Where to put RTV Silicone Sealer during water pump service?

J

Jamie Jackson

Cadet
Joined
Jan 27, 2012
Messages
6
1995 Mercury 9.9 HP Outboard

I have a question about the following schematics:
schematic.jpg
schematic2.jpg

Liquid Key:
7: Loctite 271
116: RTV 587 Silicone Sealer
87: High Performance Gear Lubricant
95: 2-4-C With Teflon

Where, exactly, does the RTV Sealant go? The schematic seems to show a "block" of it on the stern-side of the water pump base (18). If I knew what the point of it was, I'd have a better idea where to put it. The second schematic & instructions aren't terribly clear to me, either.

Thanks,
Jamie
 
B

brandon110

Seaman
Joined
Nov 20, 2010
Messages
55
Re: Where to put RTV Silicone Sealer during water pump service?

you have to put a bead between the waterpump housing and the exhaust cavity to keep exhaust from entering the waterpump.
 
A

aussieflash

Lieutenant Junior Grade
Joined
Feb 5, 2011
Messages
1,004
Re: Where to put RTV Silicone Sealer during water pump service?

Its a divider plate to shield from exhaust heat.Most slide into place,though some are fixed.I slide mine out,clean it and seal all the way around it.
 
J

Jamie Jackson

Cadet
Joined
Jan 27, 2012
Messages
6
Look to the mid-section mating surface.

Look to the mid-section mating surface.

Thanks guys.

Things make a bit more sense when I look at the mating surface of the engine's mid-section: I can see that the barrier between the water pump/drive shaft/shift linkage cavity and the exhaust cavity lands right on top of the stern "shelf" of the plastic water pump base. It looks like a bead of RTV sealant should go right there, where that shelf on the pump meets the barrier of the mid-section.
 
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