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Thread: ok need to replace my thermastat.

  1. #1
    SHREK & VAL mikezx1's Avatar
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    Default ok need to replace my thermastat.

    i have a chevy 350 small block. how much and how hard to do.
    1983 CJ 7 w/350 small block w\TBI, SM 465 trany, NP 205, dana 60 full size, 14 bolt full size, 39.5" Iroq, plus more
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  2. #2
    Senior Member Sr. Beaver's Avatar
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    Cheap and super easy, 2 bolts and it's out. Drain the radiator, doesn't need to be all of it just enough to get the level below the stat housing, pop old one out clean mating surfaces and a light coat of RTV on threads of bolts tighten them up refill coolant start it up let run, check for leaks top of radiator as needed. Once engine is up to temp coolant is full you're done.
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  3. #3
    Senior Member SavageSun4x4's Avatar
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    U will NEED to burp engine

    http://www.savagesun4x4.com/enter/te...ussion_ii.html


    Purging, 'burping' the air out of the radiator-heater-engine system:

    The problem occurs when you get an air pocket in the system and as a result it will*continually*overheat. **

    To that end here is how I learned to do it and know for a fact it works. *I grew up on a ranch and we had ranch trucks, tractors and various stuff that had engines and radiators. *Some of them would have the radiator drained as they sat up all winter. *This is how we did it:

    1) *Remove the radiator cap on the radiator and inspect it for corrosion, proper functioning and the rubber seal. *Replace if needed, but leave off to purge.

    2) *Start you engine and let it idle [caution: *do this with the engine at cold]

    3) *Keep watching the radiator fill and add fluid as the fluid level drops. *'rev' the engine slowly up to about 2k rpm and let it slowly come back down to idle. *Do it too fast and it will cause the fluid to ebb and flow too quickly and overflow. *Also have the heater turned on max while doing this.

    4) *Watching the radiator fill and the temp gage let the engine come to normal operating temp and insure by revving it a few times that all the air bubbles in the engine, hoses and heater have dissipated. *Generally revving the engine will purge all the air.

    5) *Leaving the radiator cap off, now fill your plastic radiator reservoir aka 'thumper keg' with radiator fluid to the full mark.

    6) *Replace radiator cap, turn off heater (if its summer) and test drive doing some high speed freeway driving. *Check the thumper keg when you return, add fluid if needed and check fluid again after the engine has had a complete cool down, add fluid if needed.
    Don

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  4. #4
    Senior Member HillBillE's Avatar
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    Don, forgot to add "Get up to operating temp" so the new T-stat opens. Makes the burping go easier!

    FWIW, On a SBC, I never had to purge one. Even with the weird radiator I had in the CJ. Then again, up here, we never really had to worry about overheating like you do down south.

    Lake Superior keeps us pretty cool up here, even in the summer!


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    Bobble Head Jeeper trailsnail's Avatar
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    When do you plan on changing out the t-stat? I might be able to slip out of the house for a few to help. I plan on running to Lowes sometime today to get a couple of small things.
    Sven
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