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07-22-2024, 08:06 PM | #1 |
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Repair Manual Question - Engine Torque Values
I work from a 1977 Chevrolet Light Duty Repair Manual. Every section shows a page for Specifications. These pages give torque values.
I cannot find torque values for the engine section. A page for Specifications are not shown in any of the 3 indexes (main, 6cyl, 8cyl). The last page of the engine section is Specifications for engine measurements, but no torque values are shown. I am certain that it is reader error on my part, but can anyone guide me to where the torque values for engines are shown? Thanks! |
07-23-2024, 10:08 AM | #2 |
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Re: Repair Manual Question - Engine Torque Values
Like this.
From my 1976 motors manual. Sorry about it being sideways. |
07-23-2024, 10:58 AM | #3 |
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Re: Repair Manual Question - Engine Torque Values
Thank you for your help. I find it hard to read, and I am not at first able to print it in a form that I can read, but I will work on that.
Again, thanks! |
07-23-2024, 11:09 AM | #4 |
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Re: Repair Manual Question - Engine Torque Values
Try again
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07-23-2024, 01:46 PM | #5 |
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Re: Repair Manual Question - Engine Torque Values
Thank you! That copy is readable, and the print screen is also. I added the page to my book.
I am tightening valve cover and oil pan bolts. I found somewhere on this forum 80 inch lbs for the 1/4 inch bolts and 165 inch lbs for the 5/16 inch bolts. I wanted to see what the book showed, but I cannot find those values in my book. I could not make myself get them that tight, so I chose 50 and 75. Those values are far tighter than I have ever gotten them. So far, the puddling seems to have stopped. |
07-23-2024, 01:53 PM | #6 |
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Re: Repair Manual Question - Engine Torque Values
I’ve always gone by feel. Never got lucky trying to torque them.
What type of gasket? Cork, cork/rubber, rubber etc are different kinds. |
07-23-2024, 05:04 PM | #7 |
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Re: Repair Manual Question - Engine Torque Values
Cork. I always used to do the same. I never wanted to take a chance of mashing the gaskets or de-forming the sheet metal flanges, so I believe I was too easy on the tightening. I always had leaks. Now they are a lot tighter than I ever put them. I used the torque wrench to make sure that I tightened each one the same.
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07-24-2024, 10:55 AM | #8 |
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Re: Repair Manual Question - Engine Torque Values
Here is the spec page from the 1976 truck service manual, http://www.73-87chevytrucks.com/tech...Supplement.pdf
I did look at the 1977 manual and it is strange there is no mechanical torque specs for the engine listed. Either way, hope this helps. I would be sure to read the specs posted above closely- showing 50 FT LBS for rocker arm cover bolts- those little 1/4-20 bolts would never survive that or a cork gasket. I see the little note next to the torque value but cannot read what it refers to.
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com Last edited by MJN; 07-24-2024 at 11:01 AM. |
07-26-2024, 07:23 PM | #9 |
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Re: Repair Manual Question - Engine Torque Values
Thank you very much for this and also for the link. I printed the page for my book.
I found somewhere on this forum 80 in lb for the 1/4 inch bolts and 165 inch lb for the 5/16. This new page shows the same 80 in lb for the 1/4 inch, but shows 75 in lb for the 5/16. Less than the 1/4 for the 5/16 does not seem logical. I chose 50 for the 1/4 and 75 for the 5/16. |
07-29-2024, 09:35 AM | #10 | |
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Re: Repair Manual Question - Engine Torque Values
Quote:
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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07-30-2024, 11:12 PM | #11 |
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Re: Repair Manual Question - Engine Torque Values
Thank you for your clarification of this. Lucky for me, the 50 that I chose for the main oil pan bolts does not exceed the specification, and the 75 that I chose for the end bolts match what is required.
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