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Thread: Engine knocking LDS-456

  1. #11
    4 Star General cattlerepairman's Avatar
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    Start, let idle, check manifold at each cylinder, back and forth. You will see the temps rising at each cylinder - unless it is not firing. At those, the manifold will stay noticeably cooler. It will all warm up somewhat but it will not get the same heat as with an operating cylinder.
    I would not drive the truck until the issue (or issueS) is/are identified, simply to avoid unnecessary wear and tear on bearings and moving parts.
    MVPA member. 1974 M35A2C w/w "Queen Lola", rebuilt LDS-465-1A, "D" turbo, Waterloo Overdrive upgrade. Med towbar, 11.00R20 Goodyear G286, flipped hubs, remote brake fluid reservoir, spin-on filters, bypassed FDC, LED taillights, LED headlights, LED turn signals, WESTACH EGT/boost gauge, AVM lockout hubs, LED convoy light, LED lollipop lights, HMMWV seat on air ride base, M211 dash passenger grab handle, hood lift kit, 24V solargizer/battery minder, ether start kit, flasher module mod, heavy duty dog bone ends, M35A3 aluminium fuel tank.

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    Colonel Oerthedge21's Avatar
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    Ok so I'm looking for a cylinder that's cooler than the rest. Will do, I'll report my findings/test results later today

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    4 Star General Jeepsinker's Avatar
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    You need to change your hydraulic head o-rings and probably the boost pump seal too. Need to stop the fuel in oil contamination first and foremost, then move forward. Running it with fuel in the oil is hard on bearings and cylinders even if not under a load.
    I sink Jeeps... That is all
    1969 Kaiser Jeep M35a2 w/winch (Daily driver, no joke)
    Now a hot rod deuce: 6BT swap in progress, Waterloo overdrive, 2 micron fuel filtration installed, riding on 11.00r20s
    1971 M151A2 w/ ROPS
    3: 87' M35a2c Air Force trucks
    1991 BMY M936a2 wrecker
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    1: Fresh rebuilt and load tested good Mep003a genset
    I do Fort Polk and other recoveries in my state. I can be reached at 337-401-2470

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    4 Star General Jeepsinker's Avatar
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    I sink Jeeps... That is all
    1969 Kaiser Jeep M35a2 w/winch (Daily driver, no joke)
    Now a hot rod deuce: 6BT swap in progress, Waterloo overdrive, 2 micron fuel filtration installed, riding on 11.00r20s
    1971 M151A2 w/ ROPS
    3: 87' M35a2c Air Force trucks
    1991 BMY M936a2 wrecker
    2: M1061 flat trailers
    1: Fresh rebuilt and load tested good Mep003a genset
    I do Fort Polk and other recoveries in my state. I can be reached at 337-401-2470

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    Colonel Oerthedge21's Avatar
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    So you think it's coming from the IP then? And I know, I drive it as little as possible but I have to get to work and this truck is all I have right now. I'm in the process of picking up a car this weekend, but until hen sadly I have no choice.
    Last edited by Oerthedge21; 08-16-2019 at 14:32.

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    Modertator swbradley1's Avatar
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    Quote Originally Posted by frank8003 View Post
    Duh on me, I never even thought about equal length and why but that is why some line are looped around a few times. And the multiple bracket fuel line keepers need to be there. Thanks.
    Attachment 773400

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    4 Star General Jeepsinker's Avatar
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    Quote Originally Posted by Oerthedge21 View Post
    So you think it's coming from the IP then? And I know, I drive it as little as possible but I have to get to work and this truck is all I have right now. I'm in the process of picking up a cat this weekend, but until hen sadly I have no choice.
    Absolutely coming from the injection pump. Replace the hydraulic head o-rings and the boost pump drive seal and you'll be good to go until something else breaks.

    Your knocks could be cylinder liners that are coming apart. That's what happened to my LDS465-1A, which is why I've spent so much effort installing a Cummins.

    I surmise that the cause of many windowed blocks is actually the bottom of the liner shattering, catching the piston, and then blowing the rod out the side. Mine didn't window the block because it locked when I was starting it and it hadn't even reached idle speed.
    I sink Jeeps... That is all
    1969 Kaiser Jeep M35a2 w/winch (Daily driver, no joke)
    Now a hot rod deuce: 6BT swap in progress, Waterloo overdrive, 2 micron fuel filtration installed, riding on 11.00r20s
    1971 M151A2 w/ ROPS
    3: 87' M35a2c Air Force trucks
    1991 BMY M936a2 wrecker
    2: M1061 flat trailers
    1: Fresh rebuilt and load tested good Mep003a genset
    I do Fort Polk and other recoveries in my state. I can be reached at 337-401-2470

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    Colonel Oerthedge21's Avatar
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    I guess I'll order up the IP seals then. I'm gonna do the exhaust manifold test before I leave work today anyway since we have one of those IR thermometers here. Hopefully they come out similair and the HH is what's giving me all the trouble

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    Colonel Oerthedge21's Avatar
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    It's quiet from the engine bay, much more noticeable in the cab.


    I pulled the fill cap while it was running, engine hot, and the smoke does puff out, if you out your hand over the hole you can feel the gasses pulsing out which I'm pretty sure is a bad sign.
    Last edited by Oerthedge21; 08-16-2019 at 16:12.

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    4 Star General Jeepsinker's Avatar
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    Yup. Start looking for an engine or planning a swap. You have damaged pistons and/ or liners. These engines really aren't worth the cost to overhaul anymore for their average lifespan ( 40-50K miles)
    I sink Jeeps... That is all
    1969 Kaiser Jeep M35a2 w/winch (Daily driver, no joke)
    Now a hot rod deuce: 6BT swap in progress, Waterloo overdrive, 2 micron fuel filtration installed, riding on 11.00r20s
    1971 M151A2 w/ ROPS
    3: 87' M35a2c Air Force trucks
    1991 BMY M936a2 wrecker
    2: M1061 flat trailers
    1: Fresh rebuilt and load tested good Mep003a genset
    I do Fort Polk and other recoveries in my state. I can be reached at 337-401-2470

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