Search results

  1. NC State Guy

    Faulty NEW Temp Sender/Gauge?

    1980 Merc 470 3.7L serial#5520896 I have read extensively on the temp/overheating threads in these forums before posting. I have been concerned that my engine was running hot the last couple weeks...Gauge reads 210-220 under load. Changed sender and tried it with 2 different gauges--same...
  2. NC State Guy

    temperature sender question

    1980 mercruiser 470 serial 5520896. Got a new temp gauge and sender today. Wanted to replace old color code temp gauge with real numbers. The sender threads were too small so I left the old sender in to see if it worked. no dice. gauge got up to 130F, thermom in exhaust man got up to 165F...
  3. NC State Guy

    closed cooling system check

    1980 mercruiser 470 ser#5520896 I'm not sure if my circulating pump is working or if I may have clogged passages in my cooling system. I can feel air pockets in the hoses is the presence of any air in the system not normal? Is there a way to check the circ pump with out removal? I have a new...
  4. NC State Guy

    Engine Temps

    Mercruiser 470, 2 BBL, 1980 model, serial number 5520896 I am breaking in a rebuilt motor and am concerned about overheating issues. The motor otherwise runs fine. The coolant reservoir has had to be refilled twice with 1/3 gallon with less than one hour run total time, 3 20 minute test runs...
  5. NC State Guy

    Vapor Lock?

    Thanks to this great forum I have been able to rebuild my 1980 Searay with mercruiser 470. I have taken her out 3x for some nice test runs. I have an issue with what I believe to be vapor lock all three times. Symptoms: Starts fine when cold, runs great, when stopped for 30 min or so, the...
Top