From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Instructions for checking the MainSwitch and setting the distributor on a 6-cylinder engine.
| Identifier | ExFiles\Box 168a\4\ img174 | |
| Date | 15th May 1940 | |
| -3- -cont'd- MainSwitch. Check all connections for tightness. This is very important. (3) Distributor. (Photo required) The distributor on the 6-cylinder engine has a 3-lobed cam and twin contact breaker. The two contact arms form parallel circuits for the ignition current, and the circuit through the coil is not broken until both sets of contact points are open. One half of the cylinders are fired by each set of points. The points must open 60 cam degrees apart. If the points do not open at this interval, one half of the cylinders will have a different ignition timing from the other half. To get this very important adjustment, the following instructions must be carefully carried out:- The contact point opening of the stationary breaker arm A should be set first and then the synchronism completed by adjustment to the movable set of points (arm D). Turn the distributor shaft till the rubbing block of breaker arm A is on a lobe of the cam. Loosen screw B and turn screw C to get a contact opening of from .019 inches to .021 inches. Tighten screw B. Turn shaft again till the rubbing block of breaker arm D is on the lobe of the cam. Loosen screw E, and turn screw F till the contact opening is from .019 inches to .021 inches. Tighten screw E.{Mr Elliott - Chief Engineer} Now place synchronising tool on the cam with the M side of the spring in the cam slot, then turn cam in the direction of rotation till the graduations on the M side of the tool are near the slot in the rim of the distributor base. Continue to turn the cam till the breaker arm A breaks contact and note graduation on the tool that aligns with the approaching edge of the slot. Again turn cam in the same direction till the same graduation on the M side aligns with the same edge. Loosen screw G and H and turn screw J till breaker arm D just breaks contact. Check this by rotating cam again. Tighten screws G and H, also check contact opening of lever D and if this is outside the limits, reset the point opening and synchronize arms again, -cont'd- | ||