The Yanmar temperature switch 128275-91340 is a temperature alarm switch for directly cooled Yanmar marine diesel engines from the GM and HM series. The switch is part of the temperature protection system and is designed to activate the temperature alarm when the cooling water temperature reaches the switching temperature of 65\u00b0C.<\/p>\n
Reliable temperature protection is important for detecting engine overheating in time. When the cooling system is not functioning properly, the engine temperature can rise rapidly. The temperature switch helps the operator detect abnormal temperatures before serious engine damage occurs.<\/p>\n
Brand:<\/strong> Yanmar This temperature switch is used on directly cooled versions of the following Yanmar marine diesel engines:<\/p>\n Suitable for:<\/strong> The correct temperature switch depends on the exact engine type and cooling system configuration. Before ordering, check whether the engine is directly or indirectly cooled and whether the specified switching temperature is 65\u00b0C.<\/p>\n The temperature switch monitors the cooling water temperature in the engine. At normal operating temperatures, the switch remains in its normal switching position. When the temperature reaches the specified switching value, the electrical switch contact changes state.<\/p>\n This activates the connected temperature alarm. Depending on the engine installation, this may be a warning light or an audible alarm on the instrument panel.<\/p>\n The temperature switch is designed to activate an alarm. It is not a temperature sender for continuously displaying the cooling water temperature on an analogue temperature gauge.<\/p>\n This version has a switching temperature of 65\u00b0C and is intended for Yanmar engines with direct seawater cooling. In this type of cooling system, seawater flows directly through the engine’s cooling passages to dissipate heat.<\/p>\n Indirectly cooled engines generally use a separate closed coolant circuit, where heat is dissipated through a heat exchanger. These installations may have a different normal operating temperature and require a different temperature switch.<\/p>\n When replacing the switch, it is therefore important to check not only the engine type but also the cooling system configuration and the specified switching temperature.<\/p>\n A marine diesel engine continuously generates heat during operation. The cooling system removes this heat to keep the engine temperature within the permitted limits.<\/p>\n When the cooling system is not functioning properly, the engine temperature may rise. Possible causes include:<\/p>\n Insufficient cooling water supply:<\/strong> A closed seacock or blocked water intake. The temperature switch helps detect excessive temperatures. The switch does not solve a cooling problem itself but provides important protection by warning the operator in time.<\/p>\n A faulty temperature switch may prevent the temperature alarm from activating when the engine overheats. A fault in the switch or wiring may also cause a false alarm.<\/p>\n If the alarm system is not operating reliably, the temperature switch, wiring, connections and instrument panel should be inspected.<\/p>\n Replace the temperature switch if testing shows that it no longer switches at the specified temperature or if the component is damaged.<\/p>\n Before replacement, check that the new temperature switch matches the specified version for the engine. Pay particular attention to the switching temperature, electrical connection and mechanical fit.<\/p>\n Only carry out work on the cooling system when the engine has cooled down sufficiently. Install the new temperature switch according to Yanmar’s instructions.<\/p>\n After installation, check that the connection is watertight and that the temperature alarm system functions correctly. Use the inspection procedure from the maintenance documentation of the relevant<\/p>\n","protected":false},"excerpt":{"rendered":" The Yanmar temperature switch 128275-91340 is a temperature alarm switch for directly cooled Yanmar marine diesel engines from the GM and HM series. The switch monitors the cooling water temperature and activates the temperature alarm at 65\u00b0C to warn the operator of possible engine overheating.<\/p>\n A properly functioning temperature switch is important for protecting the marine diesel engine. If the cooling water temperature becomes too high, this may indicate insufficient cooling water circulation, a blockage or another problem in the cooling system. The switch helps the operator detect these issues in time and prevent potential engine damage.<\/p>\n This temperature switch is intended for directly cooled Yanmar GM and HM engines, where seawater flows directly through the engine cooling system. When replacing the switch, check the exact engine type, cooling system and specified switching temperature. Indirectly cooled engine versions may require a different temperature switch.<\/p>\n Brand:<\/strong> Yanmar
\nProduct type:<\/strong> Temperature switch
\nFunction:<\/strong> Cooling water temperature alarm
\nSwitching temperature:<\/strong> 65\u00b0C
\nCooling system type:<\/strong> Directly cooled
\nApplication:<\/strong> Temperature protection for marine diesel engines
\nEngine series:<\/strong> GM and HM series<\/p>\nSuitable for Yanmar marine engines<\/h4>\n
\nYanmar 1GM
\nYanmar 1GM10
\nYanmar 2GM
\nYanmar 2GM20
\nYanmar 2GM20-YEU
\nYanmar 3GM
\nYanmar 3GM30
\nYanmar 3GM30-YEU
\nYanmar 3HM
\nYanmar 3HM35<\/p>\nHow the temperature switch works<\/h4>\n
Specifically for directly cooled engines<\/h4>\n
Why is a functioning temperature protection system important?<\/h4>\n
\nClogged seawater strainer:<\/strong> Restricted seawater supply.
\nDamaged impeller:<\/strong> Insufficient cooling water circulation.
\nBlockage:<\/strong> Restricted flow in the cooling system.
\nFaulty thermostat:<\/strong> Incorrect regulation of cooling water flow.<\/p>\nWhen should the temperature switch be replaced?<\/h4>\n
Installation and replacement<\/h4>\n
Key features and benefits<\/h4>\n
\nProduct type:<\/strong> Temperature switch \/ cooling water alarm switch
\nSuitable for:<\/strong> Yanmar 1GM\/1GM10, 2GM\/2GM20, 3GM\/3GM30 and 3HM\/3HM35
\nSwitching temperature:<\/strong> 65\u00b0C
\nCooling system type:<\/strong> Directly cooled (seawater cooling)
\nFunction:<\/strong> Activates the temperature alarm when the cooling water temperature becomes too high
\nApplication:<\/strong> Temperature protection for marine diesel engines
\nBenefit:<\/strong> Helps detect overheating and potential engine damage in time
\nMaintenance:<\/strong> Replace if the alarm function is faulty or unreliable<\/p>\n","protected":false},"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":[],"location":[],"product_brand":[28034],"product_cat":[19124,22115],"product_tag":[],"class_list":["post-433747","product","type-product","status-publish","product_brand-yanmar","product_cat-engine-parts-yanmar","product_cat-parts-by-brand","first","outofstock","sale","taxable","shipping-taxable","purchasable","product-type-simple"],"group_of_quantity":0,"min_quantity":0,"max_quantity":"","exclude_order_quantity_value_rules":"no","exclude_category_quantity_rules":"no","combine_variations":"no","locations":[{"id":15425,"name":"Gebr. Van Enkhuizen","slug":"gebr-van-enkhuizen","quantity":""}],"_links":{"self":[{"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product\/433747","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/comments?post=433747"}],"wp:attachment":[{"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/media?parent=433747"}],"wp:term":[{"taxonomy":"location","embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/location?post=433747"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product_brand?post=433747"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product_cat?post=433747"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product_tag?post=433747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}