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Kohler L600 water pump, copper washers?

Kenny Crenshaw

I am putting my L600 back together, and the 4 water pump bolts had copper washers on them rather than steel lock washers. At first I thought maybe the threads went into the water jacket, but no, they are all blind. The parts list does not even show the bolts, much less the washers. Is there a reason there are copper washers under the bolt heads, or should I use regular lock washers?