Telltale for 165 Mercruiser

malrv1

Cadet
Joined
Jun 23, 2018
Messages
19
Hi I have 165 Mercruiser with a heat exchange system. I am paranoid about running the impeller dry. Could I run a telltale jet like an outboard by tapping into the raw water system with a small 1/8th or 1/16th line running to somewhere I can see?
 

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
No reason you can't, but unless you're going to be watching the telltale (and not where you're going :eek:) the whole time, you're better off setting up a pressure switch and alarm system.
 

QBhoy

Fleet Admiral
Joined
Mar 10, 2016
Messages
8,286
Apologies for the slander...but don’t these have their own permanent tell tale ?....oh no wait....that’s just the water pump seal, head and cooling water leaking. Sorry couldn’t resist. Forgive me.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,468
Hi I have 165 Mercruiser with a heat exchange system. I am paranoid about running the impeller dry. Could I run a telltale jet like an outboard by tapping into the raw water system with a small 1/8th or 1/16th line running to somewhere I can see?

Ayuh,...... Find a water pressure gauge used for an outboard in a speed boat,......

Glancin' at a gauge is better than starrin' at a tell tail stream,.....
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,306
a $20 water pressure gauge used on an outboard, plumbed to the hose just after the raw water pump would work. however simply changing the impeller regularly while doing all the other annual maintenance is the best way to prevent issues.
 
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