Re: '38 six cyl question

Posted by DavidPackard On 2019/7/14 12:14:06

Toymanbob;

I've checked several 'Motor's Manuals' and found the six cylinder engine should have 3/8 - 24 rod bolts torqued to 45-46 ftlbs.

The plot thickens a bit for later eight cylinder engines with 7/16 - 28 rod bolts that have a torque specification of 60-65 ftlbs. Those engine used 'all metal self-locking' nuts that have a rather high running torque that might explain the higher than expected torque.

I'll defer to others on the subject of whether the 110 & 120 models used self-locking rod bolt nuts. The industry that I worked in considered self-locking nuts as a 'one-time' use item. There is also a precautionary note in the '54 Packard shop manual to reject rod nuts that have lost the self-locking feature.

Dp