So, after months of getting parts together, I'm replacing my radiator, belts, oil cooler hoses and the oil filter housing gaskets.

I know that the oil cooler hose flare nuts are 27mm (and that the counterpart on the oil cooler and housing is 24mm). What I'm confused about is the hex nuts that hold on the oil filter housing. I've done several searches and found conflicting information... some say 6mm hex, some say 5mm. Which is it?

Since the space is so tight, I'm planning on getting the proper hex and cutting it short (3/4 inch or so) with a dremel, putting that into the oil housing bolt then taking a ratcheting box end wrench for installation and removal. Since I've got to buy those this morning, I don't want to get the wrong one (and hey, it's Friday the 13th so I'm not feeling particularly lucky about guessing).

('84 300D with OM617)

Thanks in advance!!

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1991 300D 2.5 "Rocinante"
2002 Golf TDI "Teen Spirit"
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1984 300D
1966 Mustang I6 3sp
1985 Mazda RX-7 GSLSE
1982 Toyota Supra
1977 Datsun 280z
1971 Datsun 240z

It's 6mm allen/hex key.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.

Note for those who like to Torque things: With the Steering Box on there is not enough room to fit even a Beam Type Torqe Wrench on all of the Allen Head Bolts if using an Allen Socket.

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84 300D, 82 Volvo 244Gl Diesel

I'm gonna be quite honest, removing the steering box scares the bejeezus out of me. If I inadvertently/unknowingly botch something on the re-install, a steering failure can have dire consequences for my mortal coil.

If anyone goes searching for these bolt sizes they need to ignore the several posts over at b*nzworld that say it's 5mm.

__________________
1991 300D 2.5 "Rocinante"
2002 Golf TDI "Teen Spirit"
--------------------
1984 300D
1966 Mustang I6 3sp
1985 Mazda RX-7 GSLSE
1982 Toyota Supra
1977 Datsun 280z
1971 Datsun 240z

You do not need to take the steering box out to R&R the oil filter housing.

Using a torque wrench would be ideal, but just not the room for one. I have removed mine to replace the gasket, and just hand tightened them. they are a small diameter bolt, just hand tighten them, and tighten each one the same amount.

The torque setting is, 20 - 25 NM, or 15 - 18 FTLB

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works