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  1. ROCK HARVEY

    Has anyone ever tried maxing out cetane boost in synthetic WMO to avoid friggin' around with the timing?

    I had a few hundred gallons of Valvoline synthetic 5w-20 that I used as fuel for a couple years. I ran about 4x the usual dose of cetane booster, and also mixed it with 25-50% diesel depending on time of year. It definitely smoked a lot more than straight diesel and had less power, but I sure...
  2. ROCK HARVEY

    Noise abatement?

    Regarding door seals, make sure you buy really good ones. I bought cheaper ones on Amazon and 2 years later I still have to slam my door to close it
  3. ROCK HARVEY

    Noise abatement?

    I did a layer of 50mil butyl sound deadening mat under the carpet, but I didn’t feel like it made enough difference so I added 200mil closed cell foam on top of it. There’s still a lot of noise coming through the firewall but the sound deadening made a big difference. Also make sure you don’t...
  4. ROCK HARVEY

    Engine making a "knocking" sound and whistling from the exhaust. What things should i check?

    That whistling is interesting. I’ve heard “chirping” sounds from exhaust before that ended up being cracked exhaust manifolds, but that whistle is new to me. Have you replaced the IP or anything between the video you recorded a year ago and now? It definitely sounded smoother a year ago, and I...
  5. ROCK HARVEY

    Engine rebuild cost

    Jake_IN posted his machine shop invoice in post #21 of this thread: https://www.oilburners.net/threads/7-3-tear-down-rebuild-hydrolocked.88865/page-2 It was $3500 for parts and machining labor, but didn’t include the assembly because he put it together himself. I’m sure prices have gone up in...
  6. ROCK HARVEY

    1990 F350 RADIATOR SUPPORT 7.3IDI SUPER COOLING.

    It’s super frustrating that nobody manufactures a replacement rad support for an 87-91 diesel with A/C. I’ve been watching the classifieds near me for 2-3 years now and haven’t been able to get a good one, so if I were you I’d probably attempt a repair on that one. I’m considering buying the...
  7. ROCK HARVEY

    Original early copper brass radiators vs aluminum

    My truck came with an all-aluminum champion 3 core in it when I bought it. No issues at all, and when it’s time for a replacement I’ll buy the same one again. Actually if it springs a leak that might be a great excuse to buy a tig welder!
  8. ROCK HARVEY

    Temporary Roof Sealer Recomendations

    I would buy a tube of cheap automotive seam sealer. They usually need to be painted, but it would probably be fine for a year
  9. ROCK HARVEY

    Been a chase . Cativation etc

    A couple possibilities that I thought of: - Your oil cooler tubes might have a hole in them, causing them to mix oil and water even though you replaced the O-rings. You can pressure test the oil cooler itself to check this. - The water pump has a couple bolts that you have to seal with RTV to...
  10. ROCK HARVEY

    Injector stuck in head

    Congrats and well done! I would not have thought of making a hole saw to cut out the carbon. I’m really glad it worked out, thanks for keeping us updated.
  11. ROCK HARVEY

    Injector stuck in head

    Here’s another semi-crazy idea. What if you put the rest of the injectors back in and fired it up? The compression might shoot the stuck injector tip right out of the hole.
  12. ROCK HARVEY

    Injector stuck in head

    After you screwed in your turned-down injector, did you try tapping it with a hammer to get it moving? It shouldn’t hurt anything since the only thing holding the tip in place is carbon (no threads). What are you soaking it with? I wonder if a gun cleaning solution would be best since it will...
  13. ROCK HARVEY

    How bad is the HG job on a 7.3 IDI?

    I didn’t mess with the main seals on mine since they weren’t leaking. Here’s the videos I watched to get ready to do the head gaskets: And here’s a link to a thread where one of the members here posted a bunch of tech manuals: https://www.oilburners.net/threads/useful-pdfs.92695/
  14. ROCK HARVEY

    Injector stuck in head

    This is actually very common! My bet is that it’s not galling, but carbon buildup that has made its way past the copper washer and into the threads. If you keep trying to back it out you will end up unscrewing the top half of the injector body and the lower half will be stuck in the head...
  15. ROCK HARVEY

    High output Alternator options for 6.9 idi

    You want the long-eared 3g alternator. It’s a direct bolt-in, plus some minor wiring changes. Here’s the one on my Amazon wish list: https://a.co/d/0ewEC2qI You can get it out of many ford vehicles, but I like that this one comes with the correct pulley pre-installed. You will also need these...
  16. ROCK HARVEY

    How bad is the HG job on a 7.3 IDI?

    I did my head gaskets a little over a year ago. I didn’t pull the engine, I just used a cherry picker with a load leveler to lift and position the heads. I did call a friend to help with the install; he worked the jack on the cherry picker while I guided the heads into position. It was tight...
  17. ROCK HARVEY

    Oil squirters

    Justin from R&D has an IDI rebuild series on YouTube, and in one of them he talks about the piston squirters. He said that you can remove the press-in ones with a vice grip slide hammer, and re-install them with red locktite. Here’s the video, he talks about them around the 13 minute mark:
  18. ROCK HARVEY

    7.3 IDI Block Deck Flatness / Trueness Spec

    Here’s what my 7.3 service manual says: I know the manuals say not to deck the block, but in Justin from R&D’s block machining video on YouTube he does multiple light passes on the deck during the process of sleeving the block. I think there’s some wiggle room now with the thicker head gaskets...
  19. ROCK HARVEY

    Need advice on battery cable replacement kit

    This positive cable from Amazon fit perfect on my 89: https://a.co/d/aLn9y2d I bought 2 of these ones for the negatives, plus military-style terminals to attach to the batteries. They were longer than necessary, but work great: https://a.co/d/5U8r9tq It was 1 degree this morning and my truck...
  20. ROCK HARVEY

    Add-on overdrive options for a '90 F250 2wd 7.3 idi with ZF5?

    Are you sure your tach and speedo are reading right? I have an 89 with a zf-5, 4.10 gears and 35” tires, and 2400 rpm in 5th gear is over 80mph. 2400 rpm in 4th is closer to 65mph though. Any chance a previous owner put in 5.38 gears?
  21. ROCK HARVEY

    Oil Filter for 1993 7.3 IDI Non-Turbo....Baldwin B7039?

    I’ve been running that Baldwin filter the last two changes since the fl-1995 went up in price. No issues that I can tell, fuel pressure seems the same, etc. I run a Baldwin fuel filter as well.
  22. ROCK HARVEY

    Zf5 inspection without fully tearing down?

    What did the fluid look like? When my bearings were going bad, the fluid was really dark and burnt smelling. There is a magnet, but you have to separate the case halves to examine it.
  23. ROCK HARVEY

    Zf5 service plate replacment?

    I do remember the zf-5 service manual calling for anaerobic sealant not RTV when sealing the case halves. I think I used a Motorcraft brand product.
  24. ROCK HARVEY

    Zf5 service plate replacment?

    They do have gaskets, but like others said I’m sure RTV would work fine. If you buy one it will probably come with a gasket
  25. ROCK HARVEY

    Zf5 service plate replacment?

    Yes if you search for “zf-5 PTO cover” you’ll be able to find them. You can even buy billet ones or ones with cooling fins if you want to.

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