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crazy temperature swings

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BaccoBouncer View Drop Down
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    Posted: June-12-2021 at 6:24pm
I just put in a new thermostat and raw water impeller.  It is the correct thermostat from discount inboard marine (I think a 140F).  We were just out and cruising slow, just off idle.  The temp ran up to over 200F and then when I started moving faster it went down to 120F.
Yes I put the key into the impeller shaft. It's a half moon key and I'm pretty sure if it came out when I inserted the impeller I wouldn't be able to put the cover on.

Where to start?
'97 21' Sport Nautique
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BaccoBouncer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BaccoBouncer Quote  Post ReplyReply Direct Link To This Post Posted: June-12-2021 at 6:25pm
Could I have air in the block?  Is there somewhere to bleed the block?
'97 21' Sport Nautique
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Gary S View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: June-12-2021 at 6:47pm
140 for carbed engines, 160 for fuel injected. You most likely have an air leak somewhere on the intake side of the pump. Check all the hose connections,use a socket to tighten clamps and check the strainer and it's gasket
69 Mustang HM SS
95 Nautique Super Sport
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