the clutch (SHOCK ABSORBER) spring will sometimes break causing it to strech enough to cause rub marks on the underside of the water pump and as was my case….. caused all sorts of headhaches cloosing up the LU . it repeatedly failed pressure testing until i realized the problem.
I had my friend tack weld the thing at 6″11/16 on 3 spots around and made certain the welds did not protude …we simply polish them up with a grindrer.
The cluch is removed by removing the water pump layers and simply pulled out. With theshock absorb capabilities gone I used a 3/16 brass rod to cut me some brass drive pins.
5.5 OMC Shock Absorber Removal
it is pictured in the 
red book in the CD section of the LU pages
Joining AOMCI has priviledges 🙂