Re: [diesel_mercedes] Ludwig Rides again! Torque spec for little allen-head head bolts?

Brian:

A lot of good info collected in one spot--cool-thanks!

Is this for turbo or NA?

All I can find on the little bolts is "Tighten with a tommy handle" so that can't be very much.

I'll just snug them up until I start to get nervous.

Eric Ditwiler
Director, Academic Operations
Harvey Mudd College
909-607-3134



On Jan 23, 2008, at 7:55 AM, BStromsoe wrote:

Not sure this covers your situation but I had it available for general engine torquing on my 300D.  -  brian

TORQUE SPECIFICATIONS
ApplicationFt. Lbs. (N.m)
Cylinder Head (Hex Head Bolts) (1) (2)
Step 151 (70)
Step 266 (90)
Step 373 (100)
Cylinder Head (12-Point Head Bolts) (1) (2)
Step 130 (40)
Step 251 (70)
Step 3Tighten cyl. head bolts 1/4 turn (90°angle)
Step 4Tighten cyl. head bolts 1/4 turn (90°angle)
Rocker Arm Support Bolts29 (39)
Prechamber in Cyl. Head108-130 (157-177)
Nozzle Holder in Prechamber51-58 (69-79)
Glow Plugs36 (49)
Connecting Rod Caps
Step 128-36 (40-50)
Step 2Tighten nuts an additional 90-100°angle
Main Bearing Caps65 (88)
Crankshaft Front Hex Bolt195-239 (265-325)
Camshaft Sprocket Bolt58 (79)
(1)Setting time between steps 2 & 3 is 10 minutes.
(2)Following area the dimensions of the double hex cylinder head bolts (M 12): new = 104 max length = 105.5; new = 119 max length = 120.5; new = 144 max length = 145.0


Eric Ditwiler <Eric_Ditwiler@hmc.edu> wrote:
The rebuilt head and turbo are in my 82 300CD.

Turbo blows 13psi and tha! t is close to the upper limit of 13.25.

One remaining issue: I could never find the proper torque for the 3 little allen head head bolts and apparently did not torque them sufficiently as I have a leak between the head and the block at the back side of the little cul de sac that houses the chain. One is under the cruise control (which I am now glad I did not reinstall) and the other two are under the valve cover on the inside of the front facing portion of the head. 

Does any one know the torque for the little head bolts



brian from la verne, ca


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