LM 318 140 thermosts

Trowerpower
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LM 318 140 thermosts

Postby Trowerpower » Thu Jun 27, 2019 10:13 am

Anybody have a source for chrysler marine thermosts?
Trower Power
1987 32ft Marinette Sedan Flybridge
Blue Sky
twin 392 Chrysler Stroker Motors
Performance Distributors
750 Edlebrocks
fresh water cooled
1.5 to 1 velva-drives
Onan 6.5kw gen set

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bcassedy
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Re: LM 318 140 thermosts

Postby bcassedy » Thu Jun 27, 2019 10:40 am

NAPA I get mine from there. Before replacing, I make sure they really are bad...
- put in pot on stove
- heat water to 130 deg (use a Harbor Freight infrared tester)
- raise water temp to 140 deg (or in the neighborhood) and watch that the copper pellet / spring system reacts (would equate to opening when t-stat's installed.
- if it opens, it's good - reuse
- if it doesn't open, or opens when the water temp's too high, replace.

Bill
Bill & Sharon Cassedy
"Sunset Seeker"
'88 32' Sedan Bridge
Located in Aurora, In.
Twin 318cu in Chrysler
1.5:1 Velvet drive trannies
Fresh water only

GregM
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Re: LM 318 140 thermosts

Postby GregM » Mon Jul 01, 2019 6:24 pm

I went with these 160 degree fail safes after loosing an engine due to a thermostat failing closed. I can watch the temp go from 160 to 180 then back down to 160.

https://www.amazon.com/gp/product/B000C ... UTF8&psc=1

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Re: LM 318 140 thermosts

Postby Fastjeff » Wed Jul 03, 2019 5:45 am

Temp will shoot up after a motor, that has been working hard, suddenly shuts off.

A case in point: Running my old Merc OB the other day when a ground strap fell off. (Stupid mechanic!) Motor was at full song when that happened, and the temp shot up to 240 ' F. Normally runs about 120.

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington

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Busia
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Re: LM 318 140 thermosts

Postby Busia » Wed Jul 03, 2019 12:58 pm

Fire him !
BUSIA
located in Ketchikan, Alaska. Gods country
32 foot Marinette express. (no fly bridge)
twin 350 Crusader (Chev 350) engines
1:1 Borg Warner velvet drive transmissions
Closed cooling (antifreeze in the engine)
Proud to be retired IBEW

javalin390
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Re: LM 318 140 thermosts

Postby javalin390 » Wed Jul 03, 2019 7:04 pm

I don't know if I would recommend a 160 thermostat on a raw water application. In a closed system, just like on a car, the radiator cap puts 10-15 psi on the system, thus raising the boiling point. Raw cooling has no pressure on the system, so hot spots in the block and heads will boil the water, bubbles aerate the coolant passages, and the destruction begins.
Jim Elias
1974 37' SedanFlybridge
Twin 360 Chryslers.
Marblehead, Ohio

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Re: LM 318 140 thermosts

Postby jralbert » Wed Jul 03, 2019 8:40 pm

The recommended Tstat for raw water is 140°
-joel-
former owner 1988 '32 FB Sedan
Chesapeake Bay
twin 318 / 240 hp
Potomac MD

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tundrarules
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Re: LM 318 140 thermosts

Postby tundrarules » Wed Jul 03, 2019 8:47 pm

1985 29 Sedan
Edelbrock 1409 carbs
Mallory distributors
Pertronix Flame-Thrower coil & wires
780 hrs/eng
TN River, MM 213.8

:mrgreen:

SunbeamIV
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Re: LM 318 140 thermosts

Postby SunbeamIV » Thu Jul 04, 2019 3:33 pm

Scott, 32' 1989 sedan flybridge
Located: Edgewater Yacht Club
Lake Erie

Trowerpower
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Re: LM 318 140 thermosts

Postby Trowerpower » Sat Jul 06, 2019 1:46 am

Thanks for your replies, i got two of them from Lakeland Automarine store.
Trower Power
1987 32ft Marinette Sedan Flybridge
Blue Sky
twin 392 Chrysler Stroker Motors
Performance Distributors
750 Edlebrocks
fresh water cooled
1.5 to 1 velva-drives
Onan 6.5kw gen set