Thermostat for mercury outboard

Thermostat for mercury outboard DEFAULT

How do I Replace Thermostat Mercury 200Hp?

Thermostat Removal

Press down on the top cover lock. Lift the top cover up, forward and away from the motor. Make the boat safe to work on by removing the battery cables from the battery.

Locate the thermostat cover on the top of each cylinder head; it's a small oval-shaped cover, secured by two bolts. Draw a small match-mark between the cylinder head and the cover with a paint stick. Remove the bolts with a 14 mm thin-walled socket and extension and pull the cover from the cylinder head.

Lift the thermostat out of its compartment, taking note of the direction in which the flange side facing the cover is installed. On most Mercury 200s, thermostats are installed with the flange side facing the cover but there are variations.

Remove the old gasket and any gasket material from the middle of the thermostat cover if it remained attached to the cover as you removed it. Clear any foreign matter from the compartment with a toothbrush and scrape the gasket material loose with a standard slotted screwdriver.

Thermostat Installation

Install the new thermostat seal in the compartment. Slide the thermostat through the seal.

Set the gasket on top of the thermostat and return the gasket cover to its position, using the match-mark to determine its orientation. Cover the threads of the cover retaining bolts with two-stroke motor oil and thread the bolts into place.

Tighten the bolts alternately, and in stages, to 20 foot-lbs plus a quarter turn of the wrench.

References

  • "Mercury Marine Outboard Repair Manual 2-250 HP 2-Stroke 2001-2009"; Seloc Marine; 2009

Tips

  • Do not use any gasket sealing compound on the thermostat housing gasket.

Writer Bio

Will Charpentier is a writer who specializes in boating and maritime subjects. A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. He is also a certified marine technician and the author of a popular text on writing local history.

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Thermostat (143 Degrees)833072003

Thermostat (143 Degrees)-833072003
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Product Fitment Grid

This guide is to be used as a reference only. You must verify fitment using your model or serial number.

BRANDMODEL199419951996199719981999200020012002200320042005
Mariner Outboard115DFI [EXLPTO]------x-----
Mariner Outboard115DFI [L DIG SW]------x-----
Mariner Outboard115DFI [L DIG]------x-----
Mariner Outboard115DFI [L SW]------x-----
Mariner Outboard115DFI [L]------x-----
Mariner Outboard115DFI [XL DIG SW]------x-----
Mariner Outboard135DFI-----x------
Mariner Outboard135DFI [CXL DIG SW]------xx----
Mariner Outboard135DFI [CXL]----xxxx----
Mariner Outboard135DFI [L DIG]------xxxxxx
Mariner Outboard135DFI [L]----xxxx----
Mariner Outboard135DFI [XL DIG SW]------x-x-xx
Mariner Outboard135DFI [XL DIG]-------x----
Mariner Outboard135DFI [XL]----xxxx----
Mariner Outboard150DFI [CXL DIG SW]------x-x-x-
Mariner Outboard150DFI [CXL DIG]-------x----
Mariner Outboard150DFI [CXL]----xxxx----
Mariner Outboard150DFI [L DIG]------xxx-xx
Mariner Outboard150DFI [L]----xxxx----
Mariner Outboard150DFI [XL DIG SW]------x-x-xx
Mariner Outboard150DFI [XL DIG]-------x----
Mariner Outboard150DFI [XL]----xxxx----
Mariner Outboard175DFI [CXL]-------x----
Mariner Outboard175DFI [L DIG]-------xx-xx
Mariner Outboard175DFI [L]-------x----
Mariner Outboard175DFI [XL DIG]-------x----
Mariner Outboard175DFI [XL]-------x----
Mariner Outboard200DFI [CXL]---x--------
Mariner Outboard200DFI [L]---x--------
Mariner Outboard200DFI [XL]---x--------
Mariner Outboard200EFI [L]------x-----
Mariner Outboard225 [CXL CARB]----xxx-----
Mariner Outboard225 [CXL EFI SW]------xx----
Mariner Outboard225 [CXL EFI]--xxx-------
Mariner Outboard225 [CXL]xxxxxxx-----
Mariner Outboard225 [CXXL CARB]----xxx-----
Mariner Outboard225 [CXXL EFI]--xxxxxx----
Mariner Outboard225 [CXXL]xxxx--------
Mariner Outboard225 [EFI]---xxx------
Mariner Outboard225 [L CARB]----xx------
Mariner Outboard225 [L EFI]-xxx--xx----
Mariner Outboard225 [L]xxxx--xx----
Mariner Outboard225 [XL CARB]----xx------
Mariner Outboard225 [XL EFI SW]------xx----
Mariner Outboard225 [XL EFI]--xxx-------
Mariner Outboard225 [XL]xxxx-xxx----
Mariner Outboard225 [XXL CARB]----xxx-----
Mariner Outboard225 [XXL EFI SW]------xx----
Mariner Outboard225 [XXL EFI]--xxxx------
Mariner Outboard225 [XXL]xxxx--------
Mariner Outboard250 [CXL EFI SW]------xx----
Mariner Outboard250 [CXL EFI]--xxxx------
Mariner Outboard250 [CXXL EFI]--xxxxxx----
Mariner Outboard250 [XL EFI SW]------xx----
Mariner Outboard250 [XL EFI]--xxxx------
Mariner Outboard250 [XXL EFI SW]------xx----
Mariner Outboard250 [XXL EFI]--xxxx------
Mercury Outboard115DFI [CXL DIG SW]------x-----
Mercury Outboard115DFI [CXL SW]------x-----
Mercury Outboard115DFI [L DIG SW]------x-----
Mercury Outboard115DFI [L DIG]------x-----
Mercury Outboard115DFI [L SW]------x-----
Mercury Outboard115DFI [L]------x-----
Mercury Outboard115DFI [XL DIG SW]------x-----
Mercury Outboard115DFI [XL SW]------x-----
Mercury Outboard135DFI-----x------
Mercury Outboard135DFI [CXL DIG SW]------x--xxx
Mercury Outboard135DFI [CXL DIG]-------xx-xx
Mercury Outboard135DFI [CXL]----xxxx----
Mercury Outboard135DFI [L DIG SW]------xxxxxx
Mercury Outboard135DFI [L DIG]------xxxxxx
Mercury Outboard135DFI [L SW]------xx----
Mercury Outboard135DFI [L]----xxxx--xx
Mercury Outboard135DFI [XL DIG SW]-------xxxxx
Mercury Outboard135DFI [XL DIG]------xxxxxx
Mercury Outboard135DFI [XL]----xxxx----
Mercury Outboard150 [L]------x-----
Mercury Outboard150DFI----x-------
Mercury Outboard150DFI [CXL DIG SW]------xxxxxx
Mercury Outboard150DFI [CXL DIG]-------x-xxx
Mercury Outboard150DFI [CXL]----xxxx----
Mercury Outboard150DFI [L DIG SW]------xxxxxx
Mercury Outboard150DFI [L DIG]------xxxxxx
Mercury Outboard150DFI [L SW]------xx----
Mercury Outboard150DFI [L]----xxxx----
Mercury Outboard150DFI [XL DIG SW]------xxxxxx
Mercury Outboard150DFI [XL DIG]-------xxxxx
Mercury Outboard150DFI [XL]----xxxxx---
Mercury Outboard175DFI [CXL DIG SW]-----------x
Mercury Outboard175DFI [CXL DIG]-------x--x-
Mercury Outboard175DFI [CXL]-------x----
Mercury Outboard175DFI [L DIG SW]-------x----
Mercury Outboard175DFI [L DIG]-------xxxxx
Mercury Outboard175DFI [L SW]-------x----
Mercury Outboard175DFI [L]-------x----
Mercury Outboard175DFI [XL DIG SW]----------xx
Mercury Outboard175DFI [XL DIG]-------xxxxx
Mercury Outboard175DFI [XL]-------x----
Mercury Outboard200DFI [CXL]---x--------
Mercury Outboard200DFI [L]---x--------
Mercury Outboard200DFI [XL]---x--------
Mercury Outboard225 [CXL]xxxxxxxx----
Mercury Outboard225 [CXXL EFI]----x-------
Mercury Outboard225 [CXXL]xxxxxxx-----
Mercury Outboard225 [L]xxxxxxx-----
Mercury Outboard225 [XL]xxxxxxxx----
Mercury Outboard225 [XXL]xxxxxxx-----
Mercury Outboard225EFI [CXL SW]------xx----
Mercury Outboard225EFI [CXL]-xxxxxx-----
Mercury Outboard225EFI [CXXL]--xx-xxx----
Mercury Outboard225EFI [EFI]------x-----
Mercury Outboard225EFI [L]-xxxxxxx----
Mercury Outboard225EFI [XL SW]------xx----
Mercury Outboard225EFI [XL]-xxxxx------
Mercury Outboard225EFI [XXL SW]------xx----
Mercury Outboard225EFI [XXL]-xxxxx------
Mercury Outboard250 [CXL EFI SW]-------x----
Mercury Outboard250 [CXL EFI]--xxxxx-----
Mercury Outboard250 [CXXL EFI]--xxxxx-----
Mercury Outboard250 [XL EFI SW]-------x----
Mercury Outboard250 [XL EFI]--xxxxx-----
Mercury Outboard250 [XXL EFI SW]------xx----
Mercury Outboard250 [XXL EFI]--xxxx------
Mercury Outboard250EFI [CXXL SW]-------x----
Mercury Outboard250EFI [L PRO XB]------xxx---
Mercury Outboard250EFI [L]----x-------
Mercury Race Outboard200 XS [CS NO G/C]----------x-
Mercury Race Outboard200 XS [CS SM]-------xx--x
Mercury Race Outboard200 XS [L NO G/C]----------xx
Mercury Race Outboard200 XS [L SM]-------xxxxx
Mercury Race Outboard200 XS [L TM]-------xxxxx
Mercury Race Outboard200 XS [L]-------x----
Mercury Race Outboard200 XS [OPTIMAX]---------xx-
Mercury Race Outboard200 XS [S NO G/C]----------xx
Mercury Race Outboard200 XS [S SM]-------xxxxx
Mercury Race Outboard200 XS [S]-------x----
Mercury Race Outboard3.0L [CL]-----x------
Mercury Race Outboard3.0L [L MAGNUM]----x-------
Mercury Race Outboard3.0L [L]-----x------
Mercury Race Outboard3.0L [PRO-MAX]----xx------
Mercury Race Outboard300 PM [CL FM]------x-----
Mercury Race Outboard300 PM [CL SM]------x-----
Mercury Race Outboard300 PM [CXL FM]------x-----
Mercury Race Outboard300 PM [CXL SM]------x-----
Mercury Race Outboard300 PM [L FM]------x-----
Mercury Race Outboard300 PM [L NO G/C]------x-----
Mercury Race Outboard300 PM [L SM]------x-----
Mercury Race Outboard300 PM [L TM]------x-----
Mercury Race Outboard300 PM [L]------x-----
Mercury Race Outboard300 PM [RACE]------x-----
Mercury Race Outboard300 PM [XL FM]------x-----
Mercury Race Outboard300 PM [XL NO G/C]------x-----
Mercury Race Outboard300 PM [XL SM]------x-----
Mercury Race Outboard300 [CL SM]-----x------
Mercury Race Outboard300 [CXL FM]-----x------
Mercury Race Outboard300 [L SM]-----x------
Mercury Race Outboard300 [L TM]-----x------
Mercury Race Outboard300 [PRO-MAX]----xx------
Mercury Race Outboard300 [PROMAX]----xx------
Mercury Race Outboard300 [SUPER MAG]-----x------
Mercury Race Outboard300 [XL FM]-----x------

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Can I run my Mercury outboard without a thermostat?

Yes, you can temporarily run your outboard without the thermostat and not harm the engine. No, you can not remove the thermostat and continue running the engine for long periods of time without causing harm to the engine. Here is a brief breakdown on why the thermostat is so important.

Click to see full answer.


People also ask, what happens when you run a boat without a thermostat?

You can run no thermostat but Will cause your motor to make oil ,if in the winter it Will cause the engine too sweat . Will affect how your auto choke works and your warm up will be longer . Will be harder to tune both engines to run the same.

Furthermore, does a boat motor need a thermostat? Thermostat. One of the least appreciated components of an outboard motor is the lowly thermostat. A thermostat regulates the temperature of the water for engine cooling and keeps pressure in the cooling system to facilitate heat transfer from the heads and the cylinder walls.

Consequently, can you run a motor without a thermostat?

The car will run fine without it. There is another thermostat on the radiator of the water cooling system. Some cars have a thermal operating valve that opens and closes with the engine temperature controlling the water flow independently of the thermostat. Most cars radiators will have a fan fired on the radiator.

Is it OK to run outboard without thermostat?

Yes, you can temporarily run your outboard without the thermostat and not harm the engine. No, you can not remove the thermostat and continue running the engine for long periods of time without causing harm to the engine. Here is a brief breakdown on why the thermostat is so important.

Sours: https://askinglot.com/can-i-run-my-mercury-outboard-without-a-thermostat
Mercury Thermostat Replacement

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For outboard thermostat mercury

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Thermostat Replacement For Mercury 2-stroke 6.0 8.0 9.9 15 HP 1986-2006 Martin Marine Episode 1

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