Bondar Posted December 11, 2015 Report Share Posted December 11, 2015 I will be attempting to change the upper crank shaft seal tomorrow on my 1999 Mercury 50hp 4 stroke. Anything I should look out for? Seems fairly straight forward. Just looking for someone who may have done this before Thanks Link to comment Share on other sites More sharing options...
mike rousseau Posted December 11, 2015 Report Share Posted December 11, 2015 (edited) The seals under you water impeller? In your lower unit? Edited December 11, 2015 by Mike Rousseau Link to comment Share on other sites More sharing options...
Bondar Posted December 12, 2015 Author Report Share Posted December 12, 2015 (edited) ... Edited December 12, 2015 by Bondar Link to comment Share on other sites More sharing options...
hirk Posted December 12, 2015 Report Share Posted December 12, 2015 Before you touch it find a service manual online. I can tell you merc 2.5 litre blocks require you to split the block halves and possibly pull the pistons/rods for that repair. Link to comment Share on other sites More sharing options...
Bondar Posted December 14, 2015 Author Report Share Posted December 14, 2015 Thanks Hirk, it ended up being another issue all fixed up now Link to comment Share on other sites More sharing options...
tomkat Posted December 16, 2015 Report Share Posted December 16, 2015 Glad to hear you got it fixed Link to comment Share on other sites More sharing options...
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