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Ed&Sherry 
Silver Level
Joined: 08 May 2010
Location: Owego, NY
Points: 234
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 Topic: engine problem
Posted: 13 May 2018 at 9:38am |
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wrong color ,,,JD8400,,plowing ,engine bangs and stoped,,,,last night pulled the valve cover and found one broken rocker arm, one bent push rod,,but the rockers are all real loose to the point you can remove all of the rods by hand,,the rocker arm ass. is tight and not broke....what happened??? broke cam gear?could the cam slide forward? thanks
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 51553
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Posted: 13 May 2018 at 11:13am |
 Ed&Sherry wrote:
wrong color ,,,JD8400,,plowing ,engine bangs and stoped,,,,last night pulled the valve cover and found one broken rocker arm, one bent push rod,,but the rockers are all real loose to the point you can remove all of the rods by hand,,the rocker arm ass. is tight and not broke....what happened??? broke cam gear?could the cam slide forward? thanks |
I know they can slide, if the cam is busted... 
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DrAllis
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Joined: 12 Sep 2009
Points: 20398
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Posted: 13 May 2018 at 12:50pm |
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If the engine is locked up? ... you'll figure it out when you tear it apart.
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AC7060IL
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Joined: 19 Aug 2012
Location: central IL
Points: 3335
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Posted: 13 May 2018 at 1:39pm |
You may want to check the 8400's transmission for a fault which it's 8.1L engine may have absorbed the transmission's stopping forces?? https://www.redpowermagazine.com/forums/topic/7759-a-john-deere-that-ate-itself-for-lunch/?page=2
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MACK
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Joined: 17 Nov 2009
Points: 7664
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Posted: 13 May 2018 at 9:48pm |
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I would say cam shaft is broke for some reason. Most common reason is when it throws a rod, it usually gets the cam. MACK
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Ed&Sherry
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Joined: 08 May 2010
Location: Owego, NY
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Posted: 20 May 2018 at 9:59am |
broke cam,1 lobe off crank,,1 sleeve bottom broke , crack in block other wise good to go 
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22818
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Posted: 20 May 2018 at 8:40pm |
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My neighbor bought a slightly used JD8110 a few years back. Didn't get 200 hours out of it and the engine puked. Scoured piston on one cylinder. He did a little internet checking, and found it was a common problem on that engine, but JD never fessed up to the problem.
They told him some ridicules price to put one piston and sleeve in, but couldn't guarantee the others would hold up. I think it was 14K to get it back in working order with new sleeves and pistons.
I have run it a lot, and it's pretty handy for light tillage work, but lacks higher field speeds , just can't figure why JD would let that engine go with known problems in them.
Edited by CTuckerNWIL - 20 May 2018 at 8:40pm
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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
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Posted: 22 May 2018 at 9:40am |
CTuckerNWIL wrote:
My neighbor bought a slightly used JD8110 a few years back. Didn't get 200 hours out of it and the engine puked. Scoured piston on one cylinder. He did a little internet checking, and found it was a common problem on that engine, but JD never fessed up to the problem.
They told him some ridicules price to put one piston and sleeve in, but couldn't guarantee the others would hold up. I think it was 14K to get it back in working order with new sleeves and pistons.
I have run it a lot, and it's pretty handy for light tillage work, but lacks higher field speeds , just can't figure why JD would let that engine go with known problems in them.
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It's like GM's oil burning and their ultra low tension piston rings. Same with Ford on the 6.7 Diesel. The valves and stems are too thin to survive long term heavy usage. Their other problem is they didn't put a downstream injector in the exhaust to regen the DPF like GM did. The oil gets fuel contaminated and they spin bearings.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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