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  1. Wrenchmonkey316

    6.9/7.3 cooling system additive

    I need the additive that helps prevent cavitation. What does the bottle look like? Does anyone know where to get it.
  2. Wrenchmonkey316

    C6 overheating mysterious cause

    I’m upgrading the transmission cooling system because it seems to be what is causing the overheating issue. When I took it to the diesel shop the radiator shop and the transmission shop they all said the transmission, radiator and engine are great. I’ve done a compression test, timing, fan...
  3. Wrenchmonkey316

    Getting ready to install my c6 cooling upgrades

    I ordered and received the deep pan and rapid cooler y’all recommended. I have a small aux cooler already existing in front of the ac condenser so I was hoping I could mount the new rapid cooler one in-line right below the existing one to make the total surface area of both trans coolers about...
  4. Wrenchmonkey316

    The rear tank doesn’t like to take fuel

    When I try to fill the rear tank it acts like it’s full. If you pump extremely slow it’ll fill but who wants stand there holding the lever in the the barely pumping position for about 30 minutes. Is there an obstruction or one-way flap that can potentially become an issue? Is there a vent that...
  5. Wrenchmonkey316

    What years f250 idi diesels had limited slip?

    Mine is an 88 2wd
  6. Wrenchmonkey316

    Anyone done a large aux c6 trans cooler?

    I’m wondering if anyone has installed a aux transmission cooler on a 7.3idi with a c6 and AC. Mines an 88. 2wd.
  7. Wrenchmonkey316

    7.3 idi compression test results

    130k miles. Clean truck. I’m losing a bunch of oil.. 4 quarts at 500 miles. So I had a compression test done. I’m wondering if this is enough loss to be concerned about? The truck rocks at idle so running kinda rough, could the compression issue I have cause it? All input is appreciated!
  8. Wrenchmonkey316

    7.3 idi overheated and the c6 started to drip.

    I just bought a fan clutch yesterday evening but it’s still sitting in the box. I had to make a 1 hour steady uphill hwy trip to do a waterfall repair job this morning and it got hot (MArange) on me when I looked away from the gauge for a second. When I pulled over to cool down and take look at...
  9. Wrenchmonkey316

    Could you Sleeve down an old crusty 7.3 to run 6.9 pistons???

    I’m curious if you could possibly do a swap from a 7.3 piston down to a 6.9 and swap to the normal 6.9 gaskets and everything still all line up? Do the heads need to be swapped? Or anything else? Is it possible? Difficult? Easy? Has anyone heard of it being done? Thank you. All of your input is...
  10. Wrenchmonkey316

    A have a few ugly injectors. Need help diagnosing appearance/causes.

    I took pictures of the old 7.3 idi injectors. I’m hoping to get some information based on the appearance of these injectors. All input is appreciated. Thank you.
  11. Wrenchmonkey316

    What is the going rate, reman 6.9/7.3 engine replacement and an injection pump

    I’m wondering about how much I will spend total for a reman engine and injection pump for a 6.9/7.3 parts only, not labor. Thank you for your input. Not that I’m needing anything now, I’m just curious about it.
  12. Wrenchmonkey316

    Wet Black spray on ground at cold start hard throttle.

    Was doing a comparison test on the engine running at 2k cold to compare timing of two 7.3 non turbo idi’s. When I hit the throttle my son said come look at this and I saw a wet black spray patch like a giant spray paint can shot the ground from the exhaust pipe. Is this normal?
  13. Wrenchmonkey316

    Blue smoker. Seems like it’s tough to narrow down.

    I have a 1988 f250 idi and it blows some blue clouds when you step on it a little bit. Clean truck, appears to have been taken care of pretty well. Lower mileage 121000. Hoping to come up with a list of things to try in order from easiest to most difficult. All input will be appreciated.
  14. Wrenchmonkey316

    Check engine light at start up only. Stays on for a few extra seconds sometimes.

    I have a 1988 f250 7.3 idi. The dash engine light comes on at start and takes a few seconds to shut off. Sometimes it even takes an extra 20-30 seconds or so to shut off. Any thoughts? All your input will be appreciated.

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