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Recent content by CaboJohn

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    Coolant pressure test Kit for Crusader 5.7 MPI

    I am confused. I really don't understand the problem (if there is one) and don't understand the tests you did or the concern over the pressure in the system (you tested and it looked fine). When I suggested operating through multiple heat/cool cycles to determine if the system really had a...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    I suspect your last comment crossed my last post somewhere in the ether and you wrote before reading the pressure/air bubble discussion. But in answer to your query about plugging the exit and going to 18 psi, if you still have a large bubble in the system you might sneak up on that pressure...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    Ditto on Mark's comments. When the engine heats up and the coolant expands, if it is truly full (no air bubbles), the pressure rises very quickly (liquid is not compressible although the hoses will expand a little), the pressure cap will open and the excess goes into your overflow reservoir...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    I have sold my 5.7, but as I recall that the pressure cap is supposed to maintain 7 psi so it sounds like you are doing fine. You should check your specs. If you shared your thinking on why you may have a problem then perhaps you could get some better suggestions. The key to making this system...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    I removed the temp sensor from the top left of the intake manifold (a pipe thead, either 1/4 or 1/8 - don't remember) and replaced with a $10 pressure gage. Did my tests at the dock. It is accurate, foolproof and cheap. Cabojohn
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    2000 Crusader 5.7 MPI - Parts Help - Oil Cooler and Heat Exchanger

    I hope you have made progress, but if your problem was coolant (antifreeze) in the oil, unfortunately neither of the exchangers you mention have the opportunity for that to happen. Both use raw water to remove heat from the other fluid (be it oil or coolant) and both use raw water at much lower...
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    Correct spark plug gap

    I have 2003 Captains Choice MPI 350s. Manual says the correct gap is .060. Recently I ran across several posts on Hull Truth where owners were saying the correct gap is .035 or in some cases they said .040 or .045. The argument made was that the engine has known problems with cross firing due...
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    Getting closer on the coolant leak

    Boat has been sitting dry for several months. I came down to find the ongoing coolant leak, which, as discussed in previous posts, I thought for sure would be the heat exchanger. Pressure tested the system, very slowly lost pressure but nothing seemed to be happening in the heat exchanger...
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    Heat Exchanger Repair

    I have twin 2002 Captain's choice 5.7 engines. The port side has had the “missing coolant” symptom for a year or more that has varied in intensity but is getting worse. Nothing in the bilge or oil. I will return to the boat (in Mexico) next month to attempt a repair. I have some new stuff...
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    Leakdown test on a 5.7

    5.7 with Hurth ZF. What is the best way to prevent the engine from turning over when performing a leak down test?
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    Lost another raw water pump

    I have twin 2003 Captains Choice 5.7. Raw water pumps are crank mounted Sherwood P-105. They used to last quite a number of years but lately I seem lucky to see two years of service...less than 200 hours. Failure mode is always a salt water drip at the shaft seal. I saw today the starboard...
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    Strange mystery noise in a 5.7

    Hi Guys, Arrived in Mexico for the season last week. Boat partner had already splashed the boat, checked fluids and started both engines. (2002 5.7 Captains Choice with around 950 hours each) He was anxious to fish so we went tuna fishing the next day. After several hours we noted a loud...
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    Correct screws for 5.7 water pump

    I need new socket head cap screws (3/8-24-1 1/4) to attach the P105 water pump to the hamonic balancer. I believe the original screws are black oxide coated and they have rusted terribly (inside the socket head, the threads are fine) The failure mode on these pumps is usually a leaky seal...
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    5.7 oil cooler changeout

    Engines are 2002 5.7 Captain's Choice. I am changing out the oil coolers as preventative maintenance as they are now 15 years old. The engines use the dual (straight though) oil cooler, R147035. Access is terrible so I have been waiting until it was time to do elbows so that I could also take...
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    5.7 MPI injector question

    In my last post I was advised to check the wiring on the injectors. Looking at the wiring diagrams in the Diagnostic Manual I realize I don't really understand how these things work. I appears that all injectors have a terminal connected to a hot source when the ignition is on (same one that...
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