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Riser Draining Winterizing

"All,
I have 1988 twin 5.7&#3


"All,
I have 1988 twin 5.7's fresh water cooled, the type with the thru hull & seawater pump on the motor, not the outdrive. The manual talks about draining the risers. One problem, my risers do not have any drain holes like illustrated in the shop manual? The prevous owner when I purchased the boat told me the risers were replaced with Mercruiser stainless risers. I did not know these even existed. Shouldn't they still have drains? I disconnected the raw water hose from the thru hull and ran the pink stuff through till it came out the transome. Do you think I am safe?"
 
"That's about all you can

"That's about all you can do, other than drilling and tapping for plugs!

Congrats on doing it right.

Jeff"
 
"check close for brass plugs,

"check close for brass plugs, maybe painted over. Not all have petcocks but most have some type of plug."
 
"Boy, it is tempting to replac

"Boy, it is tempting to replace all the drain plugs with petcocks! But the rust that drains out when a plug is removed prevents me from doing that. I can see the rust plugging up the petcock.

I'll get the socket wrench out instead.

Jeff"
 
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