Model 30/40 Main Bearing Securing Plate

Product no.: 0285 A11/34
£18.00
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3 screw mainshaft bearing securing plate, to fit all Model 30 and Model 40 International (and CS1/CJ) engines. This pressed steel plate was used to retain the main bearings and ensure they did not 'walk' under heavy use.

The plate was secured by 3 screws (sold seperately), which were soldered to the plate after tightening, to ensure they do not come lose. This plate is copied from an original item.

Note: this plate fits all International crankcases after approximately 1932. before that time a shallower plate was used. If you are not sure - measure the lip of the main bearing housing ( see second photo), if it sits approx. 0.225" above the crankcase wall it is for this plate. If it measures approximately 0.175" above crankcase - then the very early securing plate is required (see Item no 0287). The late type crankcase is on the left in the 3rd photo

Hints for Securing The Screws On These Plates:

Original SOHC engines used slotted, unplated screws (which we supply - Item 0023 and 0024), so they could be soldered in place to stop them unscrewing when the engine was running.  It is important to ensure you use unplated screws, as the solder will not adhere to plated screws.   Once bearings are fitted, the plates can then be held in place and the screws tightened up with a flat bladed screwdriver.  Then, originally, these screws were soldered over - ensuring the solder flows easily  over the head and surrounding plate (without too much spillage).  To do this requires that both the corners of the plate and the heads of the screws are absolutely clean and free from oil.  I also tend to use a rotary  wire brush on both to remove any surface corrosion, just before soldering.  Originally I believe plumbers solder would have been used (not electrical solder), but a good quality solder and flux is required to get a good finish.  It is then a case of simplly getting enough heat onto the area surrounding the screw hole of the bearing retainer plate and the head of the screw, until the solder flows freely of its own accord - which can sometimes be quite difficult. 

I will not advise anyone how to do this - that is for each owner to decide for themselves, but many soldering irons cannot convey enough heat to get the solder flowing, so a number of people use small gas blowlamps, with well localised flames - but great care should be taken if doing it this method to avoid rags or anything close igniting.

A picture is also attached of an original engine with International type bearing retainer plate fitted, and screws soldered over

 

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