Angry d24t coolant pressure issue
So I dot a d24t running that had been parked for a bit
Changed fluids and regular stuff Was getting warm on short drives around the block Never past 3/4 on gauge Parked it changed thermostat and fuel filter water separator Now it's grumpy and doesn't want to start Seems like it's leaking from all of the small return lines from the injectors Could my return line be plugged and be flooding it out ? Seems to be pressurizing coolant Maybe bad head gasket? |
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Hard starting sticky. Quote:
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What size are the small fuel lines between injectors Most are leaking so I'll start there |
Forum member Anders uses 1/8" fuel line. Likely the easiest to procure at your FLAPS.
Original was the braided type. If that's what you have, and it's leaking only at the ends where it connects to the injector nipples, you can often get some more time out of them by cutting the (stretched-out) ends off and refitting them. That braided hose is durable and widely available at Bosch service centers, or from VW parts websites. An interesting replacement is ether-based polyurethane clear fuel hose (found in motorcycle shops, and trucking equipment shops). Very good, without the braiding reinforcement. That's ether-based, NOT the ester-based version. Since it's clear it can help with troubleshooting. Again, 1/8" or its metric equivalent. |
Sweet
And yes mine is braided and the braiding is loose and tattered looks original I'll order some clear lines up! Thanks |
When you say you changed some fluids, did you have the coolant out of it?
Did you get all the air out before starting it? These will not burp simply by filling the rad up, you need to remove the hose from the top of the cold start advance thermostat housing and slowly fill until coolant runs out. Running with an air pocket will get one of these hot quickly and the HG is sensitive. |
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It was low but looked good I just topped it off Where can I find some directions on a proper flush once the thermostat arrives |
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The thermostat housing likes to seep on some older models where electrolysis has taken it's toll on some of the narrower mating surfaces; a little coolant safe rtv might help there. Mine seems to seep a little intermittently past the o-ring. |
No power at glow plugs
so I had a couple min to check stuff out other than the fuel lines I was checking some electrical and found no power to glow plugs on cranking
It's 70 degrees here but I figure there should be power at least at cranking There is also an extra electric inline fuel pump pulling from the tank It is cool nbected to a bus bar I disconnected it and it works with direct power If I jumper to the glow plugs with my aligator clips it instantly blows my In line fuse (30 amp ) So o am assuming there is some powering up issue Sorry for all my possibly dumb questions but I've got much learning to do |
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I'm assuming the glow plugs get power from the big square relay What triggers this relay ? Also where might I be getting a short circuit at the glow plugs? My wiring is a little strange as the car was a prv Swapped with h a d24t from a 760 with some components from d24 240 also |
GP relay triggered by the temp sensor screwed into the rear of the head, hiding under the rear cam cogged gear that drives the IP belt. Actually located more inbetween the cam gear and the IP rather than directly under the cam gear. Disconnecting the temp sensor should fool the relay into giving max GP time.
Hard Starting sticky, specifically the Glow Plug Section More on GP testing |
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Short circuit could be a shorted plug, or the glow plug bus insulation missing somewhere and touching something. The plugs draw 12+ amps each though, so if you're concerned there's a short because it blew a 30A fuse while testing it, that would be normal. Do a visual check for shorted bus or supply wire, and if OK, start checking the rest of the system out. |
Got it
Replaced return lines from injectors
Burped the cooling system Checked for shorts found none Pressurized the tank and forced fuel untill the return was free of bubbles Charged battery and jumped with another car and after a bit of cranking 4-5 cranks 15-20 sec each it fired and now starts easy Thanks for the help ! |
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