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Old 07-20-2015, 10:37 PM
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osmonet osmonet is offline
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MCX Thermostat change, am I being paranoid.

I'm getting temperature swings on the gauge between 165-200, and it doesn't ever really stabilize. As such.....planing on changing the thermostat on my 08 MCX.

Am I being paranoid, or is there a real chance of snapping the bolts? There looks to be a bit of hard water build up on one side.

Engine is a indmar crate engine replaced by dealer 2 years ago. According to records, thermostat was changed at that time. After the engine swap, previous owner put on 12 hours, but in brackish water. I since put on 40 more in fresh water and flushed and drained the engine last fall during winterization (about 15 hours).

So.....am I being paranoid with the bolt snap? Tell me this is noting like those damn tower bolts that seize in place.
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Old 07-20-2015, 10:50 PM
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soak in a good penetrating oil - let it sit for a few days then spray some more.. wait again... then give it a try with a short handled wrench... then try tapping the wrench with a hammer... it's those long breaker bars that spin the heads off bolts.
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Old 07-20-2015, 11:03 PM
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Follow Mike's suggestion and you will be fine.
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Old 07-21-2015, 07:05 PM
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ok. Thanks guys
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Old 07-22-2015, 07:10 PM
Swordfish Swordfish is offline
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Quote:
Originally Posted by osmonet View Post
I'm getting temperature swings on the gauge between 165-200, and it doesn't ever really stabilize. As such.....planing on changing the thermostat on my 08 MCX.

Am I being paranoid, or is there a real chance of snapping the bolts? There looks to be a bit of hard water build up on one side.

Engine is a indmar crate engine replaced by dealer 2 years ago. According to records, thermostat was changed at that time. After the engine swap, previous owner put on 12 hours, but in brackish water. I since put on 40 more in fresh water and flushed and drained the engine last fall during winterization (about 15 hours).

So.....am I being paranoid with the bolt snap? Tell me this is noting like those damn tower bolts that seize in place.
Easy job if you have the right tools. There are 3 bolts, 2 - 9/16 and 1 - 1/2 inch. Use a 1/4 drive nine inch wobbler extension for the two 9/16 bolts. A 3/8 drive didn't work for mine as the throttle body gets in the way. The other 1/2 inch bolt is a piece of cake. Trying to use a wrench those bolts is not fun.
Don't forget to apply some anti-seize to those threads for next time.
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Old 07-22-2015, 07:28 PM
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Originally Posted by Swordfish View Post
Easy job if you have the right tools. There are 3 bolts, 2 - 9/16 and 1 - 1/2 inch. Use a 1/4 drive nine inch wobbler extension for the two 9/16 bolts. A 3/8 drive didn't work for mine as the throttle body gets in the way. The other 1/2 inch bolt is a piece of cake. Trying to use a wrench those bolts is not fun.
Don't forget to apply some anti-seize to those threads for next time.
Thanks for the response, but I only see two bolts. Please advise.
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  #7  
Old 07-23-2015, 03:53 AM
Gert Gert is offline
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This is mine, boat is from 2004, dunno if it were two or three bolts:

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