This guide gives a step-by-step guide to fitting the Nova BSA Goldstar 5 Speed Gearbox

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Mabel Joella Stokes
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MANUFACTURERS OF TRANSMISSION SYSTEMS FOR

2438157 Tel: 01403 711312 Fax: 01403 713207

uk Fitting Guide for Nova BSA Goldstar 5

1 MANUFACTURERS OF TRANSMISSION SYSTEMS FOR RACING AND DEVELOPMENT Unit 12 Star Industrial Estate, Star Road Partridge Green, West Sussex, RH13 8RA, UK. Company Reg: Cardiff VAT NO Registered in England No Tel: Fax: Fitting Guide for Nova BSA Goldstar 5 Speed Gearbox This guide gives a step-by-step guide to fitting the Nova BSA Goldstar 5 Speed Gearbox

2 2 Contents Page Contents Page Number 1. Parts Included in the Nova BSA Goldstar Gearbox 3 2. RRT2 or Standard Version? 4 3. Fitting the cam plate 5 4. Fitting the gearset 6 5. Modifying the inner case Fitting the selector ratchet into the inner case Fitting the gear shifter assembly Finished Nova BSA 5 Speed Gearbox 13 2

3 3 1. Parts Included In the Nova BSA Goldstar Gearbox QTY Part Description Part no 1 BSA Goldstar Mainshaft BSA Goldstar Sleeve Gear Z BSA Goldstar Sleeve Gear Bush BRG Needle 21 x 25 x BSA Goldstar 1 st Mainshaft Z BSA Goldstar 1st Mainshaft Z16 Low BSA Goldstar 2 nd Mainshaft Z BSA Goldstar 3 rd Mainshaft Z BSA Goldstar 4 th Mainshaft Z INA Snap Ring 23.5 x BSA Goldstar Layshaft BSA Goldstar 1 st Layshaft Z26 OR BSA Goldstar 1 st Layshaft Z27 Low BSA Goldstar 2 nd Layshaft Z BSA Goldstar 3 rd Layshaft Z BSA Goldstar 4 th Layshaft Z BSA Goldstar Layshaft Drive Gear Z BSA Goldstar 2/4 Dog Ring BSA Goldstar 1/3 Dog Ring Nova Z15 Splined Washer BSA Goldstar 1st Gear Spacer BSA Goldstar Drive Gear Spacer 0.170" BSA Goldstar Drive Gear Spacer 0.100" Camplate Assembly 1 BSA Goldstar Camplate OR BSA Goldstar Reverse Camplate BSA Goldstar Camplate Drive Gear Z BSA Goldstar Selector Ratchet BSA Goldstar Selector Quadrant Gear BSA Goldstar 4 th Mainshaft Fork BSA Goldstar 2/4 Dog Ring Fork BSA Goldstar 1/3 Dog Ring Fork

4 4 2. RRT2 or Standard Version? The Nova 5 speed gear set is designed to fit directly into the RRT2 BSA gear case with out modification. However the Nova 5 speed gear set will fit standard gearbox cases which have had the following modifications carried out. Note: all modifications refer to the layshaft location a) Bronze bushes replaced with needle roller bearings in both main case, adjacent to the output bearing, and in the sandwich plate. In this case we will supply thrust washers to suit both ends of the layshaft. b) The Bronze bush is retained in the main case. The bronze bush in the sandwich plate being modified by removal of the thrust portion of the bush. Once again a replacement thrust washer is supplied with the gear set. Should you be in doubt as to which version of the BSA gearbox you have, there are a number of differences to look for. A genuine Gold star shell has indexing plunger housings drilled and tapped at both the top and bottom positions, whereas, a standard box only has the bottom position for the plunger housing. Further investigation is still required inside the gearbox as in recent years many shells have been modified in this way. If, on opening the gearbox you find needle bearings, this may not be indicative of a gold star shell, as again, many have been converted. Genuine shells have RRT2 and a number stamped on the sandwich plate adjacent to the moulded on pattern numbers. Once again this could have been added at a later date to give the appearance of authenticity. The final identification is to examine the needle bearing housing in the main shell. A genuine RRT2 has a deep annular machining around the bearing for a steel thrust washer. Whilst it is entirely possible to carry out all these modifications most gear cases will exhibit some standard features. This is particularly true of the thrust face in the main case, we therefore, offer a choice of spacers for this application thick or standard with needle thick. All gear sets are supplied with a thrust washer suitable for the sandwich plate end of the layshaft. Modified as previously stated in (b). It is suggested that new bearings, oil seal for sleeve gear, and gaskets be used when reassembling. If using a standard case the bronze bushes supporting the layshaft can be replaced with needle bearings as in the RRT2 case. 4

5 3. Fitting the cam plate A. The following guide will show fitting a standard cam plate.

refer to note at the bottom of section 6). B.

To start strip out the original gearset, cam plate, selector forks and selector quadrant.

Screw the standard BSA indexing adjuster into the case.

5 5 3. Fitting the cam plate A. The following guide will show fitting a standard cam plate. The same applies for the reverse camplate apart from when fitting the sandwich plate, refer to note at the bottom of section 6). B. Locate the Nova cam plate onto the boss as shown above. To start strip out the original gearset, cam plate, selector forks and selector quadrant. C. Line up the threaded hole in the case with an indent in the cam plate. D. Screw the standard BSA indexing adjuster into the case. Rotate the cam plate so the indexer sits in the neutral position. In the picture above the cam plate is sitting in 1 st gear, so it needs to be rotated anticlockwise so it sits in the small groove highlighted. 5

! Please don t do this to your own case. Locate the sleeve gear into the case bearing.

Ensure the three needle bearings are located inside the sleeve gear. 1 2 3 C.

Fork (marked 2 4 ) 3: Top Fork (marked T ) D.

6 6 4. Fitting the gearset A. The top of our case has been removed for illustrative purposes only!! Please don t do this to your own case. Locate the sleeve gear into the case bearing. It is recommended that the bearing and oil seal are replaced before reassembling. B. Ensure the three needle bearings are located inside the sleeve gear C. The selector forks supplied are as follows: 1: 1 st /3 rd Fork (marked 1 3 ) 2: 2 nd /4 th Fork (marked 2 4 ) 3: Top Fork (marked T ) D. Remove 4 th gear from the mainshaft and locate the Top selector fork into the groove in the gear. Align the 4 th gear up against and concentrically with the sleeve gear. In this position the pin on the fork should locate easily into the back groove of the cam plate. 6

7 E. Locate the standard BSA fork spindle into the case and push through the Top fork

The layshaft will arrive as shown above.

standard version. H. Take note that both the 0.170 & the 0.

Only use one of these depending on your shell type.

7 7 E. Locate the standard BSA fork spindle into the case and push through the Top fork you just installed. F. This is how the assembly should look so far. G. The layshaft will arrive as shown above. Refer back to page 4 for details on identifying whether you engine is the RRT2 or standard version. H. Take note that both the & the spacer will be located on the shaft. Only use one of these depending on your shell type. Due to variation in the gearbox shells, it may be necessary to reduce the thickness of the washer to give end float. The washer is hardened so material should be removed by either surface grinding or by using a suitable turning tip on a lathe. 7

8 I. Locate the layshaft into the case with the

NOTE: Do not load the 1 st mainshaft gear yet. J.

th dog ring on the shaft and allow the fork pin to

Push the fork spindle through further until it passes

8 8 I. Locate the layshaft into the case with the relevant spacer. NOTE: Do not load the 1 st mainshaft gear yet. J. Locate the 2 nd /4 th selector fork into the 2 nd /4 th dog ring on the shaft and allow the fork pin to sit into the inner groove in the cam plate. K. Push the fork spindle through further until it passes through the 2 nd /4 th selector fork securing it in place. L. This is how the assembly should look so far. 8

9 M. Fit the final fork into the 1 st /3 rd dog ring, and locate the fork pin in the outer

Tighten the standard BSA fork spindle retaining screw (highlighted above) to hold the fork

The remainder of the gears on the mainshaft are retained by retaining clips.

The splines on the shaft will have to line up with the splines on each gear.

9 9 M. Fit the final fork into the 1 st /3 rd dog ring, and locate the fork pin in the outer groove of the cam plate. Push the fork spindle right in so all three forks are located. N. Tighten the standard BSA fork spindle retaining screw (highlighted above) to hold the fork spindle in place. O. The remainder of the gears on the mainshaft are retained by retaining clips. Locate the mainshaft through the gears already assembled into the gearbox. The splines on the shaft will have to line up with the splines on each gear. NOTE: Do not push too far through as it will jam in the sleeve gear. P. Locate the 1 st layshaft gear in place so it meshes with the 1 st mainshaft gear. Then fit the 1 st gear spacer up against the 1 st gear as shown. 9

10 10 5. Modifying the inner case Hatched areas highlighted in the inner case below need to be opened out to allow clearance for the Nova selector ratchet. Gearbox inner cover 1 NOTE: Do not remove all the material around the selector rod (area 1) or there would be no support for the fork spindle. 10

11 6. Fitting the selector ratchet into the inner case Removing original BSA selector ratchet A. To remove selector quadrant it is necessary to remove the locating dowel directly beneath it. B. After removal this will reveal the spindle on which the quadrant pivots.

11 11 6. Fitting the selector ratchet into the inner case Removing original BSA selector ratchet A. To remove selector quadrant it is necessary to remove the locating dowel directly beneath it. B. After removal this will reveal the spindle on which the quadrant pivots. C. The internally threaded spindle can be withdrawn using one of the outer cover bolts as an extractor. Fitting new Nova BSA 5 speed selector ratchet A. Locate the Nova ratchet plate in place using the threaded spindle. B. Insert the locating dowel back in place. NOTE: For the standard camplate ensure the camplate is now in the 1 st gear position. For the reverse camplate ensure the camplate is now in the 5 th gear position. Replace the gasket and fit the inner cover in place. 11

12 7. Fitting the gear shifter assembly A.

As mentioned above the gearbox should be in 1 st if fitting the standard plate and 5 th if fitting the

The cutouts in the case above are for illustrative purposes only! C.

Install spacer and kickstart gear assembly on mainshaft and lock with nut and tab washer.

12 12 7. Fitting the gear shifter assembly A. At this point the selector quadrant should be identified with one tooth of the ratchet plate being visible. As mentioned above the gearbox should be in 1 st if fitting the standard plate and 5 th if fitting the reverse plate. B. The outer cover and selector indexing arm are retained from the standard BSA gearbox. The cutouts in the case above are for illustrative purposes only! C. Fit the selector indexing arm into the cover as shown. Install spacer and kickstart gear assembly on mainshaft and lock with nut and tab washer. Install kickstart quadrant and RRT2 type speedo drive. D. Secure the cover in place with the standard BSA nuts. Fit the gear lever and test operation. The indexing plunger requires adjusting to give smooth gear changes. Adjust as necessary and lock in position when satisfied. 12

13 8. Finished Nova BSA Goldstar 5 Speed Gearbox If you have any problems when fitting your gearbox don t hesitate to contact us on 01403

13 13 8. Finished Nova BSA Goldstar 5 Speed Gearbox If you have any problems when fitting your gearbox don t hesitate to contact us on or us at sales@novaracing.co.uk For information on any other Nova products please check out our website at 13

NOVARACING TRANSMISSIONS LTD

NOVARACING TRANSMISSIONS LTD MANUFACTURERS OF 6 PINNACLE CLOSE, PHOENIX LANE TRANSMISSION SYSTEMS CROWLAND, LINCS, PE6 OGB,UK. FOR RACING AND Company Reg: 2438157 Cardiff DEVELOPMENT VAT NO. 550-6594-34