I have a smooth running 1981 Mercruiser 470 that runs cool and has good pressure on all cylinders as well as oil. The last 2 trips out I've had a strange intermittent screeching sound coming from the motor when I hit 3000 rpm and above. Alternator belt looks good and I haven't confirmed the alt...
My 20' Glasply came with a 1.65 ratio 165 Merc stern drive with an 18P prop mated to my 1981 470. My boat will not go over 3800 RPM at WOT but runs nicely at 3000 rpm. Its when I go above 3000 rpm that things go awry. It runs rough and surges. Could this be due to the wrong gear ratio / prop...
I own a 1981 Glasply 2100 HT with same year Merc 470. The motor runs great and is very quiet when standing outside next to the dog house but when I get in under the hardtop in the covered area and sit at the helm its really loud. It seems that maybe the sound is somehow coming through the floor...
Just wanted an opinion as I'm not too experienced with outboard repairs. On Sunday I replaced my lower unit gear oil, replaced my spark plugs and ran some seafoam through the carb and let her run in the tub for 20 minutes and she ran like a charm. Everything seemed great and ready for some...
Hi and thanks for allowing me into this very informative forum. My problems began when my motor would turn over but had no spark. The marine mechanic troubleshooted the electrical and said the stator was dead. New stator in and I launched the boat today and I couldn't start the motor, it would...
