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  #1   IP: 98.171.180.82
Old 04-11-2017, 07:38 PM
jt007 jt007 is offline
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Thermostat Replacement Part number?

The previous owner of my 1979 Catalina 30 replaced the stock thermostat with the CSTH_03.4_241 Thermostat spacer kit (http://www.moyermarine.com/cgi-bin/s...=CSTH_03.4_241).

This thermostat is no longer found on the Moyer website and the single action thermostat does not fit my system (Product No. - CSTH_01_510).

Any suggestions on aftermarket kits or replacement thermostats?


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  #2   IP: 24.152.132.65
Old 04-12-2017, 08:16 AM
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Welcome 007
Is your engine raw or fresh water cooled? Where I'm heading is if raw water cooled the very best thing you can do for the engine is convert to fresh water cooling for both operating temperature and internal rust prevention. There are some of us, myself included (1977 Catalina 30), who run with no thermostat (also requires a bypass shutoff valve) at the recommended temperature of 180° all day long.

You can manage temperature manually with no thermostat via the bypass valve. You could also spring for a complete new thermostat conversion kit with parts that fit together. Then there's the chance you can find an original 3 spring Holley dual action thermostat on the used parts market. They come up on ebay once it a while. Come to think of it I might even have one that I'll never use again. I'll get to the boat and check in the next couple of days and get back to you.
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prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others

Last edited by ndutton; 04-12-2017 at 08:20 AM.
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  #3   IP: 98.171.180.82
Old 04-12-2017, 09:27 AM
jt007 jt007 is offline
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The engine is raw water cooled. I'll look into fwc systems and consider running without a thermostat. I do have the bypass valve already.

After a late night searching, I determined that what I need initially is a new 1/4" spacer to place on the new thermostat (after removing the old spacer).

Any suggestions on fwc systems? I'll check the previous threads.
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  #4   IP: 137.200.32.38
Old 04-12-2017, 09:32 AM
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The Indigo thermostat will fit any A4 engine, FYI.
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  #5   IP: 24.152.132.65
Old 04-12-2017, 09:40 AM
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Quote:
Originally Posted by jt007 View Post
Any suggestions on fwc systems? I'll check the previous threads.
Some of us buy the kit, others assemble our own from parts resourced elsewhere. The Catalina 30 is a bit of a special case with zero clearance in front of the flywheel for a pulley and belt to drive the second pump. Options for us are the Indigo kit driven off the accessory drive or the electric coolant pump (that was my choice). Last weekend I did 10 hours of motoring towing a 14' Zodiac, no thermostat and electric coolant pump. All good.
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1977 Catalina 30
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prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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Old 04-12-2017, 10:48 AM
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Another welcome JT!

Before diving into the change to FWC discussion, is this the 140 old style you're looking for? It's $164 -ouch.

http://www.moyermarine.com/cgi-bin/s...y=CSTH_07_60.1

I guess I'm at a loss to understand why the 1/4 spacer won't allow you to use the standard thermostat.

http://www.moyermarine.com/cgi-bin/s...ey=CSTH_01_510

The trick is to know that the new thermostat itself has no bypass function - it simply opens and closes. The spacer goes on top of the thermostat, the housing on top of that, and the movable part of the thermostat goes into the block.

Given the lack of real bypass function, you can also just make the housing fit the thermostat (no spacer required). Countersink in brass, or take a die grinder to it. Doesn't take much - less than 1/4" right in the middle.

http://www.moyermarine.com/forums/al...pictureid=1711

EDIT: You still need the bypass valve in this configuration to provide some water to the exhaust during warm up, and some back pressure when warm to preferentially force water through the block. This is the Great Compromise of the late model thermostats set up as stock.
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Last edited by BunnyPlanet169; 04-12-2017 at 11:23 AM.
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  #7   IP: 98.171.180.82
Old 04-12-2017, 10:50 PM
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Thanks for the replies. I'll look into the suggestions. I think a rebuild is in the cards next year and I'll tackle the fwc then.
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Old 04-13-2017, 09:54 AM
JOHN COOKSON JOHN COOKSON is online now
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Quote:
Originally Posted by jt007 View Post
The engine is raw water cooled. I'll look into fwc systems and consider running without a thermostat. I do have the bypass valve already.
.
What temperature were you running at with the current thermostat set up? I don't remember seeing in the thread. Depending on the running temp with the current thermostat set up, you might be happy running without a thermostat until you do the FWC conversion.

TRUE GRIT
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Old 04-14-2017, 12:00 AM
jt007 jt007 is offline
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I was at 140 before. I've been running the engine without a thermostat while in the slip in neutral. I have not succeeded in getting the water temp gauge to register anything. I'll give it another trial run next time I motor out of the Harbor.
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Old 04-14-2017, 08:58 AM
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Quote:
Originally Posted by jt007 View Post
I was at 140 before. I've been running the engine without a thermostat while in the slip in neutral. I have not succeeded in getting the water temp gauge to register anything. I'll give it another trial run next time I motor out of the Harbor.
Depending on a few variables (local raw water temp, efficiency of flow through the engine, bypass valve position) it isn't surprising that you can't make the gauge move at idle without a thermostat.

That's actually a good thing, as it shows there probably aren't any issues with flow.
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  #11   IP: 24.152.132.65
Old 04-15-2017, 07:59 PM
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007, it turns out I do have a 3 spring Holley thermostat available. Let me know if you're interested.
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1977 Catalina 30
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prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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