I am replacing the timing chain using the special tool and need to retorque the front two head bolts that are used to hold down the tool. Can anyone give me the torque?

Thanks

Lee

What special too are you referring to?

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.

The tool cost $60 or so, and bolts over the cam sprocket. It has low clearance between the tool and the chain so the chain can not jump the sprocket. This gets you away from the vice grip thing.

The tool also have a cut out in the middle where you feed the new chain in and the old chain out.

Sorry. I do not have a camera handy. Will post a picture tomorrow.

I've used that tool on my two engines and it makes chain replacement almost idiot-proof (well, I was sucessful).

The manual says 50nm (mult by ~0.75 for ft-lb) for the M8 bolts (I think those front two are). I go back and forth slowly between the two and get up to the final value. You do not want to "screw" this up. Double-check your torque wrench and make sure you are looking on the right side of it whil adjusting if you have dual metric/english markings. There would be no worse feeling in the world to find the torque suddenly getting easier as you approach the final value. Tap (tap only) the top of the bearing with a rubber mallet as you go to relieve stress.

The bolt heads and washers should be lubricated and the threads clean but not "dry", and make sure that nothing has gotten under between the bearing and the head. It doesn't take much to bind the camshaft (replaced one of those too, and it was touchy, getting the bearings all in line while tightening).

__________________
86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm

60 Nm Per All Data For A 560sel (1987)

John

Wait

I cannot find a torque specification for these bolts in the manual. My CD gives me 60 Nm for the large 10mm head bolts these 8mm bolts are not specified. Therefore I would use standard bolt torque for these of 16 Ft-Lb. Same with the intake manifold, also not specified. I belive I used 20 ft-lb when I did mine based on another engines 5/16" bolt torque.

Strife where did you find 50Nm

See attached bolt torque table.

John Roncallo

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On this page of the 107 shop manual CD:, involving cam replacement:

\program\Engine\107\M117_56\05-220.pdf

I'm pretty sure that this is correct because this is one area in which I would DEFINITELY make certain not to give bad advice

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__________________
86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm

OK I found that but I'm not sure if its a misprint. I thought both cam bearing bolts were 10 mm. And if I recall only 1 of them was a head bolt and the other was only into the head. In the text it refers to 1 of them as a 10mm and the other as an 8mm. But then further in the chapter it shows a breakdown and refers to both at 10 mm.

Also I thought the chain loader picked up on the small 8mm bolts that go into the timing cover shown in the picture of the gasket set. I've never used one.

In any case 50 Nm sound like allot for an 8mm bolt into an aluminum head can anyone clear this up.

John Roncallo

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No, the cover definitely goes over the cam bearing and uses its fastening bolts.

This is a little confusing, though. Now I don't know what to think. But I'm pretty sure I got them to 50nm slowly and carefully with no "unfortunate incident", and nothing has rattled loose yet. It's pretty scary doing this when an apparent minor screwup means a heads-off job.

__________________
86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm

Lee if you think your confused. I'm really confused. But maybe you can help. The bolts you are talking about ate they 8mm to 10mm. Or is one 8mm and the other 10mm.

I would hesitate to put 50 or 60 Nm to an 8mm bolt.

John Roncallo.