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Replacing thermostat Johnson 1975 70 HP

boatiebur

New member
Recently purchased a thermostat for my Johnson 70 hp and have identified what needs to be done. I have done some reading on this topic but I'm worried about snapping a bolt on the powerhead. Are there any ways to try and prevent this from happening. Should i heat the engine up first. Should i use WD40 etc before attempting to loosen the bolts. Thanks :D
 
Go talk to somebody that has done it before. Also get rid of the WD40. Get some ATF and Acetone and mix them up 50-50.
 
On a fresh water motor the bolts will come out.-----If you are feared. -----drill the heads off the bolts.----Remove the cover and the bits in there.-----Now you can see the area you need to heat to get the bolts out.
 
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