86K1504 NUT/BOLT.  Locking screw nut for the camshaft on Leyland 4/98 and Leyland 6/98 engines in Leyland Marshall tractors, JCB machinery, Thornycroft marine engines and Leyland trucks.

Also drives the Tacho Angle Drive 83H1004.

See item number 2 in the illustration.

Fitted to engines:

Leyland 4/98DT engine number 7228 onwards
Leyland 4/98NT engine number 36425 onwards
Leyland 4/98TT Turbo engines
Leyland 6/98DT engine number 331 onwards
Leyland 6/98NT engine number 662 onwards
Leyland 6/98TT Turbo engines

Fitted to:

• Leyland – 262, 272, 462, 472, 282, 482, 602, 604, 702, 704, 802, 804
• Leyland – 285, 2100, 485, 4100
• Marshall – 602, 604, 702, 704, 802, 804, 904XL
• Marshall 100, 115, 125, 145
• JCB –  3C Mk3, 2D, 4D
• Thornycroft T230, T345 Marine engines
• Trucks of the same era