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John Deere Tractors Discussion Forum
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lead washers 46 B

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Ken Tabor

09-01-2005 18:11:27




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I have noticed a few places where bolts go through the engine case, where lead washers are used around the bolts. These appear to be to seal the threads? Are the lead washers necessary or could a thread sealant work as well?

Ken




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Terry Hahn

09-02-2005 17:44:54




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 Re: lead washers 46 B in reply to Ken Tabor, 09-01-2005 18:11:27  
My father used brass compression washers on the head bolts when we rebuilt teh engine on his G puller. He used these washer when he worked on compressors years ago. We have not had any problems with these washers. If you want to use them you might have to go to a hydraic shop to get teh washers. Also has added caution we used thread lock on all bolts and nuts. Hope this helps.



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Glen in TX

09-01-2005 21:54:46




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 Re: lead washers 46 B in reply to Ken Tabor, 09-01-2005 18:11:27  
I'm like Duane and like using the lead washers where JD calls for them on the old tractors. Usually a good reason why they used them and some places where they work better than other things. For example: Some 2 cylinders used a drilled bolt for safety wire and lead washers on the clutch dust shield that bolts to reduction gear cover. The lead washers give you some cushion while aligning the shield as the holes are oversized some to allow for alignment. Then when aligned and bolts are tightend the lead squeezes up the gap and holds the shield tight.

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Duane Larson

09-01-2005 20:06:53




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 Re: lead washers 46 B in reply to Ken Tabor, 09-01-2005 18:11:27  
Ken,
I believe the lead washers, used commonly under the nuts holding the head on, are used to help tighten the nuts uniformly and to reduce galling between the back of the nut and the head surface. The lead washers do not act as a thread sealant (they don't get between the nut and stud threads), nor do they act to prevent any fluid leakage past the nut as they do not fill up the hole around the stud. I use them because JD calls for them, and also use thread sealant (Loctite PST with Teflon) to prevent thread seepage.

Others will likely have other opinions.

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CMB

09-02-2005 08:12:43




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 Re: lead washers 46 B in reply to Duane Larson, 09-01-2005 20:06:53  
Duane, I agree that the lead washers act as a lubricant between the head & nuts, but I disagree that they don't act as a sealer between the studs & the head. Ever notice how hard it is to get a head to move when removing because the lead is packed so tightly between the threads & the holes in the head? Once many years ago, I accidently damaged a lead washer while installing the head on our '41 B, the next morning there was a LOT of water in the crankcase with the oil. A quick check showed coolant dripping from around one of the head bolts. Upon removing that nut the cause was very apparent--the lead washer was torn. A clean up & a replacement washer was all it took to fix it. I challenge you to install a head that uses lead washers without them & see how quickly the crankcase fills with water! This has been discussed many times over the years, and it seems that the JD engineers knew EXACTLY what they were doing when they required use of the lead washers, though I've often wondered if, in this day & age, there isn't some sort of plastic that would work as well or better.

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ebbsspeed

09-02-2005 07:06:48




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 Re: lead washers 46 B in reply to Duane Larson, 09-01-2005 20:06:53  
I believe that the ones under the head nuts serve as a lubricant, believe it or not, when torquing them. Definitely keeps the nuts from galling the cast iron head.



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