October 17, 1961
Bulletin No. SB-869
Pistons & Rods
SUBJECT: Termination of service on piston and connecting rod kit
assemblies - less rings:
10 h.p. models QD & QDL-10 thru 21S.
On October 1, 1961, service was discontinued on knocked-down piston and connecting rod kit assemblies 378393 (std.), 378500 (.020 o.s.), and 378501 (.040 o.s.). These special kits were made available at a special price primarily for servicing the one- year-old QD-21 series engines to eliminate any possibility of failure due to wrist pins loosening, particularly in heavy duty application. With the discontinuance of these kits, future rod, piston and wrist pin service will be considered as being required because of normal engine service.
Changes were necessarily made to pistons, connecting rods and wrist pins as a result of having changed to wrist pin needle bearings in 1961. All of these new parts can be serviced in all 10 h.p. engines back through the model QD-10 series. However, because the subject engines originally used wrist pin bushings, all the new parts must be installed in making the initial change to the wrist pin needle bearing. Thereafter, any one of the new parts may be installed as required.
The detail parts must be individually ordered from the Parts Distributor after his stock of kits is exhausted. The 1962 master Parts Price List will also contain the following basic information.
STANDARD SIZE:
Order per cyl. 2 302577 Lockring
1 307849 Wrist pin
1 378251 Needle bearing - wrist pin
1 378285 Piston
1 378330 Connecting rod
1 378416 Piston ring set
Above parts supersede:
375595 Conn. rod 375668 Piston & rod assy. - upper
376223 Conn. rod 375730 Piston & rod assy. - lower
377044 Conn. rod 376224 Piston & rod assy. - upper
375591 Piston - std. 376226 Piston & rod assy. - lower
376202 Piston - std. 377042 Piston & rod assy. - upper
377031 Piston - std. 377043 Piston & rod assy. - lower
377032 Piston & wrist 378393 Piston & rod kit
pin
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(over)