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Torquing D15 Head Bolts

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modirt View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote modirt Quote  Post ReplyReply Direct Link To This Post Topic: Torquing D15 Head Bolts
    Posted: 01 May 2023 at 4:16pm
On Series II with 160 engine, manual says to torque them all to 80 to 85 foot pounds. All 12 of them. Except all the bolts are not the same size or spacing.

On right side of engine, there are fewer and larger bolts. Does anyone torque those more? If so, how much.
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steve(ill) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2023 at 5:10pm
the 1/2 inch bolts can go close to 80.... the 7/16 bolts are more like 60.


here is a reference... head bolts are similar to grade 8..




Edited by steve(ill) - 01 May 2023 at 5:14pm
Like them all, but love the "B"s.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ChillyB Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2023 at 8:57pm
What a fastener can accept before yield is not the point with head bolts. What matters is even tension. Bolt tension is a function of torque for a given thread pitch regardless of size.

I don't know the thread pitch for your bolts. My first year D14 has all 7/16 bolts. My recommendation is to torque all bolts the same. The difference between tension on a 7/16-14 vs 1/2-13 probably isnt much if torqued to same value.

I torqued my head to 60 ft-lb and had water in oil. Pulled to 65 ft-lb and no more problems. For what it's worth. And I used new grade 8 bolts, which could have accepted more torque but that is no reason to actually pull them that hard.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote modirt Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2023 at 7:09am
This D15 has 7 - 7/16 bolts down left side, and 5 - 1/2 bolts down right side.

The goal was to get compression of head gasket even. D15 manual says to do them all to 80 to 85 foot pounds. Somewhere I seem to recall there is another Allis engine with two sizes of head bolts and they had different torque specs. More for the larger ones.

If doing them even is what works, then that is good enough for me.


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