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6.5L Turbo Diesel 1992-00 6.5TD - Discussion forum for the 6.5L engine.

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Old 08-17-2009, 05:46 PM
jerry598 jerry598 is offline
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Default Tool for coolant drain plugs

My engine's out of the truck and I'm surprised that the threaded coolant drain plug requires some odd tool to remove it. The plug looks like it should be removed with a square 3/8" socket wrench, but my 3/8" is too big and my 1/4" is too small.

Does anybody know what tool will fit these plugs?

What I really want to do is remove the same size threaded plugs in the rear of the block in search of that spring-loaded oil cooler bypass valve. Just want to make sure that valve is functional before reassembling the engine and I figure its hidden behind one of those threaded plugs that match the coolant drain plugs.

The oil filter bypass valve was easy to check. With the filter adapter removed from the block it was easily accessible.
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Black 95 6.5 turbo K3500, 929 block, 126k miles, 3500 miles now on done it myself rebuild, 6 L&S Full-torque inserts in the outer main crank bolt holes, Fluidamper, rebuilt NV4500, IP replaced under warranty, new injectors, glow plugs, 3" downpipe, 4" exhaust, no cat, dual 195 degree Tstats, 9 blade fan, 180 degree fan clutch, PMD relocated behind front bumper, OPS relay mod installed, black running boards matching the black paint.
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Old 08-18-2009, 09:40 AM
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john8662 john8662 is offline
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The valve you're referring to should have been removed during hot-tank and vatting.

The valve will be underneath a cup plug in the oil filter boss. The plug in question will be a 7/8" Diameter plug with a .060" hole drilled into it. Underneath that plug lies the oil cooler bypass valve.

No threaded plugs to remove to see that guy. Removing the plug mentioned above requires a threaded fitting on a slide hammer to remove. Yes, a pain...

J
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