I have recently purchased a 1984 Bayliner open bow (Carpi ?) Volvo engine, 270 outdrive. This is my first boat... after replacing the points it runs like a top. Last weekend, first time in the water, it seems to heat up if I run it over 3,000 RPMs. If I keep it around 2,500 or less it will maintain a running temp. I also have a small drip from what I assume is the "raw water" pump.
Is my problem a symptom of an impeller that needs replacing? There is also a shaft and seal kit... is that needed also? I'm not sure how to proceed as I know I have a 270 outdrive but I can't find a serial plate on the engine. Am I to assume this is the AQ125 (A or B?) 4 cylinder Volvo?
Is it likely that the problem is with the circulating pump rather than the raw pump? I'm searching for any tips or information related to this old boat.
First thing I'd do would be to replace the thermostat. Do keep an eye on the circulating pump though. As far as the complete kit is concerned I'd go ahead and do it. No telling how long the impeller has been in there.
Thermostats are a lot cheaper than pumps or impellerr kits.
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I've also just bought an 84 bayliner capri with a volvo sterndrive setup in it. The plate on my motor is on the port side of the block on the protrusion where the starter mounts. My seawater pump was ok but the two seals where the lines bolt on were shot. I got mine from marinepartsexpress.com for about 4 bucks each. Hope that helps.
You most likely have an AQ125A with a 270 outdrive, standard issue on that particular boat.
Obviously do the cheap stuff, including impeller (you just need the impeller and gasket for this. . .and it should be done every couple years. The thermostat is cheap, but I've never heard of an engine overheating because of a bum thermostat all by itself.
Now, your issue is probably on the outdrive. This setup is notorious for corrosion on the goose-neck "thing" that connects your lower-unit pickup to a rubber hose (kinda the size/shape of a radiator hose) and through the transom. The goose-neck thing might look like it's in perfect shape, but it probably has small pits or cracks inside the hose that you can't see. It will pass water through just fine when it's totally submerged (because it's sucking water through those holes, too). . .but once you're running at speed, the goose-neck is out of the water, it allows some air to pass through, and you get a water/air mixture to your raw water pump.
It's a cheap fix, too. . .replace that neck, its gasket, and the hose while you're in there messing around.
1984 Bayliner Volvo heats up / new boater
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