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Author Topic:   Mercury OptiMax: Changing Tromostats
castnover posted 04-17-2005 10:16 PM ET (US)   Profile for castnover   Send Email to castnover  
How difficult is it to change the tromostat on a Mercury OptiMax outboard? What to look for?

"Hi" to all my buddies. It been a long winter. I is ready to boating. Loking foward in seeing you guys.

John O--What is up? Brother. Some nice weather we are having in g-town.

lakeman posted 04-18-2005 06:41 AM ET (US)     Profile for lakeman  Send Email to lakeman     
I have changed my thermostats for a PROBLEM with over heating, and it is not hard to do, but there are two types one with a gasket and one without as I remember, old age syndrome. The starboard side you have to loosen the, I think, fuel rail a little, to get it to come out but no problem. The thermostats for mine were around $50. I have a 2000 135 opti.
Clark Roberts posted 04-18-2005 09:00 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Yes, as Lakeman says, you must move the fuel rail on stbd side back to remove the two bolts securing the thermostat housing. Just remove the two 5/8 hex nuts on the rail and slide it back (it's "O-ring" sealed and will slip right back in place). Spruce Creek Navy
castnover posted 04-18-2005 06:20 PM ET (US)     Profile for castnover  Send Email to castnover     
lakeman,clark i was talking to a Mercury dealer this weekend and he was telling me that in 2001 the had some trouble with the tromostats and changed design he had me look and see if i had a white dot on the cover or a nipple that stuck out kinda confussed any info on that?? it looks like i have 2 sets of tromostats 2 for each engine?
lakeman posted 04-19-2005 06:32 AM ET (US)     Profile for lakeman  Send Email to lakeman     
Sorry I cannot help you on that PROBLEM, I have never looked at a 2001 thermostat setup.
Clark Roberts posted 04-19-2005 07:43 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Lake, my 135 Opti was a 2000 model and I don't know about the 2001... hummmmmmm? Somebody out there probably knows the answer!
jimh posted 04-19-2005 08:20 AM ET (US)     Profile for jimh  Send Email to jimh     
I know those new OptiMax engines run well, but it sounds like working on them is a pain. Remove the fuel rail to change a tromostat! Yikes/
castnover posted 04-19-2005 06:32 PM ET (US)     Profile for castnover  Send Email to castnover     
jimh i know they make them so only dealers can work on them but try to find a dealer with time just like plumbers lol
kingfish posted 04-19-2005 09:42 PM ET (US)     Profile for kingfish  Send Email to kingfish     
...grumble, grumble...I can't even find my dam tromostat with both hands...grumble, grumble...
crabby posted 04-28-2005 11:54 AM ET (US)     Profile for crabby  Send Email to crabby     
Man, I'm glad there are no tromostats on my 90 e-tec....

and I am almost certain there are none on my old 70hp 'rude that's waiting for a new least in 20 years I never encountered one!

bluewaterpirate posted 04-28-2005 01:13 PM ET (US)     Profile for bluewaterpirate  Send Email to bluewaterpirate     
You have to remove the fuel rails to change the plugs ...... not that complicated .....

Cheers ...... Tom

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