Adding a tell tale water outlet 1964 Merc 850

I added one to a 9.8 just drill a hole for a 1/8 inch tap in the water jacket and just tap it far enough to get three good threads then put permatex on the threads pf a brass 90 degree nipple. I then added the pisser fitting through the lower cowl it worked put well. Just keep the drill bit coated in bearing grease to catch the shavings same with the tap.

Oh yea i put it on the top of the block center close to the cover.

And no need to regulate the water flow.

Jeff

Thanks very much for the replies, I really appreciate it.

I just picked up one of these 90-degree brass 1/8" NPT male-to-female fittings to use at the top of a 115hp block I built.

https://www.amazon.com/gp/product/B003U94022/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

It lets you run the hose out the side and keep a low profile, so it doesn't interfere with anything in the top hat.

Just pull that 1/8" plug at the top of the block and screw-in the brass fitting. Then pick up an appropriate straight male fitting with hose barb, screw into the brass fitting, and you're good.

You can also add a telltale discharge fitting at the Stbd lower rear of the cowling, it'll give you a nice stream and directs the flow away from the cowling.

OMC has a number of fittings that just snap into a drilled hole. Here's one used on many engines:

http://www.marineengine.com/newparts/part_details.php?pnum=OMC0321885

Or just run a 1/8" or 3/16" hose off the fitting, thru a small hole drilled in the lower cowling. That should give some restriction, to provide for a build-up of pressure, giving you a more energetic stream out the hose.

HTH...........ed

Thanks Ed, I'll try the same set up. Thanks again