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My Kohler 5e marine is cutting off after 10 mins. topped…

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Hi - my Kohler 5e...
Hi - my Kohler 5e marine is cutting off after 10 mins. topped off the coolant and it ran fine for about30 days. its doing the same thing. is bleading the system somwthing i can try myself?
Submitted: 3 years ago.Category: Boat
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Answered in 28 minutes by:
6/25/2015
Marine Mechanic: Tan, MerCruiser Certified Technician replied 3 years ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,419
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Hello. My name is ***** ***** have any signs of coolant in the bilge of the boat? You can go to a auto parts store and rent a cooling system pressure tester. Remove the cap from the coolant system and install the pump and gauge. Now pump up the cooling system to 15 psi now monitor the pressure. Look all around the engine for coolant leaks. If no leaks found externally then you have a leaking head gasket or leaking heat exchanger. Now if you have a head leaking you will have exhaust gases in the coolant. There is a kit for testing for gases in the coolant. Here is a link to the kit. http://www.ryderfleetproducts.com/ryder/af/ryder/core/content/product/srm/oid/276303/erm/productDetail.do?utm_source=googlebase&utm_medium=search&utm_campaign=product&gclid=Cj0KEQjwza6sBRCMiaaPtY_c2tIBEiQAacj5IzTY7Oqa9qVZSJMnIaSgsJvc0PuTgsnE83E3BBlRE8EaAlZe8P8HAQ There is a way to check for coolant in the heat exchanger remove the end cap of the exchanger look for coolant in the raw water.
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