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tuffyluffy last won the day on March 11

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About tuffyluffy

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  1. The rhythm and noise sounds to me like compression exiting the engine, possibly through an intake valve? Is there any blow-back coming from the air filter? Bit odd that its a not regular though.
  2. That'll buff out
  3. Ditto, although I'd add another item to my management plan Head in sand Fingers crossed Don't let them go flat So far its working a treat
  4. Thanks all for the offers of acid! Luckily my neighbour had some so i used that over weekend and it did a great job. The offending part was soaked overnight and came up a treat. Its now installed and the problem seems to be resolved 👍
  5. Ahh, memories. We had a good fleet of these in Napier in the late 80's early 90's when Nev Pearce was running the class. I had Frisbee. We nearly cut the boat in half when a Noelex 22 tacked on top of us off the marine parade. Dynamite downwind in 25knts +
  6. Many thanks for the offer, but I'm at Piha, the part is in my shed and the boat is at Hobsonville
  7. Yeah, ive heard that as well - unfortunately i don't have any and the white vinegar alternative isn't doing much. I really dont want to take a trip to Bunnings hence I'll try poking it clean with some wire and see how it goes.
  8. Quick update on this since a few of you are interested. I finally got down to the boat last weekend and after tearing apart the raw water cooling system, i discovered a VERY blocked up water injection mixer (see pic) that Im 99% sure is the problem. The raw water intake side of the mixer (not exhaust) is completely gunked up and will be cleaned out this week and re installed. I suspect the raw water was under such pressure due to the blockage it was forcing its way back through the rubber connector (and clamp) that seals the heat exchanger, and into the fresh water system. (not actual photos BTW)
  9. Meths has always been my starting point.
  10. I had my boat sign-written with Vinyl lettering about 10 years ago - its still lookin great. My counter stern faces north in the marina and cops the sun all day. Dark blue lettering on silver/grey.
  11. No not yet. Life keeps getting in the way. Im hoping to pop down this weekend and at least start the engine for a few minutes and take a further look. The wife and daughter are heading overseas next school hols so I'll attack it in anger then
  12. I'm not surprised and I bet a majority of it is due to inefficient, unproductive, bureaucratic red-tape.
  13. Many thanks all for the additional input - its going to be interesting to figure this one out! Touching on your comment IT "AND loss of water from header tank" whilst its loosing water from the header tank, the level doesn't seem to decrease?!?!, hence im thinking raw water is getting into the coolant as pressure builds with the revs . . . maybe Anyway, I'll start with a new cap, check impeller, then disassemble, clean, inspect and reassemble the the header tanks and exchanger to the exhaust mixer and see what reveals itself, if anything. Ah the joys.
  14. Thats exactly what some others are suggesting on another forum as someone else had the same issue. A breach somewhere in the raw water/fresh/exhaust system is causing back pressure when the revs increase. First plan of attack will be to checkout the heat exchanger and raw-water exhaust mixer and their connections
  15. Many thanks everyone for the input - much appreciated! It sound like a methodical approach starting at the cap, impeller, then check and clean the heat exchanger, check thermostat and then exhaust mixer will be the plan - fingers crossed. As an FYI, the engine was rebuilt less than 100 hours ago but has had very little over the past few years hence I'm pretty comfortable its not a head gasket, also, the water in the heat exchanger is perfectly clean, but we will see. . . . Lets hope i havent killed the engine for the second time Thanks again, I'll report back once i find some time to get into it
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