My A4 adventures
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Originally posted by Ando View PostI found this in my spare parts bin that came with the replacement A4 will it suffice?
I would urge (when you get the boat buck$) to get a proper strainer though.
Also, definitely replace those plastic hose barbs.-Jerry
'Lone Ranger'
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1978 RANGER 30
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My suggestion of a raw water strainer was instead of the external strainer. Rather than install the wimpy one you have on hand, maybe make a real project out of it and source a robust, high volume strainer (I like the Groco ARG strainers, mine is pictured) and install it as part of a thru-hull replacement* at the next haul out.
Do it right, cry once.
Your pictured engine intake thru-hull looks factory original to me and if it is, I'd be shocked if it were 3/4" (pipe size). Catalina typically used 1/2" thru-hulls for their A4 engine intakes, mine was and its inside diameter is ridiculously small for a locale with marine growth. Remember, the outside diameter for 1/2" pipe size physically measures 7/8". Also, 1/2" thru-hulls are too small to be able to get bottom paint inside.
Check out this web page for an excellent treatment on what I'm talking about:
*My experience is Catalina used engine intake thru-hulls with an integral external grate requiring complete thru-hull replacement to get rid of it. Some builders fitted separate grates over the thru-hull, not Catalina.Last edited by ndutton; 08-06-2020, 01:15 AM.Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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Whoa?!?
Roadnsky, that’s quite a pic. Thank you. I did shove a rebar down the thru-hull and, though I didn’t leave the valve open for too long, the rate of flow seemed to be really good (if I left it, I could envision the rate of about 17gallons a minute as Ken I think mentioned in another thread).
But I haven’t look down the thru-hull with my own eye and so I will have that pic engrained in my brain until I do...thx again.
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Originally posted by ndutton View PostMy suggestion of a raw water strainer was instead of the external strainer.
I’ll also double check that thru-hull diameter.
Originally posted by ndutton View PostCheck out this web page for an excellent treatment on what I'm talking about:
https://pbase.com/mainecruising/external_strainers
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Originally posted by ndutton View Post
Just a quick note:
A few years ago, Maine Sail changed his domain name from https://pbase.com/mainecruising/boat_projects to https://marinehowto.com/. The old domain is still up for now, but I don't think any new material is being added to it.@(^.^)@ Ed
1977 Pearson P-323 "Dolce Vita"
with rebuilt Atomic-4
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Originally posted by edwardc View PostJust a quick note:
A few years ago, Maine Sail changed his domain name from https://pbase.com/ to https://marinehowto.com/. The old domain is still up for now, but I don't think any new material is being added to it.Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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When I got my boat it had a groco strainer like Neal pictured above. The hose barbs (1/2 inch NPT) were made to accept either 5/8 ID or 1/2 ID hose. The ID of the barb just fits a 1/4 inch drill bit. So for the first 22 years my Atomic Four was cooled thru a 1/4 diameter hole. I had never seen a fitting like this.
Hopefully the barb is pictured below.
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Ok quick question: the temp sender is the one in green, correct? If so, it’s not working. That’s why I put the wire on the one in red. Now the temp gauge is reading a steady 150 at 15 min of idle. What is the sender in red for again? Are they interchangeable? Where do I get a replacement sender for the one in green? Do these senders go out after awhile or is there something I can do to have the green one give me readings again (ie salvage it)?
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It would appear that you actually have TWO different senders from that pic.
The one circled in RED looks like the sender for the EWDS system
(see my first pic) or the Cole-Hersee
My 2nd pic shows a typical gauge sender like the green circled one in your pic.
If you're getting a 150° reading now then you may be fine.
What temp readings were you getting from the other one?
Note that the reading from the "Green" location will likely give you a higher temp than the "Red" location just after the Thermostat. YMMVLast edited by roadnsky; 08-10-2020, 09:28 PM.-Jerry
'Lone Ranger'
sigpic
1978 RANGER 30
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Originally posted by roadnsky View PostIt would appear that you actually have TWO different senders from that pic.
The one circled in RED looks like the sender for the EWDS system
(see my first pic) or the Cole-Hersee
My 2nd pic shows a typical gauge sender like the green circled one in your pic.
If you're getting a 150° reading now then you may be fine.
What temp readings were you getting from the other one?
Note that the reading from the "Green" location will likely give you a higher temp than the "Red" location just after the Thermostat. YMMV
The temp readings were 160-180, so I went through the entire cooling system to check for any blockages and I think I resolved the overheating but I don’t now know for sure bc now the sending unit isn’t sending any signals to the gauge now for some reason. That’s what made me take the wire from it and placed it on the EWDS sender (as a test to see if the gauge was faulty or the se ding unit).
So is this sending unit repairable? Or should I just buy a new one and, if so, which one should I get please?
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Originally posted by Ando View PostI don’t now know for sure bc now the sending unit isn’t sending any signals to the gauge now for some reason.
So is this sending unit repairable? Or should I just buy a new one and, if so, which one should I get please?
Take a resistance measurement engine cold and another when the engine is fully warmed up and see what the reistance change is, if any. The measurement is between ground and the central post of the sending unit with the wire disconnected.
Usually the sending unit and gauges need to be from the same manufacturer. Some are interchangeable. If you know the brand of the gauge maybe someone will be able to tell you which sending unit to buy.
ex TRUE GRIT
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