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    Mysterious Coolant Issue 5.7L Crusader MPI

    I tried the Volvo adaptor on a Harbor Freight pressure kit, but it was too large. https://www.harborfreight.com/automotive/diagnostic-testing-scanning/compression-pressure-testers/radiator-pressure-tester-kit-63862.html
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    Coolant pressure test Kit for Crusader 5.7 MPI

    Hi Makomark, Sadly, after I told them that the Volvo adapter was too large and would not fit, they haven't gotten back to me even though I have been sending a follow-up email a day for about 4 days. I also reached out to Crusader, but I'm not sure that Contact link is still active. All we need...
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    Mysterious Coolant Issue 5.7L Crusader MPI

    How did you pressure test the engine above 75KPa? I have been looking for an adaptor to go on my Degas Bottle to replace my 75 KPA cap without success. I'm getting a leak only when under heavy load at higher RPM. Very difficult to diagnose. Pressure holds at 10 PSI under normal temperature and...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    Hi CoboJohn, I have run through the cycle many times, bringing the temp to 170 degrees, letting it cool off... I still find that everything is fine until I put a strong load on the engine. (3500RPM+ or WOT) then I lose a pint or so in short time. No water in oil, none that I can see in the...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    Hi CoboJohn, I have run through the cycle many times, bringing the temp to 170 degrees, letting it cool off... I still find that everything is fine until I put a strong load on the engine. (4000+ or WOT). I'm in contact with PMC
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    Coolant pressure test Kit for Crusader 5.7 MPI

    I did my best to get the air out of the system. Ran it for about 30 minutes under 2000 RPM, everything stable. Stopped and started multiple times, let it cool somewhat, and opened the cap. Same as before, everything is fine as long as I keep the RPM below 2000, but when I push it, even for a...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    Thanks for your reply. After some thought, the pressure cap releases from the seal, so covering the degas bottle with plastic wrap and putting the cap back on, wouldn't do anything. I understand the concept of compressed air (Spring) vs uncompressible fluid. FYI, I put the air in with a separate...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    Good to know about the 'burping' of a FWC engine. I'm definitely going to do your hot cold cycling to get rid of any air pockets in the system. As mentioned above the cap has a 75 kPa which equals about 10.8 PSI. That is about right for when it released pressure (and made a mess). What would...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    Thanks for the feedback. I would like to find the adaptor for the Crusader Degas Bottle Cap. The cap is: https://marineengineparts.com/crusader-marine-r034045-cap-degas-bottle/ Not sure what the specs are on the thread or size. Here are my details: Had a wet cylinder 6 and it was determined...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    I wish the auto places around here had the correct adapter. I couldn’t even find one online. I used Cabo-John’s idea of removing the Temp Sensor. It worked pretty well but the degas bottle cap kept releasing at 12 PSI. The system came down quickly to 10PSI and then held there loosing about a...
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    Coolant pressure test Kit for Crusader 5.7 MPI

    Anyone know of where I can get a coolant pressure test kit for a Crusader 5.7 MPI 2004? I went to a few Autopart stores, but the kits were not compatible.
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