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John Deere Tractors Discussion Forum
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Washers on headbolts

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AWB

12-17-2006 16:51:36




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Are washers (Lead or otherwise) supposed to be used on the cylinder head bolts on a John Deere LA? None are shown in the parts book. Thanks.




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F-I-T

12-17-2006 21:38:18




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 Re: Washers on headbolts in reply to AWB, 12-17-2006 16:51:36  
The lead washers were used on the horizontal Waterloo-built engines for a couple of reasons. The primary purpose was that any lead that was trapped between the stud shank and the head surface and seat side of the nut, would be pressed down and around the stud forming an additional seal to prevent any coolant from moving up the stud and into the crankcase oil. Secondarily, the lead serves as a lubricant to allow for a more consistent torque application when seating the nuts. Since the "L" engine head used cap screws, and the heads of the screws were on the outside, any oil or coolant weeping up that far indicated a more severe problem, so sealing it wasn't the priority. Actually, being able to see any seepage as it occurred was an easy way to tell that head gasket problems might be on the horizon. Also, there was not a very wide shoulder on the raised boss on the head, so not much area for the lead to press against.

It's a very similar design to a flat head head Ford -N engine or even a Farmall Cub, which just use the cap screw shoulder seating against the boss for sealing.

Frank

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James2

12-17-2006 21:14:40




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 Re: Washers on headbolts in reply to AWB, 12-17-2006 16:51:36  
Not a LA expert by any means, but I'm sure they wouldn't be lead. Lead washers would just squeeze out when you torqued the bolts. More likely lead washers could be on the valve cover bolts.



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