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Capt T
#1 Posted : Friday, July 16, 2010 9:38:19 AM(UTC)
Capt T

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Think Going diving under the old girl tomorrow looking for the capoc sending unit. Not sure what I am looking for. Does any body have a picture of it? also if by chance it got painted over how do I clean it off? Ive head no abrasives or chemicals
1978 Aft Cabin
Twin Chrysler 440's
Fox Road Marina

My Father once told me "if you ever need a helping hand, just look to the end of your arm!"
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jralbert
#2 Posted : Friday, July 16, 2010 9:44:19 AM(UTC)
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T: the capacs were generally mounted forward. Mine is starboard and aft of water intake. It's 10" round, fairly thin profile...but center area, the delicate part, is about 3" dia. I would not use anything other than a regular soft (not aggressive) sponge to clear that inner circle. It's made of very thin silv/silver chloride metal.
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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pfhlaw
#3 Posted : Friday, July 16, 2010 9:47:34 AM(UTC)
pfhlaw

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You can use a soft brush to remove marine growth.
Here's a picture:
File Attachment(s):
Capac Sensor2.jpg (504kb) downloaded 52 time(s).
Peter
1981 32' sedan bridge
twin Chrysler 360 cu. in. 250 hp engines
Raw water cooled
Nimbus II
Home port: New Buffalo, MI
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Capt T
#4 Posted : Friday, July 16, 2010 9:51:17 AM(UTC)
Capt T

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Applause Thanks for the fast response guy's and the pics Peter. Great help.
1978 Aft Cabin
Twin Chrysler 440's
Fox Road Marina

My Father once told me "if you ever need a helping hand, just look to the end of your arm!"
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Capt T
#5 Posted : Saturday, July 17, 2010 1:09:43 PM(UTC)
Capt T

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Well thanks to your response's we found the Capac units under our boats today while diving. Everything looks great clean and shiny silverThink . According to the picture you sent peter they should be a bronze color. bottoms of both boats clean. One of them is a 37 sedan and mine the 37 aft cabin both readings are .06 at the dock and away from the dock. sedan has zincs on keel, rudders and trim tabs. Mine only has zincs on the keel. we noticed the keel zincs were 1/4" thick, is that okay or should they be thicker'er? I know I need some zinc's for my rudders and tabs they'll be ordered on Monday. It still doesn't explain the low readings on both boats.
I am trying to figure out this isolation of the shafts and rudders. Would someone explain in kindergarten terms, how to check these and what to look for. Thanks a whole bunch
1978 Aft Cabin
Twin Chrysler 440's
Fox Road Marina

My Father once told me "if you ever need a helping hand, just look to the end of your arm!"
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Capt T
#6 Posted : Saturday, July 17, 2010 1:12:04 PM(UTC)
Capt T

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I'll be checking the meters tomorrow to make sure they are working correctly and did I understand correctly that if the galvanic isolator unit is not warm than it is not working properly?
1978 Aft Cabin
Twin Chrysler 440's
Fox Road Marina

My Father once told me "if you ever need a helping hand, just look to the end of your arm!"
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Barkleydave
#7 Posted : Sunday, July 18, 2010 1:18:08 AM(UTC)
Barkleydave

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Here is a simple way to check isolation. (It is also on a metal plate on many Big M's)

1. Make up a jumper cable with clips on each end.

2. Check your Capac reading. example: .90

3. Connect jumper to shaft coupler on the shaft side

4. Connect other end of jumper to hull or engine block etc.

5. Check readin again. If shaft was isolated the reading will deflect downward. Example: .60

Shaft isolated = Reading deflects with shaft is grounded to hull
Shaft Not isolated= Reading remains the same does not deflect.

dave

None
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