{"product_id":"volvo-774","title":"Volvo Penta Thermostat Housing Cover O-Ring 3858938","description":"\u003cp\u003eVolvo Penta 3858938 is a genuine OEM O-ring used in select Volvo Penta sealing applications. Current active parts listings consistently identify it as an original Volvo Penta O-ring, and the strongest application language available links it to thermostat-housing service associated with a flat cover plate, making it a practical replacement whenever that sealing point is opened during cooling-system work.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Volvo Penta OEM part number 3858938.\u003c\/li\u003e\n\u003cli\u003eCommonly described as an O-ring for thermostat housing service.\u003c\/li\u003e\n\u003cli\u003eAssociated with a flat cover plate style sealing location.\u003c\/li\u003e\n\u003cli\u003eCurrent cross-reference listings also associate this part with reference number 3588638.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe strongest supportable application detail reviewed points to thermostat-housing use rather than a broad engine-family claim. Because current listings do not provide a clean, model-by-model OEM fitment breakdown in the visible source text, the safest compatibility language is to treat 3858938 as a thermostat-housing sealing O-ring that should be matched to the correct Volvo Penta parts schematic and serial-specific application before ordering.\u003c\/p\u003e\n\u003ch2\u003eSerial Number Fitment Notice\u003c\/h2\u003e\n\u003cp\u003eVolvo Penta sealing parts can vary by engine version, housing design, and production break. Match part number 3858938 to your engine serial number and the correct thermostat or cooling-system parts diagram before ordering to confirm the exact sealing location.\u003c\/p\u003e\n\u003ch2\u003eWhen This Part Needs Replacement\u003c\/h2\u003e\n\u003cp\u003eReplace this O-ring anytime the related thermostat housing or cover plate is removed for service, or when the original seal shows flattening, hardening, cracking, swelling, or signs of coolant seepage. Replacing the seal during reassembly is usually the better choice than reusing an older compressed O-ring.\u003c\/p\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eInstall on a clean sealing surface and compare the old O-ring carefully against the new OEM part before assembly. A light coat of the appropriate assembly lubricant or clean coolant can help prevent pinching during installation. Avoid twisting, over-stretching, or reusing an aged seal in a thermostat-housing application.\u003c\/p\u003e\n\u003ch2\u003eAlternate\/Superseded Part Numbers\u003c\/h2\u003e\n\u003cp\u003eCurrent reviewed sources continue to list 3858938 as the active Volvo Penta OEM number. Related cross-reference listings also show 3588638 in connection with this part number for reference purposes.\u003c\/p\u003e\n\u003ch2\u003eParts Desk Insight\u003c\/h2\u003e\n\u003cp\u003eWith small thermostat-housing O-rings, the easy mistake is reusing the old seal because it still looks acceptable on the bench. In practice, replacing it while the housing is already apart is usually the cheaper move than reopening the same job for a minor seep later.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"VOL","offers":[{"title":"Default Title","offer_id":43564033048612,"sku":"3858938","price":8.1,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/1236af95-cff0-4b71-8d45-c1a88838eb43.png?v=1776461288","url":"https:\/\/marisolmarine.com\/products\/volvo-774","provider":"Marisol Marine Company","version":"1.0","type":"link"}