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  1. J

    Water Pipe Temperatures on 4.3 Mercruiser - Hot / Cold?

    Hi, Just a quick one I hope. I managed to get the engine running yesterday thanks to the help from this forum and wanted to double check the temperature of the water pipes (simply hot and cold) and if mine is normal. The boat is new to me and i've not had an sterndrive before. After a few...
  2. J

    2004 Mercruiser 4.3 Fuel Pump Fittings - NPT, UNF, or Other?

    Hi all, I ordered a fuel pump pressure tester the other and all the fittings supplied with it are Metric (as i'm UK Based). I'm having trouble finding the correct fittings just to give a barbed end, I was under the impression they should be NPT from other posts I have read? However, a local...
  3. J

    Need Help Identifying A Mercruiser 4.3L Component (Sensor / Switch)

    Hi While trying to diagnose a problem with my (recently new to me) Mercruiser 4.3L (Serial No: 0W034153), I came across a rusty looking sensor / switch hidden between the distributor and the coil area at the back of the engine. It has a brown and a colour stripe (can't make out the colour...
  4. J

    Mercruiser 4.3L Cranks, Has Sparks & Fuel, But Will Not Fire Up

    Bit of Background Early this year (2025) I bought a second hand Maxum 1800 SR3 with 4.3L Mercruiser in visibly reasonable condition, some service history, lots of documentation and many of the larger items recently done - invoices for bellows, risers, etc. It took a couple of attempts to start...
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