Raw water pump ?
#1
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My 87 242 has the dreaded 454/alpha combo I have not had any problems yet. But one thing that I can not handle is my temp gauge goes up after a short run. It happens when you come off plane and shift into netural it heads toward 180+, at that point I give it a little gas and it comes down slowly. I talked to my shop and he said this engine combo would benefit from a raw water pump. My impeller and thermostat are new.
They don`t seem to had to install,I will assume I am not the only one with this.Any feed back would be great
Thanks
mark
They don`t seem to had to install,I will assume I am not the only one with this.Any feed back would be great
Thanks
mark
#3
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Re-read your post - you say your impeller is new. It still sounds like a bad impeller to me. Could it have been run dry for a short time? Doesn't take much time to degrade an impeller.
I still don't get the thing about benefitting from a raw water pump. As I said above, you already have one. Do they mean you should try an engine-mounted pump like a Bravo? If so, there won't be any appreciable flow advantage from that.
??????
I still don't get the thing about benefitting from a raw water pump. As I said above, you already have one. Do they mean you should try an engine-mounted pump like a Bravo? If so, there won't be any appreciable flow advantage from that.
??????
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Third, That is what I was thinking about a pump mounted to the engine block. I will change the impeller first and go from there. My shop said this was one of the many reasons way the alpha is not a good choice for a BBC.
Thanks
Thanks
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OK, I got what your saying now. But, I don't believe the raw water supply of an Alpha is any less adequate than that of a Bravo. I think the only reason the pump was ever moved from the drive to the engine-mounted location on a Bravo is that the Bravo is heavier-duty and there was insuficient room in the Bravo case to include a water pump. Could be wrong but that's what I understood. We could post this question over in the Tech/Drives section, I'm sure someone knows.
#8
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Bravos have the pump inside because they shift in the upper so in neutral the vertical shaft is not turning and would cause overheating. Alphas shift in the lower gearcase.
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The Alpha is basicaly a crash box, has an ignition interupt switch that cuts out the engine for nano-second when shifted. The water pump is a similiar impeller in a cup deal, and sits in the top of the lower unit case, spun by the vertical shaft.
My 32 Pachanga had a 454 Alpha set up, one converted to counter rotation, and it worked fine for some 550 hours over six years.