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John Deere Tractors Discussion Forum
Show Parts for Model:

john deere 70 loud engine noise

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grandad..

04-10-2014 19:08:39
66.87.145.98



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Got a 70 gas and it has a terrible loud squeel and grinding noise which sounds like it's on clutch side. Took clutch off and housing. Looks ok in there. Started it without clutch and same loud noise. It is not a hammer sound it is just a grind squeel sound. Seems to lug engine and loosen up. Crank has very little end play and a little play up and down. Can a bad main bearing cause that much noise. Absolutely sounds great when turning it over by hand or with starter. No noise what so ever. But once it starts look out. Help please

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Wilamayb

04-11-2014 18:20:06
66.168.152.76



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 Re: john deere 70 loud engine noise in reply to grandad.., 04-10-2014 19:08:39  
Yup, I make a motion to disengage the hydraulic pump and live PTO if it is so equipped and fire it back up to see what happens.



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resting relics 1

04-11-2014 05:36:34
96.39.76.38



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 Re: john deere 70 loud engine noise in reply to grandad.., 04-10-2014 19:08:39  
Grandad, With no clutch in the tractor you've eliminated all of the possible transmission noises. It's either in the PTO driveline somewhere or the engine itself. It's possible the hydraulic pump drive or the pump itself I suppose. Can't remember if you can disconnect the pump like A's and 60's but if you can try that. Otherwise I guess you'll have to pull the crankcase cover and take a look at the rod bearings. They usually rumble or pound when they fail rather than squeal but I guess it could. Good Luck! John

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grandad..

04-11-2014 05:51:27
207.250.121.230



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 Re: john deere 70 loud engine noise in reply to resting relics 1, 04-11-2014 05:36:34  
I have the reduction housing off. What is all involved in checking that main bearing on that side. Can I just pull that cast housing off and check the bearing. Also whats the easiest way to pull that inside gear off the crank?? Thanks in advance



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Blksmok

04-11-2014 10:24:04
67.209.80.17



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 Re: john deere 70 loud engine noise in reply to grandad.., 04-11-2014 05:51:27  
granddad...check the rod bearings first. Much easier than checking the mains. I assume this a gas model? You can check the rod bearings through the top crankcase cover. If your has a center main bearing, you need to pull that out with the crankshaft. If the engine runs ok cold at idle and starts to labor as it warms up...bearings.



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ET

04-11-2014 06:44:05
134.179.104.127



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 Re: john deere 70 loud engine noise in reply to grandad.., 04-11-2014 05:51:27  
Pull the crankcase cover off and look for a broken oil line to the main bearing behind the clutch. Look for any broken oil lines in there.



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tractotnutjd

04-10-2014 19:37:49
74.79.128.196



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 Re: john deere 70 loud engine noise in reply to grandad.., 04-10-2014 19:08:39  
Try shutting off the main pto disconnect and see if the noise goes away



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Blksmok

04-10-2014 19:23:59
67.209.80.17



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 Re: john deere 70 loud engine noise in reply to grandad.., 04-10-2014 19:08:39  
grandad...My guess, spun rod bearing. Expensive fix.



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grandad..

04-14-2014 12:40:32
207.250.121.230



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 Re: john deere 70 loud engine noise in reply to Blksmok, 04-10-2014 19:23:59  
Yup she had a bad rod bearing. Now looking for a crank and rod. Anybody have something laying around



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grandad..

04-10-2014 19:30:32
66.87.145.84



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 Re: john deere 70 loud engine noise in reply to Blksmok, 04-10-2014 19:23:59  
When I rock the crank back and forth there is no free play in the rods though?



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JRSutton

04-11-2014 04:01:41
71.174.108.245



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 Re: john deere 70 loud engine noise in reply to grandad.., 04-10-2014 19:30:32  
You won't always feel looseness with a bad bearing. sometimes they spin, gall up a bit, and stay tight.



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