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  1. ROCK HARVEY

    Water leaking into cab

    Since I patched my floorboards and replaced the carpet, I’ve been chasing and sealing water leaks into the cab. I re-sealed my drip rails that were leaking down the pillars, and I re-sealed the cowl that was leaking next to the trans tunnel. I thought I had everything sealed, but last time it...
  2. ROCK HARVEY

    IDI to Allison adapter valuable?

    I’ve been on the lookout for a spare IDI engine to rebuild, and I came across a 7.3 out of a school bus. It had an Allison mt643 transmission behind it, and the engine still has the adapter for that transmission. Are these adapters valuable? Interestingly the engine also has a turbo exhaust...
  3. ROCK HARVEY

    ZD-29 glow plugs?

    Apparently ZD-9 glow plugs are being superseded with part # ZD-29. Has anybody bought the new ones? Do you notice any physical difference between them? ZD-9 plugs are still available, so I’m debating whether I should buy a set, or trust that the new ones will be just as good (or better?). What...
  4. ROCK HARVEY

    What is this part?

    I was getting ready to do some testing to see why my cold idle isn’t working, and I saw this small box-looking thing just behind the thermostat housing. It has 4 wires going into it, is it a relay? I’d like to know what it is because it looks semi-melted and I’d like to replace it.
  5. ROCK HARVEY

    Intake gaskets in stock

    Just wanted to let you all know that rockauto has intake gaskets in stock right now! They are listed as “wholesaler closeout” so who knows how many they actually have. Get ‘em while you can!
  6. ROCK HARVEY

    How to check motor mounts?

    Just like the title says I’d like to know if there’s any way to check whether my motor mounts are bad. I’m replacing a zf5 transmission with a cracked housing, and I’ve heard that bad motor and transmission mounts can be partly to blame. I’m putting in a new transmission mount with the...
  7. ROCK HARVEY

    4x4 zf5 output seal PSA

    Just wanted to share a lesson I learned putting a new output shaft seal in my 4x4 zf5-S42. Some brands add a lip around the seal to make sure the seal seats parallel to the bore. On my transmission this put the sealing surface in the wrong place, where the output shaft is starting to taper...
  8. ROCK HARVEY

    Running new motor oil vs waste motor oil?

    Like many others I’ve been tempted to save on fuel costs by running a waste oil mix, but I’ve never done it because the carbon in it is bad for the fuel system. But now I found a shop closing down near me that’s selling 325 gallon bulk containers of clean, new Valvoline 5w-30 motor oil for $650...
  9. ROCK HARVEY

    Zf clutch fork pivot ball

    I’m buying parts to rebuild my zf5, and I’m having a heck of a time finding a clutch fork pivot ball/stud. It’s ZF part #1307-301-011, Ford part # E7TZ 7B602A. It’s been discontinued by Ford for years. Several companies claimed to have it in stock online, but none of them actually did. Has...
  10. ROCK HARVEY

    Timing at 8.5 or 9.5 degrees BTDC?

    I have a Kent Moore timing setup on the way, so I was reading the tech article on how to to set the timing on our trucks. The article mentions how some people prefer to set their timing at 9.5* BTDC rather than 8.5. What’s the advantage to this? Does slightly advanced timing give more power, or...
  11. ROCK HARVEY

    Damage inside differential, what to do next?

    I bought my truck a couple months ago, and have been doing all the fluid changes and routine maintenance stuff. When I went to change the differential fluid, I found some strange damage inside. The cover has a deep dent from the inside, and one of the pinion teeth is chipped (pics in next post)...
  12. ROCK HARVEY

    Zf5 from a 460 truck

    I bought a non-running truck (89 f-250 4x4 5 speed) exactly 2 months ago, and have been going through the process of getting it fixed up. I got the engine running, but have only driven it a couple times for short distances. The transmission seemed loud to me, but it has a solid flywheel...
  13. ROCK HARVEY

    Make door striker bushings from PEX tube

    I apologize if this is already common knowledge, but I discovered that you can make new door striker bushings from 1/2” pex tubing. It fits tightly on the striker; I had to tap it on with a 1/2” deep socket. My doors don’t rattle anymore, and I don’t have to slam them closed anymore either...
  14. ROCK HARVEY

    New air cleaner lid?

    I decided to re-paint my rusty air cleaner housing, and when I took a wire wheel to the pitted areas I discovered that it had rusted all the way through. Does anyone know of an aftermarket lid that will fit on the stock housing? I could fill the holes with my welder, but if there’s a drop-in lid...

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