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John Deere Tractors Discussion Forum
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70 -- knock revisited

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Roy Prins

11-23-2012 16:28:16

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well we took the flywheel off and really didnt see anything out of the ordinary -- put it back on after a good cleaning with a good dose of red locktight-- how tight should the big nut be before cranking on the 2 clamping bolts? i had it toooo tight and it wouldnt turn over so i backed it up a bit then cranked on the 2 new fine threaded bolts-- 170 lbs torque on the clamping bolts with a little oil on them -- we thought we would let it set till monday before cranking it up to see if it still knocks -- note one question in this message and tell me what ya think! thanks for the help so far-- Roys Toys

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Roy Prins

11-24-2012 16:50:41

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 Re: 70 -- knock revisited in reply to Roy Prins, 11-23-2012 16:28:16  
by telling you people what we might do sure does put some peoples shorts in a bunch---LOL thanks for all the advice but putting someone down for their lack of experience is not a nice way to share your knowledge with others -- we are all in this together so be nice

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11-24-2012 17:04:32

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 Re: 70 -- knock revisited in reply to Roy Prins, 11-24-2012 16:50:41  
In all life's endevers." Looking before you leap" saves much time, money and grief. 1-800-522-7448 for the service manual. There is a handy PDF from the late great Dwayne Larson of all the two cylinder service manuals. A must have .

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Mike Aylward

11-24-2012 05:01:53

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 Re: 70 -- knock revisited in reply to Roy Prins, 11-23-2012 16:28:16  
As the others have said the big tin nut is for setting the endplay ONLY. If you used loctite on the crankshaft and flywheel it's a lead pipe cinch the flywheel will come loose. You want the crank and flywheel clean and with solid, metal to metal contact. Get that thing off and clean it up. Mike

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11-24-2012 04:29:29

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 Re: 70 -- knock revisited in reply to Roy Prins, 11-23-2012 16:28:16  
My G had a knock last year. I tried the flywheel, then the clutch driver. I had just overhauled it a few years earlier so I knew the pistons, wrist pins, bore job, and head, were all up to snuff. Ended up being a rod bearing. Had the crank turned and she's fine now. I learned there a lots of possible causes for a knock, ha. Seems to me, I heard the saying before that if you tighten up only the top end of an engine, the bottom end will go out quicker. That would make sense on my tractor. Wonder if your 70's crank was ever turned?

Your post brought back bad memories! Good luck.

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rusty wheel

11-23-2012 19:54:01

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 Re: 70 -- knock revisited in reply to Roy Prins, 11-23-2012 16:28:16  
Why would you put it back together if you hadn
't found the problem? The knock could be a wrist pin or a rod bearing. Did you check the up and down movement of the crankshaft?

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11-23-2012 17:44:56

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 Re: 70 -- knock revisited in reply to Roy Prins, 11-23-2012 16:28:16  
I think you need to read your I&T manual understand it and start over before you really mess things up if you have not already.

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11-23-2012 17:18:59

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 Re: 70 -- knock revisited in reply to Roy Prins, 11-23-2012 16:28:16  
Well, the big nut is for setting the crankshaft end play only. But if the locktite has set up then its probably too late now. The two bolts with nuts are for tightening the flywheel to the crank.

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Bob Harvey

11-23-2012 18:51:53

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 Re: 70 -- knock revisited in reply to greenday, 11-23-2012 17:18:59  
Locktite is just a temporary 'glue', it is NOT permanent. That is the point of it, Use it , it will ensure the bolt/nut will not move under normal circumstances. Put a wrench on a 'Loctited' item, and it may take a slightly larger effort to 'break it loose', but it is NOT permanent. HTH

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Bob Harvey

11-23-2012 16:40:14

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 Re: 70 -- knock revisited in reply to Roy Prins, 11-23-2012 16:28:16  
All I can say is: adding oil to the equation changes the ACTUAL torque reading- way too complicated for me to describe , but had the theory back in the day (also I am not sure other than that it has been addressed here before). HTH

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Rich Duane

11-24-2012 05:08:38

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 Re: 70 -- knock revisited in reply to Bob Harvey, 11-23-2012 16:40:14  
Roy, The torque spec for the bolts is 275#

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11-24-2012 14:58:44

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 Re: 70 -- knock revisited in reply to Rich Duane, 11-24-2012 05:08:38  
No it isn't 275 with the soft factory bolts these guys didn't know enough to replace.275 with new grade 5's or 8's. Until they quit trying to patch it on the cheap and without a service manual. The "fixes" won't work. They didn't even know anything about end play. Hope they don't ruin the tractor.

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