New Stronger Piston Pin Used In All Twin Model Engines

To drill early 0HV cylinder walls for u-flex oil rings drill hole into return channel 1 3/16" from bottom of cylinder. Use V' drill at 35* angle.

A stronger piston pin (.7915" diameter and oversizes) with thicker wall is now used in all twin model engines. The greater wall thickness, of course, reduces the diameter of hole through pin.

The new pin is now being assembled in all new engines and is also furnished on all parts orders calling for piston pin, or piston with pin.

If you already have piston pin lock ring tool, Part No. 96780-32, which you no doubt have, you will need a new lock ring tapered expander with smaller diameter shaft before tool can be used to install lock ring on new pin. The ring expander you need is available under Part No. 96781-52. Understand, this number covers only the new tapered expander required.

Complete piston pin lock ring tool ordered in the future under Part No. 96780-32 will be supplied with two lock ring tapered expanders - one to fit the earlier piston pin and one to fit the new. We will continue, for some time, to supply with the complete tool the expanding arbor that fits the earlier pin, because of the many engines in service fitted with earlier pin, and because of the earlier pins in dealers stocks.

Pistons and Rings for 1948 O.H.V. Modela

256-48 A Piston with rings and pin-standard eize

High Compression

Note: This piston assembly includes one new oil «ontrol ring and two compression rings.

The above piston supplied in oversizes listed below:

255-UB G

256-US E 25S-U8JA 25b-48KA

22l4l-48 Piston with rings and pin-standard size

Low Compression

Note: This piston assembly is not shown in I9U8 parts book tint ls=ussd on- 194S E (low compression)motors. It includes one new oil control ring and two compression rings.

The above piston supplied in oversizes listed below;

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