Fuel rail bolts torque - Mercedes-Benz Forum
 
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post #1 of 4 (permalink) Old 05-21-2019, 12:00 AM Thread Starter
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Fuel rail bolts torque

Hi, I'm replacing fuel injectors on my friend's 97 C280 (M104.941) I can't find torque specs for the 5 bolts holding fuel rail. There is nothing in WIS on this, I only see 25 Nm for intake manifold bolts.

Is it safe to assume that fuel rail bolts would be the same 25 Nm? I don't want to over-torque and possibly bust manifold gasket.

Andrew
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post #2 of 4 (permalink) Old 05-21-2019, 05:57 AM
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If memory serves me well, those are just 6mm bolt. 25 nm would be way too much for that size. Half of that, or about 12 nm should be about right.
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post #3 of 4 (permalink) Old 05-21-2019, 10:16 AM Thread Starter
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Originally Posted by georgebuhr View Post
If memory serves me well, those are just 6mm bolt. 25 nm would be way too much for that size. Half of that, or about 12 nm should be about right.
These are M8 bolts with 6mm allen head. I had to use 7mm star shaped bolt extractor to get some of them out. I think I'll put back hex head bolts instead for easier access.

I'm not familiar with this engine but it looks like fuel rail bolts are part of intake manifold bolt pattern… which is why I don't want to over or under-torque them.

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post #4 of 4 (permalink) Old 05-22-2019, 06:01 AM
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If they are 8mm, then 25 should be ok, although a little strong. The charts say 23 nm.
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