How do you tighten the seawater pump

[92rslt1]

I have a 88 7.4 and I took the seawater pump off and inspected it and put it back on and I noticed the belt is really loose. How do I go about tightening the belt? There is no pulley or idler, it hooks straight to the balancer pulley.

 

[Bt Doctur]

Re: How do you tighten the seawater pump

If you look at the mounting bracket you will see the slotted area.