Zero in a matter of minutes. Rotella 15W40 oil with a WIX filter. Any input would be great! Thanks. Edited by mulligan - 22 Jun 2019 at 7:18am

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Mactractor Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 20 Jun 2011 Location: New Zealand Points: 652	Post Options Post Reply Quote Mactractor Report Post Thanks(0) Quote Reply Posted: 24 Jun 2019 at 1:09am
	My Buda powered HD6 did the same, and have not performed any surgery to find out why. Tractor is just parked in rotten row. Hope the lack of replies here doesnt mean everyone with Buda powered crawlers are in this same situation! Check driveshaft to hydraulic pump if it has front mounted pump, to make sure shaft has not come apart, hitting bottom of radiator. The noise created is similar to engine knock. Edited by Mactractor - 24 Jun 2019 at 1:16am

Ian Beale Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 03 Oct 2011 Location: New South Wales Points: 992	Post Options Post Reply Quote Ian Beale Report Post Thanks(0) Quote Reply Posted: 24 Jun 2019 at 1:34am
	Probably not a lifeline but the Buda in our AC Fortyfive seems ok. It ran a couple of days ago.

mulligan Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 23 May 2019 Location: Eastern Canada Points: 3	Post Options Post Reply Quote mulligan Report Post Thanks(0) Quote Reply Posted: 28 Jun 2019 at 7:00am
	Thanks for the replies. After I verified that I didn't have anything making contact with any moving parts, I let it idle again and after a few seconds the noise went away. Still a little baffled with what happened.

DMiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 14 Sep 2009 Location: Hermann, Mo Points: 33263	Post Options Post Reply Quote DMiller Report Post Thanks(0) Quote Reply Posted: 28 Jun 2019 at 9:04am
	I suspect you are hearing something Converter related, may be just age and nothing to worry of where changing oils it finally passed the excess air.