686 310-DTorque Specs

Anonymous-0 · May 11, 2011

Anyone have the head and connecting rod torque specs for a 686 with a 310? Thanks in advance.

pete 23 · May 11, 2011

Those engines used several different style and grades of cap screws and studs so hard to give a specific torque as my service manual doesn't tell which ones were used on what models and they could have had different ones used over the years.

Allan in NE · May 12, 2011

Doesn't matter what you're working on; torque specs are torque specs.

Look in the front of ANY manual and they usually will give the torques for a litney of bolt sizes, grades and thread pitches.

Allan

pete 23 · May 12, 2011

Except for necked bolts like the german engine, metric bolts. Lot of difference from the std torque chart.

JimB2 · May 12, 2011

Hi Stiggie, according to my I&T Shop Service Manual for 686 with D-310:
Main Bearing torque specs:
Marked 10K or 10-9 ... 80 ft-lbs
Marked 12K or 12-9 ... 97 ft-lbs
Marked 12.9 ... 140 ft-lbs
Balance weight bolt... 57 ft-lbs
Rod bolts ...... 63 ft-lbs

Head cap screws:
1st torque ... 50 ft-lbs
2nd torque ... 70 ft-lbs
3rd torque ... 90 ft-lbs
Usual pattern starting from center of head working outward in both directions.

Hope this helps
JimB

Anonymous-0 · May 16, 2011

Thanks for all the help on this. Much appreciated.

686 310-DTorque Specs

Anonymous-0

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pete 23

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Allan in NE

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pete 23

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JimB2

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Anonymous-0

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