Repair Manual Question - Engine Torque Values

[Robert Crandall]

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!

[geezer#99]

Like this.
From my 1976 motors manual.
Sorry about it being sideways.

[Robert Crandall]

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!

[geezer#99]

Try again

[Robert Crandall]

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.

[geezer#99]

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.

[Robert Crandall]

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.

[MJN]

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.

[Robert Crandall]

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.

[MJN]

Originally Posted by Robert Crandall

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.

Its not all about the fastener size, take into account the gasket material and where on the engine its used as well. The timing cover uses a paper gasket where rocker covers or oil pan used cork gaskets. The cork gaskets would have a lesser torque value to avoid crushing the gasket even with a 5/16 fastener.

[Robert Crandall]

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.