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Head bolt torque WD45 fine VS course

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Steve M C/IL View Drop Down
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    Posted: 02 Dec 2010 at 10:20am
So what is correct when torqueing head bolts when 4 water manifold studs are fine thd and the other bolts are coarse thd not to mention that 3 are shorter that the rest? In the theory world the fine thd nuts would be different than the coarse thd capscrews and the shorter capscrews would be different than the long ones to achieve equal clamping force.Don't even mention the nut under the thermostat hsg which I can only get a box end wrench on.I'm guessing that "close" is good enough since I've not seen this addressed on here before.
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niel ev View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote niel ev Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2010 at 10:47am
Steve I could be wrong but since the D17 has a simular head and block to a wd45 the torque on it is shaft support3/8 25-30 ft lbs nut rocker arm cover 3/8 10-15 ft lbs head to block1/2 90 -95 and 7/16 70 -75 and manifold to head 7/16 35 -40 ft lbs can't find anything on wd45 hope this is some help Niel
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Steve M C/IL View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve M C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2010 at 2:04pm
Thanks Niel.Now that makes another problem.My head bolts/studs are 1/2in..Only have a WD factory service manual and a I&T(joke)WC- WD-WD45 manual which both say 70ft/lb on bolts and 25 on the 3-3/8 studs.
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HagerAC View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HagerAC Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2010 at 3:28pm
In my Allis Repair book(bible) it says 90 ft. lbs on the 1/2 in bolts and 25 on the 3/8 bolts.  I just recently put a head on a WD-45 so I still remember the numbers.  The book is an old A-C shop service book which ranges from the WC to the early D-17's, so I am pretty faithful in the information in there.
21 A-Cs ranging from a 1928 20-35, to a 1969 180D.
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Brian Jasper co. Ia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2010 at 4:45pm
The O.E. A-C shop manual for the D17 says to torque the 1/2" cap screws and studs 90-95 ft lbs. Torque the three 7/16" capscrews 70-75 ft lbs. There is no mention of any 3/8" bolts or studs. Can't say for sure if the WD45 226 is the same though.
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HagerAC View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HagerAC Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2010 at 6:26pm
There are three 3/8" fine thread studs in the block on the WD-45, and i'm pretty sure my D-17 was the same way.  Newer D-17's may be 7/16, idk.
21 A-Cs ranging from a 1928 20-35, to a 1969 180D.
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Steve M C/IL View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve M C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2010 at 10:10pm

A little birdy told me that D17's have GR8 bolts.The few that are marked on my 45 are GR5. I'll have to find a standard torque chart and see what 1/2-13 GR5 is rated.90 sounds high.

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