engine/pump shimming questions

[Woody]

needed to find this so i'm subscribing, although this is an old thread.

 

[McDog]

me too good find

 

[augustaf]

Got a question on this.....................If you shim the gap, doesnt that impair the ability of the seal to compress to the hull? If you shim the contact area, that would allow even seal compression around the diameter of the seal.

Got a new hull I am fighting right now with this issue...........needed .100" on the rear of the pump, but the ds is perfect in the hole. Wonder if shimming the front would have the same result, but change the pump angle?

You usually need .010" or maybe .020" (if any at all) for your midshaft housing. That still gives you some seal compression. If in doubt goup up the sealing area with RTV. - .100" at the pump is unusual but can be done if needed, don't shim the front! Besides visually centering the drive shaft in the hole, make sure the mid housing does not force the shaft up or down when lined up with the mounting holes. That's more important than the shaft visually looking good. Now get ready for snow.