TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
Page 317 of 670
TM9-2815-202-34 (27) Adjust bridges as follows: CAUTION Do not loosen or tighten locknut with bridge installed in cylinder head. Bent bridge guide or rear valve stem may result. (a) (b) (c) (d) (e) (f) Place valve bridge (17) in a vise or bridge holding fixture and loosen locknut (103)on bridge adjusting screw (104). Install valve bridge (17) on valve bridge guide (18). While firmly pressing straight down on pallet surface of valve bridge (17), turn adjusting screw (104) clockwise until it just touches valve stem. Then turn screw an additional 1/8 to 1/4 turn and tighten locknut (103) finger tight. Remove valve bridge (17) and place in a vise or holding fixture. Hold adjustment screw (104) from turning with screwdriver and torque locknut (103) on adjustment screw to 20-25 Ib-ft (27-34 N-m). Lubricate valve bridge (17) and valve bridge guide (18) with engine oil and install bridge in original position. Place 0.0015 inch feeler gage under each end of valve bridge (17). When pressing down on pallet surface of valve bridge, both gages must be tight. If both feeler gages are not tight, readjust screw as outlined in steps (a) thru (e). 4-211