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Please torque to me about a B.

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RayMac

08-13-2001 02:03:54




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Can anyone please supply the correct bolt torque values, for crankshaft, big-end, head, flywheel, etc., for a full overhaul, on a 49 B.




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Phil Auten (Tx)

08-13-2001 08:06:36




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 Re: Please torque to me about a B. in reply to RayMac, 08-13-2001 02:03:54  
RayMac,
Here's what you need:

Head bolts - 60 ft./lbs.
Main bolts - 80 ft./lbs.
Rod Cap bolts - 40 ft./lbs.
Flywheel - 50 ft./lbs., then safety wire in pairs.

Tighten head bolts to recommended torque in three steps of 20 ft./lbs. Here is the text of the steps listed in my service manual:
"Use a non-setting type gasket cement on the cylinder head gasket. Tighten cylinder head capscrews evenly starting at center and working towards ends, as numbered on chart. Do not attempt to tighten one entirely, before proceeding to the next. Go over them several times. Tighten to 60 ft./lbs. torsion".
The chart shows #1 in the center of the side opposite the pushrod holes with #2 directly opposite. Standing on the same side as #1, #3 is one to the left of #1 and #4 is one to the right. #5 is one to the right of #2 and #6 is one to the left of #2.#7 is one to the left of #3 and #8 is one to the right of #4. #9 is one to the right of #4 and #10 is one to the left of #6. #11 is opposite #10 and #12 is opposite #9.

It will all make sense if you are looking at the head. Start at #1 and work outward in a spiral pattern.

Phil

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Phil Auten (tx)

08-13-2001 08:13:58




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 Re: Re: Please torque to me about a B. in reply to Phil Auten (Tx), 08-13-2001 08:06:36  
Forgot something.
Be sure to chase all nuts and bolt holes with a tap and all bolts with a die. this will assure clean, dry threads.
After you finish torquing the head, let it sit for at least 12 hours and recheck. If any bolts aren't holding torque, they will need to be replaced.
Recheck the torque after an hour of operation at full operating temp. Then check again after five hours of operation with several cooldown cycles.
If torque holds, you're good to go. If torque does not hold, there's a problem to find.

Phil

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