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Thread: M818 Turbo Addition

  1. #21
    Sergeant Major Lonnie's Avatar
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    Yes, but unfortunately it is almost impossible to see with the turbo & exhaust in place.

    The turbo outlet points straight down, then a 90 deg silicone coupler facing the rear,
    a 3.5" tube to a 90 deg coupler between cab & belle housing,
    Turbo outlet.jpg

    to a 45 deg coupler on top of belle housing, which I could not get a picture of,
    then to a 90 deg coupler transitioning to a 4" at the dr. side.
    Intake.jpg
    From there a 4" tube to a 90 deg transition at the 5" intake manifold.

    All the couplers over the belle housing were connected with small pieces of tubing approx 4-5 " long.

    It is a very tight fit back there but it clears nicely & allowed me to have room for Jakes on top of the engine.
    Last edited by Lonnie; 10-08-2019 at 09:50.
    1972 AM General, Turbocharged M818 w/ Deuce Bed & 16.00's

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  3. #22
    Colonel US6x4's Avatar
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    I like how simple the entry into the intake is with that routing. I too am eventually going to run a turbo with jakes so this routing is on my mind lately.

  4. #23
    Sergeant Major Lonnie's Avatar
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    It was a rather simple install.
    I've built a lot of custom turbo/supercharger tubing for cars... this was easy compared to fitting 3.5" pressure tubing & a 4" intake in a Camaro.

    Be sure to get aluminized steel or aluminum tubing so it doesn't rust on the inside.
    1972 AM General, Turbocharged M818 w/ Deuce Bed & 16.00's

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    Colonel US6x4's Avatar
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    Do you have to roll a bead on the pipe ends or are the hoses just clamped over smooth pipe?
    Last edited by US6x4; 10-15-2019 at 12:01. Reason: to make the grammar more gooder

  7. #25
    I'm the dude, man! Steel Soldiers Vendor simp5782's Avatar
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    Quote Originally Posted by US6x4 View Post
    Do you have to roll a bead on the pipe ends or is are the hoses just clamped over smooth pipe?
    You have to have a bead otherwise they will blow off. Use spring loaded t bolt clamps only
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  9. #26
    Sergeant Major Lonnie's Avatar
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    On oval pipe, I always use a bead, but I have had good luck with regular t-bolt clamps on just smooth pipes.

    You can carefully flare the end by using a small crescent wrench tweaking the last 1/4" of pipe out slightly. It does not take much & you don't want to see a lump in the hose... At the low boost we are running on these trucks, it isn't typically a problem.
    1972 AM General, Turbocharged M818 w/ Deuce Bed & 16.00's

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  11. #27
    Sergeant Major Lonnie's Avatar
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    Started the Jake install today.

    Before Paint...
    Jake.jpg

    Painted & Installed

    IMG_3165 small.jpg

    It went pretty well....

    Here is a link to the Jake install manual:
    https://parts.jacobsvehiclesystems.c...0E-and-25B.pdf
    It tells you how to install, set clearances etc.

    I swapped my parts without removing the rocker box. This kept me from breaking any gaskets etc.
    It is rather easy:
    1. Replace 1 rocker box bolt at a time with a stud & nut, then torque to specs & repeat 11 more times.
    2. Line up the timing marks as you would to set the valves.
    3. Remove the adjuster screw from the exhaust rocker & pivot the rocker out of the way in order to change the exhaust cross head.
    4. Replace & adjust cross head for clearance.
    5. Replace adjuster & adjust the exhaust valve clearance.
    6. Unscrew the injector adjuster & replace it with the special hex adjuster provided with the Jake Brake.
    7. Adjust the injector.
    8. Finally check and adjust the intake valve clearance.
    9. Move to the next cylinder...

    My biggest issue was the injector adjustment. Having never done this before, I was paranoid & wanted to be sure my torque wrench was accurate. I carefully checked the existing preload to see where they were so I was sure I was doing it properly.
    They were all fortunately within spec & returned to the specified torque.

    I then installed the Jakes & torqued them down.
    Loosen the Jake exhaust set screws & reset the clearance to .018" following the same cylinder rotation sequence as you used to set the valves.

    Before putting the rocker covers on, I started the engine & bled the solenoids.
    Once the got the air out, you could push a solenoid plunger & hear the engine sputter.

    Now for the wiring...
    Last edited by Lonnie; 10-12-2019 at 21:50.
    1972 AM General, Turbocharged M818 w/ Deuce Bed & 16.00's

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  13. #28
    4 Star General 74M35A2's Avatar
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    Nice work, clean install. Thanks for posting details and answering questions.
    CFO @ Portacharger

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  15. #29
    Colonel US6x4's Avatar
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    Lonnie, how tall is a 25B jake head?

  16. #30
    Sergeant Major Lonnie's Avatar
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    Sorry... I forgot to get back to you.

    Mine measure 2-1/4" tall.
    1972 AM General, Turbocharged M818 w/ Deuce Bed & 16.00's

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