Torquing Bolts, How accurate is the book??

[1batt4u]

Hi all,

I remember in the old forum at least, people mentioning that a few of the torque spec weren't right???

I am putting everything together on the engine! Valve covers, timing covers have been on but havent tighten them yet, water pump unit(back cover and top part) 2 water necks, intake unit, fuel mixture unit, all fuel bolts, spark plugs!

If possibl and easy to give me the torque specs, or at least tell me which ones are worng in the book and what is the correct torque!

Thank you!

[mluder]

I'm in the process of doing the same thing. Last night I re-installed my timing chain cover and valve covers.

The book says the timing chain cover fixing bolts get 11 ft/lbs. which is what I used. (i'm not saying that's correct, just what I did)
I couldn't find a number for the valve covers so I used 11 ft/lbs. here as well.

I'll keep watching this thread - I had no idea that some of the manual numbers are suspect.

Cheers.
Steve

[1batt4u]

I was always curious, is every same size bolt the same torque, for example 7mm bolt torque at 11 ft/lbs, and every 8mm bolt same torque, and every 6mm bolt same torque, ect.......

I assume Fuel bolts, since they are hollow, the torque is less?

[David T]

Use the torque specs in Service Bulletin St-09-7/81. You must use clean, dry threads with nothing applied (no oil, threadlocker etc). The torque wrench is supposed to be accurate and calibrated.
David Teitelbaum

[1batt4u]

Use the torque specs in Service Bulletin St-09-7/81. You must use clean, dry threads with nothing applied (no oil, threadlocker etc). The torque wrench is supposed to be accurate and calibrated. David Teitelbaum

I put anti-seize on the bolts as everyone said to. I know the torque changes to lower. How much lower than what it is supposed to be?

[Nicholas R]

Technically for a lubed torque its usually between 3-5ftlbs less than a dry torque, though I wouldn't worry too much. The torque specs shouldn't be high enough to tear threads out. Definitely put anti-seize on your bolts, especially if you're using SS hardware. The galvanic corrosion potential is greater between SS and aluminum than zinc/carbon steel and aluminum. Either way, the anti-seize will keep corrosion down and ensure future removal :D

[1batt4u]

Technically for a lubed torque its usually between 3-5ftlbs less than a dry torque, though I wouldn't worry too much. The torque specs shouldn't be high enough to tear threads out. Definitely put anti-seize on your bolts, especially if you're using SS hardware. The galvanic corrosion potential is greater between SS and aluminum than zinc/carbon steel and aluminum. Either way, the anti-seize will keep corrosion down and ensure future removal :D

Thanks for the info!!!! :)

[DMC5180]

D:02:01

Item 10. Fuel line torque values. M12 Bolt & M14 Bolt values were incorrectly printed.

THEY SHOULD READ:

M12 Bolt 15-20 Nm (11-14 FT LB)
M14 Bolt 20-24 Nm (14-17 FT LB)

[Nicholas R]

D:02:01

Item 10. Fuel line torque values. M12 Bolt & M14 Bolt values were incorrectly printed.

THEY SHOULD READ:

M12 Bolt 15-20 Nm (11-14 FT LB)
M14 Bolt 20-24 Nm (14-17 FT LB)

Does it actually call them out as M12 and M14 bolts??? I know they're banjo bolts and all but that totally goes against the metric hardware naming convention; naming the bolt by the size of the head instead of the diameter of the body.

Pretty sure the only places on the DeLorean where you'll find M12 hardware; trailing arm bolts, lug nuts and upper and lower control arm hardware, and they're all going to require a lot more than 14 ftlbs, lol.

(obviously I have not read this section so I am certainly curious)

[DMC5180]

Does it actually call them out as M12 and M14 bolts??? I know they're banjo bolts and all but that totally goes against the metric hardware naming convention; naming the bolt by the size of the head instead of the diameter of the body.

Pretty sure the only places on the DeLorean where you'll find M12 hardware; trailing arm bolts, lug nuts and upper and lower control arm hardware, and they're all going to require a lot more than 14 ftlbs, lol.

(obviously I have not read this section so I am certainly curious)


Yes, There are also values for Nuts. When they say "Fuel lines" they are referring to the Banjo bolts or Dome nuts. It tried to Copy that chart into my post but it did not work. But If you go to the page I referred to you will see what I was talking about. Just look at the WSM in the resources section (First Sticky). The M12 hardware is on the fuel filter, Supply & Return line connections on the FD and FP outlet fitting (Bolt or Nut) depending on the pump style. I'm not aware of any M14 though.

[1batt4u]

When the book writes, example Torque M7 bolt 7-11 ft Lbs, Why doesn't it just write 11 ft lbs, and it writes torque anywhere between 7-11 ft lbs??

[1batt4u]

I wrote it the other way around, supposed to be "lbs. ft."

[1batt4u]

Anyone??

[Bitsyncmaster]

It shows a range to account for the accuracy of your tools. If it said 9 ft/lb. Do you need that value within .5 % or 20%?

[Ron]

Yep. And because it is not all that critical... The ideal torque is probably 9 ft-lb with 2ft-lb higher or lower being acceptable, so they say "7-11ft-lb", or, equally say 9ft-lb(±)2. OR, ideal could be 9.5ft-lb with 1.5ft-lb allowed...Note how awkward 9.5ft-lb(±)1.5 looks. It's just convention.

[1batt4u]

Ok, thank you all for the info!!! Just checking want to be sure!!

I do have a torque wrench, it is the big size, 1/2" It goes from 20 ft. lbs. to 160 ft. lbs. I went under those numbers trying to get 11 ft. lbs. but it doesn't seem as it would start clicking to indicate anything. I guess I need a small size torque wrench with lower numbers??

[Bitsyncmaster]

Ok, thank you all for the info!!! Just checking want to be sure!!

I do have a torque wrench, it is the big size, 1/2" It goes from 20 ft. lbs. to 160 ft. lbs. I went under those numbers trying to get 11 ft. lbs. but it doesn't seem as it would start clicking to indicate anything. I guess I need a small size torque wrench with lower numbers??

You need to get a 3/8" drive or smaller for 11 ft/lb.
You need to get a 1/4" drive torque wrench for hose clamps which are 40 inch/lb.

Sometimes I will use the high value that is listed. Like spark plugs I use 15 ft/lbs and even that seems not enough.

[1batt4u]

You need to get a 3/8" drive or smaller for 11 ft/lb.
You need to get a 1/4" drive torque wrench for hose clamps which are 40 inch/lb.

Sometimes I will use the high value that is listed. Like spark plugs I use 15 ft/lbs and even that seems not enough.

Thank you for all the info!! I really appreciate it!!! :-)