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    Fuel Pressure Question

    Pressure is resistance to flow. When pressure is high, the engine isn't using all the fuel being supplied. When pressure is low, the engine is using most or all the fuel being supplied. In other words, low pressure does not necessarily indicate low flow.
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    last shot with this truck, OIL STILL IN COOLANT

    To my mind, the oil cooler and related are really the only place a mix like this can happen. This might be a time to build and use that oil cooler pressure test fixture outlined in the manual. There might be a place in the block where a crack could cause something like this, but never heard of...
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    Questions about Porting heads

    Yeah, it's quite a lot of work and if you pay someone to do it, it's very costly because it's quite a lot of work. Benefits are negligible in a turbo and middling with a NA. Benefits there but not in comparison to the cost/effort.
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    to grease or not to grease, that is the question

    Sometimes rust is just rust but in an area that is free of oil, it needs some protection from wear and corrosion and some grease does that. If, after you clean off the rust, the splines are tight, and you see no obvious wear, no worries. Lube it up and stab it!
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    Well that's a new one - oil in lense of oil pressure gauge

    Years ago, i had a mechanical OP gauge in my little triple gauge pod. It was a SW, the old good style, but anything can fail. Anyway, I'm on a trip and begin to smell a hot oil smell. Shortly I look down and see oil running down the face of the radio (my gauge pod was located above the radio)...
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    to grease or not to grease, that is the question

    I'm with Towcat. Brinneling or "fretting" between splines is a very real problem in some cases. There is a t-case out there... I don't remember which and I'm too lazy to research it... that is notorious for this problem and eventually the splines wear out and you start actually getting a clunk...
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    Fuel Sending Units

    Is the sender bad or did the float just sink? Had the same trouble last year and it was the float. Don't buy the one from LMC truck, however. It says it fits but it's slightly different. Can be made to work by tweaking the arm, but that's not optimal. I measured the old one and found one on eBay...
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    86 f250 6.9 rebuild/refresh advice and questions

    The top piece of your grill looks a little tweaked and could use some adjustment. After that, clean it up and repaint the area semi-gloss black and you won't notice it.
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    U Joint How to?

    I spent 21 years wrenching professionally, not to mention 24 more years as a die-hard do-it-myself gear head and while I didn't keep count of how many u-joints I have replaced, I'll bet I'd be in the top five or better on this board for how many I've done. I don't make that statement to...
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    86 f250 6.9 rebuild/refresh advice and questions

    Happy break-in!
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    Intake filtration ,?101?

    OK I moved all this stuff to a new post and cleaned it up a little. All I had time to do, as I'm on a big deadline. From here, ask specific questions and I'll answer as best I can. Oiled Cotten Gauze vs Cellulose ("Paper") vs Synthetic Oil cotton gauze filter come with many brand names, K&N...
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    TO THE PEOPLE RUNNING SPECTRUM STYLE AIR FILTERS......

    I'm still here, so if some wants to talk more, put this into another thread or start a new one, either is OK by me.
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    TO THE PEOPLE RUNNING SPECTRUM STYLE AIR FILTERS......

    Where to start here... how about definitions : 1) No, you are incorrect, it's not "paper" it's a cellulose material that is more accurately called cellulose fiber. There are many products made from cellulose or wood pulp. Certain paints have wood pulp in them: are they "paper?" Chewing gum has...
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    TO THE PEOPLE RUNNING SPECTRUM STYLE AIR FILTERS......

    Methinks you need to do more research or you won't make such broad statements. "Paper Filters:" To start, incorrect terminology. They are made up of cellulose fibers, usually from wood pulp. A cellulose filter uses a resin treatment to bind the fibers into a rigid structure after it's pleated...
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    TO THE PEOPLE RUNNING SPECTRUM STYLE AIR FILTERS......

    Marmot: Clean air is important but changing filters at 9K, without justification such as an extremely dirty environment or a restriction gauge indicator, is a big waste of your money and absolutely no benefit to your engine. If you read the attached article, there is a great statistic from Jon...
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    TO THE PEOPLE RUNNING SPECTRUM STYLE AIR FILTERS......

    The only thing with lower filtering efficiency than a one or two-ply oiled cotton gauze filter is a cheap-ass, china-made oiled cotton gauze filter. Oiled cotton gauze is a leftover from the days in the '60s and early '70s when extremely restrictive oil bath and waxed paper air filters...
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    Is there an oil bath air filter that will function with an idi?

    If you want the worst possible airflow capacity combined with the lowest possible filtering efficiency, by all means go with an oil bath air filter. There were many good reasons why they disappeared very rapidly from the automotive landscape. I did a lot of research on them for a story I did on...
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    Mag-hytec diff cover

    Yeah, that's me! Can't believe that is still up.
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    Mag-hytec diff cover

    If you look closely, you will see that at the normal level, the oil doesn't really go up the axle tubes. When you turn and such, oil flows out and back but the tubes out to the bearing reservoirs are not laying in oil. By increasing the oil level (3/4 inch I think), there is about a quarter inch...
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    Mag-hytec diff cover

    Mag-Hytec makes some compelling points about the choice of oil level, the main one being that the axle bearings are kept better lubricated and cooled. In reality, if you end up with a leak at what is really only a slightly higher oil level, you probably had a leak waiting to happen anyway. I...
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    7.3 idi with c6 trans.

    Gee, what gears does this truck have? What tire size? 4.10:1 was the lowest factory gear ratio and 2.35/85R16 was the tire size (about a 32). My truck is a C6 with 4.10:1 and even with the shorter original tires (it has 33s now) it would do 80mph flat out before the governor kicked in at 3300 or...
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    GP light: On once this morning, that's it... Need her today. Not the time!

    Better to adjust your, "to plug or not to plug" to 30 degrees, not 15F. They like it better and it's better for the truck long term to start warm. Weak batteries effect you in the crank and the glow departments. You need full amperage to get the most heat out of the glow plugs. I would do three...
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    Still having starting problems

    You have a couple of known problems. Fix those. THEN diagnose farther.
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    I got 16.29 mpg!!

    Obligatory content comment: Atta Boy Old geezer reminiscing comment: Love Julian back in the day. In one of my past lives I worked as a mechanic on the Anza Borrego Desert State Park and lived on the W-W Ranch off the Grapevine Trail near Ranchita. In many ways, some of the best times in my life!
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    Electric Lift Pump (Holley?) correct part?

    Do you guys all have single tanks? If you have a pusher style electric pump and want to have it close to the tank for best results and longevity, do you install two pumps, one at each tank, with a relay that switches over when you switch tanks? Or are you installing it at the main line out from...

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